Possibilities for converting conventional cattle production to the organic model in the Grijalva River Basin, Mexico

The possibilities for converting conventional cattle production to the organic model were evaluated in the Grijalva River Basin, Mexico, and possible interventions were identified. A multi-criteria organic livestock conversion index (OLCI) with 10 indicators comprising 35 variables was used. Information was obtained through participatory workshops, direct observation, and interviews to 91 farmers of 11 different communities in the municipalities of Mazapa de Madero (n = 17), Huitiupán (n = 30), and Tacotalpa (n = 44). Results show higher OLCI values in Mazapa (56.8%) and Tacotalpa (56.7%) than in Huitiupán (49.0%). The production units evaluated show: (i) limitations with respect to indicators ecological weed control in pastures and crops, veterinary prevention and treatment, food safety, and ecological management, and (ii) strengths to reach the organic standards are: feed management, sustainable pasture management, soil fertilization, ecological pest and disease control in pastures and crops, breeds and reproduction, and animal wellbeing. In order to revert the future scenario of conventional livestock production and to transition to organic cattle raising, it is necessary to: (1) train and advice farmers regarding ecological production techniques and management, principally with respect to the limitations pointed out, and (2) implement a policy for development of livestock raising with specific functional and structural changes. *Corresponding author: J. Nahed, Department of Agroecology, El Colegio de La Frontera Sur, San Cristobal de Las Casas, Chiapas, Mexico E-mail: jnahed@ecosur.mx

J. Nahed is a specialist in animal production systems; Nahed has participated in several scientific meetings, and he has taught undergraduate and graduate courses and published several articles in national and international journals on issues related to animal production systems, agricultural production systems, silvopastoral systems and organic farming. He is a National Researcher Level II in the National Research System of Mexico's National Council on Science and Technology (CONACYT according to its Spanish initials), and is an honorary member of the State System of Researchers in Chiapas, Mexico.

PUBLIC INTEREST STATEMENT
In this research, the opportunities and limitations for converting conventional cattle production to the organic model in the Grijalva River Basin, Mexico, were evaluated. The purpose of the research has a wider societal relevance for the farmers of the three communities studied, because conventional livestock production is an important activity in the zone and has a great potential for converting to the organic model.
The research began by the interest in the topic of a group of farmers, which were supported by several researchers of our team. To conduct the research, an intense field work with farmers was carried out, and eventually got to know the main aspects of conventional livestock that favor or limit its transformation to the organic model, in addition to its approximation to this model. The hope of our research team is that farmers in this zone achieve the development of organic livestock production.

Introduction
Currently, organic agriculture is becoming increasingly important worldwide due to a growing demand for healthy, safe, responsibly produced food (Pimentel, Hepperly, Hanson, Douds, & Seidel, 2005;Pingali & Raney, 2005). This type of agriculture is based on ethical, holistic principles of health, environmental conservation, equity, precaution, and responsibility (International Federation of Organic Agriculture Movements (IFOAM), 2005). In this context, organic livestock raising production systems are based on grazing, which although is not mandatory in the regulations is desirable and advisable, thus closing the soil-plant-animal cycle in a natural, integrated manner. These production systems conserve ecosystems and their biodiversity, promote animal welfare, avoid use of chemically synthesized substances, and offer consumers food with a high nutritional and hygienic-sanitary quality (IFOAM, 2009).
Organic certification could be one of the competitiveness keys in order to market agricultural products (Stofferahn, 2009) because it allows for more market options and better prices by virtue of its quality (von Borell & Sørensen, 2004) and with a proper trade channel. This type of livestock raising promotes clean production as it restricts or prohibits use of toxic agrochemicals; contributes to maximizing interactions among crop agriculture, livestock, silviculture, and the physical environment; maximizes land productivity, efficiently managing the biological principles of animal and plant production; and promotes congruence between use and conservation of natural resources (Gutteridge, 1991). Furthermore, it provides environmental services (Dagang & Nair, 2003;Steinfeld, 2002) such as water catchment and filtration, mitigation of climate change effects, generation of oxygen and assimilation of contaminants, biodiversity protection, soil retention, refuge for wild fauna, and scenic beauty (Comisión Nacional Forestal (CONAFOR), 2012). Furthermore, organic livestock raising with silvopastoral management more greatly reduces enteric methane emissions as compared to pastoral systems because the foliage of fodder tree species is more digestible than grasses (Blaxter & Clapperton, 1965;McCrabb, 2002).
In order to guarantee consumers and certifying agencies that products are authentically organic, there is a need for clear, concise, precise indicators based on ethical and technical principles of this type of agriculture (IFOAM, 2009;Kouba, 2003). Various studies report indicators for evaluating sustainability of agricultural production (Coffey, Reynolds, & Hale, 2004;Galan, Peschard, & Boizard, 2007;Nahed, Castel, Mena, & Caravaca, 2006;Peacock & Sherman, 2010), animal well-being (Napolitano, De Rosa, Ferrante, Grasso, & Braghieri, 2009;Phythian et al., 2011), and environmental effects on milk quality in organic farms (de Boer, 2003;Müller-Lindenlauf, Deittert, & Köpke, 2010;Nauta, Baars, & Bovenhuis, 2006;Rozzi, Miglior, & Hand, 2007). Some of them assess technical and economic behaviors in biological breeding or rearing (Benoit & Laignel, 2009) and farmer attitudes toward conversion of their conventional systems to organics (Midmore et al., 2001), while others criticize organic production because animals are often underfed or infested with parasites due to restrictions on the use of antihelminthic medicines (Vaarst, Padel, Hovi, Younie, & Sundrum, 2005). However, few studies (e.g. Lamine & Bellon, 2009;Mena et al., 2012;Nahed et al., 2009;Olivares, Gómez, & Meraz, 2005) address the use of indicators to evaluate the transition from conventional to organic systems. These four studies allow for orienting agricultural research and development efforts toward organic conversion and recognizing limitations, potentials, and opportunities of existing livestock systems to design strategies for planned functional and structural intervention (Scoones, 1998). Functional impediments may be overcome by substituting one factor of production with another, for example, chemical fertilizers with organic ones, or chemical pest control with biological control. Structural limitations, on the other hand, are a product of the existing social relationships, which are not easy to modify; rather their transformation depends on multiple changes in the social structure in order for social and political processes to evolve (Long & Villarreal, 1993).
From this perspective, two scenarios of evolution of livestock systems may be defined (Mojica, 1991). One is the probable scenario, which would be the result of allowing those prevalent tendencies in conventional cattle production and their environment to continue their current trajectory. The other is the desirable scenario, which is the result of a planned intervention that would modify the current tendencies, moving toward organics, so that the processes undergo significant changes in order to overcome the probable scenario mentioned above. The point of departure for plans responding to both scenarios is the current situation or base line of a given farm (Scoones, 1998).
In southeast Mexico, particularly in the Grijalva cross-border River Basin (Nahed et al., 2010), conventional cattle raising is generally characterized by varying levels of use of local and external inputs. Such systems are based on extensive grazing with varying extents of tree cover and histories of use, interdependence with crop associations for production of basic crops (principally maize and beans), rotation in land use, and use of foliage of fodder trees and shrubs from forested areas as animal feed. The low level of technological development and capital investment is principally evidenced by the following aspects: (i) use of family labor, (ii) precarious infrastructure, (iii) manual means of labor, (iv) basic infrastructure (roads, electricity, water), (v) lack of advisory and training, and (vi) a low level of integration among production, transformation, and marketing.
Based on these aspects, the objective of the present study was: (i) to evaluate the level of approximation of conventional cattle production units (CPU) to the organic model in communities of the upper and middle regions of the Grijalva River Basin, Mexico; and (ii) to identify the limitations and potentials as well as the functional and structural interventions (corrective management measures) necessary for moving the CPU toward organic certification and sustainable development.

Location and characteristic of the study site
The Grijalva River Basin has a total area of 56,895 km 2 , of which 9.5% are in Guatemala and 90.5% in the Mexican states of Chiapas, Oaxaca, and Tabasco (García, 2010). This basin includes three portions or regions: the upper, middle, and lower portions. The upper section is principally located in Guatemala and annually provides 2.4 km 3 of surface water to the Grijalva River (also known as the Rio Grande de Chiapa); the mid-section lies in the Mexican states of Chiapas, Oaxaca, and part of Tabasco State, and the lower section and the outlet to the sea in the state of Tabasco.
The chemical quality of the soil in over half the watershed has been degraded, negatively affecting its fertility (Colegio de Postgraduados [COLPOS], 2002) and in turn rural development and social processes; García-Barrios et al. (2009) have documented this phenomenon in another region of Chiapas.
The Grijalva River Basin includes 15,144 localities (86.9% in Mexico and 13.1% in Guatemala) with 4,804,794 inhabitants (82.1% Mexican and 17.9% Guatemalan). Due to the diversity of climates, soils, vegetation, and agricultural systems, and the cultural diversity of the indigenous and mestizo populations in this vast territory, management of the river basin is certainly complex. As a contribution to such management, this paper addresses a strategy for intervention in management of sustainable livestock systems in two micro-watersheds located in the upper and middle regions of the Grijalva River Basin (García, 2010).

Obtaining of information
Information was obtained through participatory workshops, direct observation in the cattle production units, and a semi-structured interview with cooperating farmers (Gillham, 2005). The farms number selection was based on the willingness of the farmers to participate in the study, and in all cases the number of farmers interviewed exceeded 30% of all producers in each municipality studied.
In the upper part of the Grijlava Watershed, 17 farmers from the municipality of Mazapa de Madero (MA), Chiapas State were interviewed: 3 from Colonia Horizonte, 3 from Libertad Frontera, and 11 from the community of Mazapa. In the middle region 74 farmers were interviewed: 30 from the municipality of Huitiupán (HU), Chiapas (10 from Cubilete, 10 from Buen Paso, and 10 from Remolino), and 44 from the municipality of Tacotalpa (TA), Tabasco State (15 from Oxolotan, 5 from Tomas Garrido, 7 from La Pila, 7 from La Cumbre, and 10 from Cuviac).

Design of the methodology for evaluation
Based on organic standards (Council of The European Union, 2007; IFOAM, 2009), variables and fundamental indicators were defined in order to design a simple methodological approach which would allow for evaluating the approximation of conventional cattle production units to the organic model. In this manner, the OLCI was constructed with 10 indicators comprising 35 variables (Table 1).
In our case study, upon adapting the organic livestock proximity index (OLPI) methodology proposed by Mena et al. (2012), the following changes were made to the original methodology in order to suit our purposes: (i) the original OLPI which has nine indicators was modified to 10 indicators due to the fact that the original OLPI combines weed control in pastures and crops and pest and disease control in pastures and crops into 1 indicator, and the modified OLCI separates them into 2 indicators; (ii) the original OLPI includes 56 variables, and the modified OLCI 35 variables; (iii) the original OLPI was applied to goat raising systems in southern Spain, and the modified OLPI was successfully applied to cattle raising systems in southeast Mexico; (iv) some of the original OLPI's weighting coefficients of the indicators were modified, adjusting them according to the management conditions of the livestock production systems studied; (v) equations of the original OLPI were slightly modified as a function of changes in number of indicators, number of variables, and the weighting coefficients.
Selection of variables and indicators was based on organic livestock raising principles with respect to: (i) use of permitted, prohibited, and restricted substances to prevent, cure, and eradicate illnesses and pests; (ii) non-contaminating agroecological technologies which are not dependent on capital and do not degrade the physical environment because they are based on efficient use of local resources, allowing for maintenance of biological diversity and the soil's long-term productive capacity (Guzmán & Alonso, 2001); and (iii) implementation of mechanisms for management and promotion of ecological livestock raising. Based on the strengths, weaknesses, opportunities, and threats (SWOT) analysis, the main strengths and weaknesses for defined indicators and variables were identified.
Variables were binomially coded (0, 1) in order to homogenize the original units of measure and facilitate calculating the real value of each indicator (without weighting); that is, the arithmetic average of the responses 0 or 1 (Grimm & Wozniak, 1990). In this manner, the 10 indicators were standardized to a percentage (%) or common relative scale. Thus, the optimum value (100%) was obtained for an indicator without weighting when the responses of all its variables were positive (coded as 1).
The percentage value of each indicator was obtained by means the sum of the responses of the indicator's variables (0 or 1) multiplied by 100.
The weighting coefficient or specific weight of each indicator for the study region was defined by consulting 12 experts in organic livestock production from different Spanish and Mexican research institutions as a function of: (i) the importance of that indicator to the agroecological principles of organic livestock raising; and (ii) the difficulty of eliminating or substituting inputs or practices prohibited by the organic standards (Table 1). In this sense, for the three indicators sustainable pasture management, food safety, and ecological management the greatest weights were assigned, because of their agroecological importance and the difficulty for the CPU in the Grijalva River Basin to reach them. In contrast, soil fertilization, ecological weed control in pastures and crops, ecological pest and disease control in pastures and crops, and breeds and reproduction indicators were assigned a lower score as, in general, the initial situation of the CPU for which the method is proposed is the closest to http://dx.doi.org/10.1080/23311932.2016.1153767 Note: Numbers in parentheses are the weighting coefficient of each indicator. (1.1) Using only animal feed permitted by the organic standards the organic model of production. The greatest and lowest assigned values for the indicators are similar to those used by Mena et al. (2012), but they are lower than those used by Olivares et al. (2005).
The weighted value was obtained by multiplying the value of each indicator by its specific weighting factor.

Organic livestock conversion index
The OLCI is based on the multi-criteria approach with respect to weighting and aggregating information (Falconi & Burbano, 2004;Munda, 2004;Munda, Nijkamp, & Rietveld, 1994) as a tool to: (i) understand the technological and environmental limitations and potentials of the CPU in a particular economic and social context, and (ii) guide decision-making toward organic production. The OLCI was obtained for each livestock production unit by summing the weighted values of the 10 indicators.

Approximation of cattle raising to the organic production standard
Values of 10 indicators and OLCI in CPU's for three municipalities are showed in Table 2. The values for sustainable pasture management, breed and reproduction, animal well-being, and food safety indicators vary among municipalities. Tacotalpa scored higher statistically significant differences than the other municipalities for sustainable pasture management and animal well-being; Mazapa scored the highest statistically significant differences in breeds and reproduction. The municipalities Mazapa and Tacotalpa scored higher values for food safety indicator than did Huitiupán, both scoring the same no satisfactory value (50%). The three municipalities: (i) satisfactorily comply for feed management and organic fertilization; (ii) acceptably comply for ecological pest and disease control in pastures and crops; and (iii) fail to comply with ecological weed control in pastures and crops, and veterinary prevention and treatment. The municipalities Mazapa and Tacotalpa scored higher statistically significant difference in the OLCI value (57%) than Huituipán (49%), both scoring the same satisfactory value. Coming up next each of 10 indicators will be analyzed.
(1) The first indicator-referring to feed management ( Table 2)-shows that the CPU of all three municipalities satisfactorily reaches the organic standards. That is due because cattle management in these municipalities is exclusively based on grazing, which means complying with  requisites that at least 60% of dry matter (DM) of the daily ration is green fodder (grazed or cut), hay, or silaged fodder, and that at least 50% of feed comes from the same farm or another organic farm. Very few external supplements are used; only a few CPU sporadically provide non-ecological commercial mineral salt to the animals. The fact that feeding in the three municipalities evaluated is based on grazing and negligible use of prohibited feed such as animal excrement, commercial products, or chemically synthesized additives (Council of The European Union, 2007;IFOAM, 2005;Müller-Lindenlauf et al., 2010) represents a strength of these systems; however, a few farms need to substitute the salt currently used with a permitted type of salt. Based on SWOT analysis, Table 3 shows the strengths and weaknesses of the indicators and variables identified for the three municipalities studied.
(2) For the sustainable pasture management indicator, the municipalities Huitiupán and Tacotalpa have a favorable approximation to the organic model (>70%)-greater (p > 0.05) than that of Mazapa (59%). This is due to use of a variety of techniques in the first two municipalities, such as: pasture rotation (MA = 12.4%; HU = 9.1%; TA = 6.0%); stocking rate ( (3) Regarding to the soil fertilization indicator, the CPU of the three municipalities comply with the organic production model, although in these regions, pastures are almost exclusively fertilized through defecation during grazing; a few CPU occasionally use chemical fertilizer in addition. Chemical fertilizers should be substituted by appropriate management of manure and organic fertilization techniques, such as composts (including bocashi and worm composting), biofertilizers, biofermentation, green manures, and cover crops (Labrador & Porcuna, 2006;Lague, Landry, & Roberge, 2005;Nogueroles & Sicilia, 2006).
(4) For the ecological weed control in pastures and crops indicator, the CPU of the municipality of Mazapa have the highest approximation (64.7%) to the organic standard. Many farmers avoid use of synthetic herbicides, preferring manual tools to eliminate weeds (MA = 64.7%; HU = 40.0%; TA = 31.8%), while others use a combination of both techniques (MA = 35.3%; HU = 60.0%; TA = 68.2%). Successful ecological weed control involves maintaining populations of undesired species which grow spontaneously in pastures and crops at acceptable levels, without completely eradicating them, although excessive multiplication is prevented (Menalled, Gross, & Hammond, 2001).
(5) For the ecological pest and disease control in pastures and crops indicator, the CPU of all three municipalities have a favorable approximation to the organic model (> 80%). In Huitiupán, close to 70% of farmers mentioned the presence of pests in grasses (principally fungal disease and worms). In Tacotalpa, just over 50% reported the presence of Aeneolamia spp. In Mazapa, less than 25% said they had problems with pests, the principal problem being the larvae "blind hen" (genus Phyllophaga). The majority said they avoided use of synthetic pesticides (MA = 88.2%; HU = 86.7%; TA = 84.1%), principally using mechanical pest control through grazing. Use of botanical insecticides and repellants (Isman, 2006) and integrated pest management, which includes ecological control of soils and biodiversity (Cook, Khan, & Pickett, 2007), are efficient substitutes for pesticide use (IFOAM, 2005).   TA = 70.0%), while procreation in all municipalities occurs naturally, without control. Adaptation to local climatic and management conditions are reflected in acceptable rates of calving (MA = 69.7%; HU = 61.0%; TA = 72.4%), number of cows per breeding bull (MA = 6.8; HU = 11.2; TA = 8.2), and mortality of calves (MA = 7.8%; HU = 15.0%; TA = 10.3%) and adults (MA = 4.8%; HU = 3.0%; TA = 4.4%). Although the organic standards permit artificial insemination, in 100% of CPU mounting is natural (direct) and continuous, and estrus of females and calving are also continuous. These practices allow for avoiding use of chemically synthesized hormones; farmers pointed out the need to have local breeding bulls or cross-breeds adapted to the region, which are practices that promote harmony of cattle with a region's specific conditions, as well as development of resistance to predominant diseases and parasites (Council of The European Union, 2007;IFOAM, 2005;Rozzi et al., 2007).

Indicators and variables Municipalities
(8) Regarding to the animal well-being indicator, the CPU of all three municipalities show an acceptable approximation (MA = 62.3%; HU = 62.7%; TA = 68.2%) to the organic standards. This is partly due to the fact that, on the one hand, they comply 100% with respect to: calves being naturally breastfed until eight months; sufficient space per head in roofed enclosures and outdoors; and a sufficient number of feeders and troughs. On the other hand, protection against inclement weather (cold, heat, rain, humidity) is deficient, and few farmers cut or trim horns of animals of any age (MA = 12.0%; HU = 13.0%; TA = 41.0%). Improvement of variables regarding well-being should be oriented toward offering optimal conditions for the animals to reproduce and for production, in general satisfying the animals' biological and comfort needs (von Borell & Sørensen, 2004).
(9) For the food safety indicator, the CPU of all three municipalities have a low approximation to the organic model (MA = 50.0%; HU = 0.0%; TA = 50.0%). In Mazapa and Tacotalpa, the value of food safety is greater (50%) than in Huitiupán (0%) because the animals of Mazapa and Tacotalpa have been shown to be free of brucellosis (using the plate agglutination test) and tuberculosis (using the bovine tuberculin test), although the few that are seropositive are eliminated from the herd, which does not occur in Huitupán. Another reason is that none of the CPU of the three municipalities have strict hygienic-sanitary control of facilities and work equipment, of milking management, and of the milk; and so far the products (milk, cheese, and meat) have not been shown to be free of antibiotics, hormones, pesticides, and other chemical substances. Evidence of food safety of animal products (meat, milk, and cheese) is the farmer's guarantee of quality to the consumer. The low level of compliance with respect to this indicator is an obstacle to meeting the organic standards in all three municipalities evaluated. In order to overcome this, strict hygienic-sanitary control must be implemented for infrastructure, tools, and the milking process, avoiding use of chemical substances (pesticides, antibiotics, and detergents, among others); undesirable biological contaminants (viruses, bacteria, molds, parasites), and harmful physical substances (pieces of metal, splinters, manure, garbage, etc.). Compliance with such requirements, together with meeting certain organoleptic characteristics (flavor, smell, and color of the meat, milk, and cheese) and nutritional characteristics increase the food's sanitary and nutritional quality and promote consumer confidence (Vaarst et al., 2005).
(10) For the ecological management indicator, the CPU of all three municipalities have not achieved almost any approximation to the organic standards with respect to the five corresponding variables because of a lack of training and advice; thus, there is a need to establish procedures that would allow farmers to obtain the necessary advice and training in order to transition to organics. Also, there is a need for internal control of the production process, processing, and marketing according to organic stipulations (Certificadora Mexicana de Productos y Procesos Ecológicos [CERTIMEX], 2007). Management involves negotiation and establishment of incentives to improve quality, as well as fair or constant sale prices year-round in order to motivate farmers to improve their products using sustainable techniques (Nahed et al., 2006(Nahed et al., , 2009von Borell & Sørensen, 2004).

Viability of organic conversion of livestock raising
Evaluating the level of approximation of conventional cattle raising to the organic production model provides the opportunity to identify limitations, potentials, and opportunities for promoting development of organic livestock production (Guzmán & Alonso, 2001;Nahed et al., 2009;Niemeyer & Lombard, 2003;Pimentel et al., 2005).
The values of OLCI for the CPU of Mazapa (56.8%) and Tacotalpa (56.7%) have intermediate levels of approximation as compared to values (55-75%) reported by Olivares et al. (2005) for organic cattle raising in Tabasco, and these values are greater than those for conventional cattle raising in the Frailesca (48.0%; Aguilar-Jiménez, 2011) and Marqués de Comillas regions (53.3%; Nahed et al., 2009) of Chiapas. This is due to the fact that the CPU of the three municipalities show higher values of approximation to the organic production model for the indicators feed management, soil fertilization, ecological pest and disease control, and breeds and reproduction, and similar values for indicators of sustainable pasture management, animal well-being, veterinary prevention, and treatment and food safety compared to those of conventional cattle raising of the Frailesca and Marqués de Comillas regions. In the case of Huitiupán, the OLCI value (49.0%) is somewhat lower than the values obtained for all these authors, and this lower value is due overall to food safety indicator.
In general, the level of approximation to the organic model of the CPU evaluated is principally a result of traditional management with low use of external inputs, more than the implementation of other sustainable production technologies and mechanisms of ecological management. The fact that the farmers have not received advice and training are only a general causes that limit the viability of organic conversion of the CPU evaluated, but it is necessary to deep about the causes of the different aspects for each indicator showed in Table 1, regardless of the fact that in the majority of these CPU, traditional production methods-and few external inputs-are used.
There is also a need to train farmers to substitute capital-dependent technologies which degrade the physical environment, with others technologies based on efficient use of local resources, thus promoting maintenance of biological diversity and the soil's long-term productive capacity (Guzmán & Alonso, 2001;Pimentel et al., 2005). The list of permitted, prohibited, and restricted substances indicated by the organic standards should be reviewed and respected, and implement mechanisms of management and promotion of organic livestock raising.
To achieve the objectives of organic production, from a functional point of view it is necessary to maximize the strengths offered by OLCI in the municipalities evaluated, particularly the related to the indicators feed management, sustainable pasture management, ecological soil fertilization, ecological pest and disease control in pastures and crops, breeds and reproduction, and animal well-being. On the other hand, the main weaknesses which currently limit the viability of organic conversion of the CPU evaluated in three municipalities of southern Mexico are related with the indicators ecological weed control in pastures and crops, veterinary prevention and treatment, food safety, and ecological management.
From a structural perspective, interventions require strengthening support mechanisms (financial, advisory, training, organization, and management) at all levels of the productive chain and establishing a development strategy for organic cattle raising, particularly a holistic policy of food sanitation and food safety which allows for meeting certification costs in order to distinguish products according to their quality; and permanent support in developing alliances among actors (production, marketing, transformation, and sale), as well as promotion of animal products in national and international markets. In this manner, meat, milk, and cheese produced in the three municipalities evaluated may be certified as organic-of maximum quality to be marketed in alternative niche markets, thus benefiting producers and consumers.
Regarding to other external factors that favor the development of organic farming, prevailing opportunities for the CPU to move toward organics are: diversification of the products obtained in the CPU, increase in demand for products obtained in production systems friendly to the environment, reconversion of the productive chain toward value chain (the productive chain are currently limited due to low levels of quality control of the products and the lack of strategic relations or alliances among actors involved in order to transition toward value chains, which impedes selling in the formal market and causes prices to be significantly less than desirable), the upward trend in cattle prices, government programs for livestock development and foray of the producers into new market niches. Because of its great importance, highlights the use of organic or ecological pesticides for pest and disease control in pastures and crops (an internal factor that represents an opportunity).
On the other hand, the major threats facing the organic farming in the region are the fluctuations in the price of cattle, vulnerability of producers to changes in supply and demand for agro-food products, threats to livestock production caused by climate change (e.g. disease outbreaks, instability in the pasture productivity, and loss of adaptability) and the possibility of an economic crisis harming the chances of consumer purchasing. Do not apply vaccines against endemic diseases (internal factor) is a weakness, but it is also a threat to herd health.

Conclusions
The level of approximation of the CPU to the organic standard is higher in the municipalities Mazapa (56.8%) and Tacotalpa (56.7%) than in Huitiupán (49.0%).
The main strengths of the CPU in order to fully meet the organic standards lies in the indicators of feed management, sustainable pasture management, ecological soil fertilization, ecological pest and disease control in pastures and crops, breeds and reproduction, and animal well-being.
The weaknesses that the CPU in the three municipalities should overcome in order to increase the viability of organic certification are with respect to the following areas: ecological weed control in pastures and crops, veterinary prevention and treatment, food safety and ecological management.
The main opportunities for the CPU to move toward organics are: diversification of the products obtained in the CPU, increase in demand for products obtained in production systems friendly to the environment, reconversion of the productive chain toward value chain, upward trend in cattle prices, government programs for livestock development, and foray of the producers into new market niches.
The major threats for the organic farming are the fluctuations in the price of cattle, vulnerability of producers to changes in supply and demand for agro-food products, threats to livestock production caused by climate change (e.g. disease outbreaks, instability in the pasture productivity, loss of adaptability), and the possibility of an economic crisis harming the chances of consumer purchasing.
Finally, it is necessary to train and advise farmers on production techniques and ecological management, as well as offering a comprehensive policy for the development of organic farming.

Funding
This publication was made possible thanks to the support of the Institutional Fund for Regional Fomentation of Scientific and Technological Development and Innovation (FORDECYT according to its Spanish initials) of Mexico's National Council on Science and Technology (CONACYT according to its Spanish initials) through agreement 143303: "Strategies for sustainable management for regional development in the Grijalva cross-border hydrographic basin," supported by matching funds by the Secretary of Natural Resources and Environmental Protection (SERNAPAM according to its Spanish initials) of the Mexican state of Tabasco.