Indigenous Knowledge of Farmers in Breeding Practice and Selection Criteria of Dairy Cows at Chora and Gechi Districts of Ethiopia: An Implication for Genetic Improvements

This study assessed the breeding practice and selection criteria of dairy cows in two districts. A total number of 288 structured questionnaires were utilized to gather information from households in the study areas. Logit model, indices, and descriptive statistics were employed for data analysis. Education, marital status, and family size of respondents from Chora district were confirmed as predictors for practicing the controlled mating system and significantly influenced at p < 0.05. The odds of practicing the controlled mating system by educated and married farmers in Chora district were 10.01 and 4.82 times higher compared to uneducated and unmarried farmers, respectively, and also, for every additional increase in family size, they increased by the factor of 1.21. Educational and marital status of farmers in Gechi district also influenced the use of controlled mating. The odds of performing controlled mating based on the educational level and marital status of the farmers were higher among educated and married individuals. Based on indigenous knowledge, teat size, udder size, and pelvic width were the 1st three ranked traits used as major selection criteria of dairy cows in Gechi district, whereas body length was the 1st among others in Chora district. This finding indicated that the combination of indigenous knowledge with modern science is important to improve cow's genetics. The study suggests that mating systems and selection criteria should be considered as baseline information for designing the genetic improvement programs.


Introduction
Livestock farming is strongly associated with rural communities because of the importance of livestock in the society [1]. Livestock species have been selected based on the needs and agroclimatic conditions of the region. Some of these breeds of livestock have been developed based on their importance, adaptation, and availability in that region and also their ability to be improved by selection. Introduction of improved selection methods and exotic breeds around the world such as Asia, Africa, and Latin America has changed the traditional knowledge and skills as well as traditional selection practices of livestock farmers [1]. Indigenous technical knowledge (ITK) is a vital part of beliefs and antiquity of indigenous societies, and it has advanced over the years of consistent trailing on the routine life and existing assets in the community. It is also indispensable for the conservation of genetic resources for the sustainability of the breed/type [2].
Ethiopia is greatly rich in cattle population in Africa, and it is endowed with a wide range of local genetic resources and diverse livestock production systems [3]. e estimated cattle population in percentage in Ethiopia is 97.76 (indigenous), 1.91 (hybrid), and 0.32 (exotic) [4].
ere are about 32 identified local breeds of cattle; however, the indigenous knowledge on livestock genetic resource management was unreported in Ethiopia [3]. Milk, meat, income, and other social functions are the primary aim for keeping cattle in Ethiopia. Some of these cattle are characterized with low productive performance. Low productive performance of cattle may be due to the influence of limiting factors such as lack of genetic improvement interventions, input shortage/lack, and indigenous farming practices as well as other environmental factors [5,6]. Survivability and adaptability are the main preferred traits by the farmers. ese traits enable the local breeds of cattle to survive and thrive on harsh environmental conditions.
In dairy cattle breeding, the indigenous breeding bulls have been used for natural mating. is method is practiced by most of the dairy farmers dwelling in highlands, midlands, and lowlands of Ethiopia [5], whereas artificial insemination (AI) has been used by some of the farmers in some regions. Farmers and their trait preferences differ across communities, farming systems, and agroecological zones [7]. Livestock production system influences the ranking system of a specific trait by livestock keepers. It has been reported that the livestock production system has a direct influence on some of the economically important traits. Furthermore, traditional knowledge and skills used to produce viable livestock rearing practices such as animal husbandry practices [8]. Studies on traditional cattle breeding practice and selection criteria are limited in some districts of Oromia Regional State of Ethiopia. is research therefore is aimed at investigating the indigenous breeding practice and selection criteria of cattle practiced by farmers in Chora and Gechi districts of Ethiopia.

Description of the Study Areas.
e study was conducted at Gechi and Chora districts of Oromia Regional State of Ethiopia. Districts are characterized with good potential livestock production and some cash crop production. Gechi and Chora districts are situated at 462 and 516 km from the capital city of Addis Ababa towards the southwest direction of the country [9]. Gechi district is located at the longitude of 36°39′ 59.99″ E and latitude of 8°19′ 60″ N [10] and Chora district at 36°14′60″ E and 8°19′60″ N [11]. Furthermore, Chora district is popularly known as khat (Catha edulis) and coffee (Coffea) producing district besides livestock [5]. e authors further reported that agriculture is the main source of livelihood in both districts, and mixed livestock and crop production systems are well practiced in the study areas.

Sample Size Determination.
e total number of respondents required was determined using the formula developed by Cochran [12] for the heterogeneous populations. e formula is where N is the total number of desired respondents, Z is the standard deviate value, p is the proportion of the study population from the entire population, q is the complementary proportion to p, and e is the desired absolute precision. Based on the values of Z � 1.96, p � 0.25, q � 0.75, and e � 0.05, a total of 288 households were involved in this study.

Sampling Technique and Data Collection.
Multistage sampling techniques were employed to select the representatives from the study areas. Among the existing districts in Buno Bedele Zone, Gechi and Chora districts were selected based on livestock population potential and accessibility of infrastructures such as roads and others. e list of farmers involved in cattle rearing with a minimum of five years was compiled through consultation and assistance of agricultural experts in both study areas. Among a total of 288 households that participated in the study, 144 of them were selected for an interview section from each district using proportional random sampling techniques. e proportion was conducted based on the area covered in different agroecological zones. Primary data were collected using a structured questionnaire, whereas secondary data were from different governmental offices and other sources. e questionnaire was pretested before the real data collections. e interview was conducted on the general household's characteristics, cattle mating systems, and indigenous knowledge for dairy cow selection.

Data Management and Analysis.
e data collected were prepared using a Microsoft Excel sheet and analyzed using R software package, version 4.0.3 [13]. Descriptive statistics (%) were employed to determine the proportion of mating systems. e association between general household characteristics and the controlled mating system was determined by multiple binomial logistic regression analysis. e selection criteria of dairy cows were calculated using indices employed by Musa et al. [14] for ranking different parameters. e calculation was performed to assess the ranking of household's responses on criteria of selecting dairy cows. e formula is where R n is the last rank (for example, if the last rank is 8, then R n � 8, R n − 1 � 7, and R 1 � 1), C n is the frequency of respondents in the last rank, and C 1 is the frequency of respondents ranked first. From the above formula, the "numerator" represented the sum given for particular selection criteria, and the "denominator" is the sum given for all selection criteria. e generalized multivariate binomial logit (G-MBL) model was employed to identify the association between factors influencing the mating system. e model was fit to dependent variables (controlled and uncontrolled mating systems) and also determined the effect of independent variables. e model was described as follows: where P(Y � 1) is the probability of being a controlled mating system, X 1 − p is the vector of predictor variables (sex, age, marital status, educational status, and family size), β 0 is the intercept of the equation, and β 1 , β 2 , . . . β p are coefficients of predictor variables.

Breeding Practice.
e breeding practice of households in the study areas involves controlled and uncontrolled mating systems (Figure 1). e result indicates that the uncontrolled mating system was dominantly practiced by 63.19% of farmers in Chora and 65.97% in Gechi districts. Mating system plays an important role on the livestock improvement scheme, and the use of natural bull service through uncontrolled or unplanned mating is rampant in both study areas. Similar results have been reported by Ayantu et al. [15] in Western Oromia, Ethiopia. Our results agree with those of Azage et al. [6], who observed that free range mating is predominant in the rural areas of Ethiopia.
is could be attributed to the lack of awareness, inaccessibility of information, and lack of adhering advice provided by agricultural extension workers. It could also be due to the loss of trust while using AI and absence of selected bulls for natural mating. Mengistu et al. [5] reported similar results in the Bedele district of Oromia Regional State of Ethiopia.

Factors Affecting the Mating System.
e relationship between factors affecting the mating system in Chora and Gechi districts is presented in Tables 1 and 2. e result indicates that educational status, marital status, and family size are predictors for applying the controlled mating system in Chora district. e factors significantly influence those farmers who engaged in the controlled mating system. e findings further indicate that educational status of the farmers was highly significant among the factors. e odd of practicing controlled mating was 10.01 higher in educated farmers compared with uneducated farmers. is implies that the rate of transfer and adoption of new technology are higher among educated farmers. Similar trends were observed between married and unmarried as well as family size. It was evident that family size is associated with the use of controlled mating. In Gechi district, similar results and trends were observed but with different magnitudes in educational and marital status. e findings showed that educated and married farmers are highly engaged in the controlled mating system. ese factors are indicators of the controlled mating system in both regions. However, an increase in family size did not encourage the controlled mating system in Gechi district. e impact of educational status of farmers on adoption of advanced technologies has been examined in previous studies [16,17]. e finding indicates that educated households are knowledgeable in decision-making towards the controlled mating system in terms of cows' reproduction. is could be attributed to that educated farmers are faster to learn advanced technologies, accept, and implement advices from professionals. Oduro-Ofori et al. [18] stated that formal education is important for improving agricultural products and productivity through opening the minds of farmers to knowledge. e authors added that informal education keeps the farmers well informed with changing innovations and ideas and allows farmers to share their gained experience.
e finding reported by Paltasingh and Goyari [19] agrees with our study and supports a previous study [17]. Our results revealed that married households are engaged with the controlled mating system, and it may be due to the fact that the married households have more concern for reducing the consequence of inbreeding and increasing the production to maintain their livelihoods. Similar results have been reported by Mabe et al. [20].

Selection Criteria of Dairy Cows.
Several traits were observed as selection criteria in dairy cows among the farmers dwelling in Gechi district (Table 3). Our result revealed that teat size, udder size, pelvic width, body length, neck size, height at wither, navel flap size, and dewlap size were ranked from 1 st to 8 th with index values of 0.191, 0.182, 0.153, 0.13, 0.12, 0.116, 0.068, and 0.04, respectively. Table 4 shows indigenous selection criteria of dairy cows in Chora district. e findings showed that body length, udder size, pelvic width, teat size, height at wither, navel flap size, neck size, and dewlap size were ranked from 1 st to 8 th with index values of 0.167, 0.166, 0.138, 0.132, 0.124, 0.117, 0.091, and  Veterinary Medicine International 0.066, respectively. Based on the selection criteria, the first three traits are important and preferred by farmers. ose traits are indicators for selecting dairy cows. Several authors have reported long teat as an indicator for dairy cows [1,21]. e authors added that cows with long teat are less vulnerable to mastitis. Long teat channel prevents infectious diseases because of the teat channel cessations after milking. It also stops the association between udder tissues and the external environment [22]. Udder size and pelvic width were also observed as selection criteria for dairy cows. Several authors have reported udder size and pelvic width as selection criteria for dairy cows in Northern Amhara Region, Northern Gondar Zone, and East Gojjam Zone of Ethiopia [23][24][25]. More recently, udder size has been reported by Soeharsono et al. [26], who observed a correlation between udder size and milk production. e correlation may be due to the fact that milk secretion is highly associated with the development of the mammary gland. Our findings are in agreement with the previous finding of Gorewit [27]. Wider pelvic size was also observed as a selection criterion, and this implies that farmers prefer cows with wider pelvic size to prevent difficulties in calving (dystocia). Similar results have been reported by Godadaw et al. [23], Ayeneshet et al. [24], and Andarge et al. [25]. Body length was observed as one of the selection criteria for dairy cows in Chora district. Yeman et al. [28] reported similar results in Gondar, Ethiopia. Moreover, Bayram et al. [29] observed that body length is associated with milk production.

Conclusion
In both study areas, the farmers were predominantly engaged with the uncontrolled mating system. e variables such as educational status, marital status, and family size were predictors of the controlled mating system in Chora district, whereas family size was not an indicator of controlled mating in Gechi district.
is study showed that indigenous knowledge for dairy cow selection is commonly practiced in the study areas, suggesting that predictor variables, breeding practice, and selection criteria should be considered in designing dairy cows' genetic improvement scheme.
is study suggests that awareness should be created on the effect of the uncontrolled mating system across productive and reproductive performances of cattle and its consequences.

Conflicts of Interest
e authors declare that there are no conflicts of interest.