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Nutrient utilization, performance, and milk fatty acid composition of grazing cows fed supplements with babassu coconut

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Abstract

This study evaluated the effects of dietary inclusion of cracked babassu coconut (CBC) in the supplement on nutrient utilization, performance, and milk fatty acid (FA) composition of dairy cows grazing Megathyrsus maximus cv. Mombasa. Five multiparous Holstein × Zebu mid-lactation cows (125 ± 16.5 days in milk) were assigned to five dietary treatments (replacement of 0%, 20%, 40%, 60%, and 80% of ground corn with CBC, on a dry matter (DM) basis) in a 5 × 5 Latin square design. The intake of DM from the supplement, crude protein (CP), non-fiber carbohydrate (NFC), fat (ether extract (EE)), and total digestible nutrients (TDNs) decreased linearly (P < 0.05), while the intake of DM from forage increased linearly (P < 0.05), with the increase in CBC inclusion in the supplement. Conversely, total DM intake was unaffected (P > 0.05). The DM, NFC, EE, and TDN digestibility decreased linearly (P < 0.05), while organic matter (OM) digestibility decreased in a quadratic fashion (P < 0.05), as CBC inclusion in the supplement increased. Nevertheless, digestibility of CP was unaffected (P > 0.05). Milk yield and composition (lactose, fat, protein, casein, and majority of FA) showed a linearly decreasing pattern (P < 0.05) with the increasing of CBC inclusion. However, proportions of trans-vaccenic acid, rumenic acid, total monounsaturated FA, and odd- and branched-chain FAs increased linearly (P < 0.05). On the opposite, total saturated FA (SFA) and the n-6:n-3 FA ratio in milk fat decreased linearly (P < 0.01). Hence, replacement of corn meal with CBC up to 80% in the supplement decreases nutrient intake and digestibility, as well as milk yield response in grazing dairy cows. However, CBC inclusion may enhance the nutritional properties of milk fat.

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Acknowledgements

The authors thank the members (professors, students, and technicians) of the Research Group on the Production of Ruminant Animals from Carajás (GEPARC) for the support during data collection and chemical analysis.

Funding

This study was supported by the Programa Nacional de Cooperação Acadêmica na Amazônia (PROCAD/Amazônia) of the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brasília, D.F, Brazil) and the Fundação Amazônia de Amparo a Estudos e Pesquisa (FAPESPA, Belém, PA, Brazil).

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Ícaro Rainyer Rodrigues de Castro: data collection, writing and preparation of the original draft, and writing involving reviewing and editing. Dayana Lima Maciel: data collection, writing and preparation of the original draft, reviewing, and editing. Julián Andrés Castillo Vargas: writing and preparation of the original draft and writing involving reviewing and editing. Daiany Iris Gomes: data collection, writing and preparation of the original draft, reviewing, and editing. Raylon Pereira Maciel: data collection, writing and preparation of the original draft, reviewing, and editing. Rafael Mezzomo: visualization, writing and preparation of the original draft, and writing involving reviewing and editing. Marco Antônio Sundfeld da Gama: data collection and writing involving reviewing and editing. Luís Rennan Sampaio Oliveira: data collection and investigation. Luckas Thiago Oliveira Galvão: data collection and investigation. Kariane da Silva Pereira: data collection and Investigation. Kaliandra Souza Alves: conceptualization of the manuscript, project administration, funding acquisition, supervision, and writing and preparation of the original draft.

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Correspondence to Julián Andrés Castillo Vargas.

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de Castro, Í.R.R., Maciel, D.L., Vargas, J.A.C. et al. Nutrient utilization, performance, and milk fatty acid composition of grazing cows fed supplements with babassu coconut. Trop Anim Health Prod 53, 433 (2021). https://doi.org/10.1007/s11250-021-02869-y

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