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Protein supplementation to early lactation dairy cows grazing tropical grass: Performance and ruminal metabolism.
Jado Chagas, Lucas; Delveaux Araujo Batalha, Camila; de Arruda Camargo Danés, Marina; Maurício Santos Neto, José; Lopes Macedo, Fernanda; da Silva Marques, Rodrigo; Augusto Portela Santos, Flávio.
Afiliação
  • Jado Chagas L; Department of Research and Development, Roullier Animal Nutrition, Minga Guazú, Paraguay.
  • Delveaux Araujo Batalha C; Instituto de Zootecnia, Centro Avançado de Pesquisa de Bovinos de Corte, Sertaozinho, Brazil.
  • de Arruda Camargo Danés M; Department of Animal Science, University of Lavras, Lavras, Brazil.
  • Maurício Santos Neto J; Department of Animal Science, Michigan State University, East Lansing, Michigan, USA.
  • Lopes Macedo F; Department of Animal Science, University of Sao Paulo, São Paulo, Brazil.
  • da Silva Marques R; Department of Animal and Range Science, Montana State University, Bozeman, Montana, USA.
  • Augusto Portela Santos F; Department of Animal Science, University of Sao Paulo, São Paulo, Brazil.
Anim Sci J ; 92(1): e13564, 2021.
Article em En | MEDLINE | ID: mdl-34047427
This experiment was designed to evaluate the effects of different concentrate crude protein (CP) concentration on performance, metabolism and efficiency of N utilization (ENU) on early-lactation dairy cows grazing intensively managed tropical grass. Thirty cows were used in a ten replicated 3 × 3 Latin square design. The treatments consisted of three levels of concentrate CP: 7.9%, 15.4%, and 20.5% offered at a rate of 1 kg (as-fed basis)/3 kg of milk. The cows fed low and medium CP had negative balance of rumen degradable protein and metabolizable protein. Increasing CP tended to linearly increase DMI, 3.5% FCM and milk casein, and linearly increased the yields of milk fat and protein. Increasing CP linearly increased the intake of N, the concentration of rumen NH3 -N, and the losses of N in milk, urine, and feces. Increasing dietary CP linearly increased the molar proportion of butyrate but had no effect on the other rumen VFAs and no effect on microbial yield. In conclusion, feeding a concentrate with 20.5% of CP to early-lactation dairy cows grazing tropical grasses, leading to a 17.8% CP diet, tended to increase DMI, increased the yield of 3.5% FCM and the milk N excretion, and decreased ENU by 32%.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Rúmen / Clima Tropical / Lactação / Bovinos / Proteínas Alimentares / Suplementos Nutricionais / Leite / Dieta / Herbivoria / Poaceae Limite: Animals Idioma: En Revista: Anim Sci J Assunto da revista: MEDICINA VETERINARIA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Paraguai País de publicação: Austrália
Texto completo
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XML
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Rúmen / Clima Tropical / Lactação / Bovinos / Proteínas Alimentares / Suplementos Nutricionais / Leite / Dieta / Herbivoria / Poaceae Limite: Animals Idioma: En Revista: Anim Sci J Assunto da revista: MEDICINA VETERINARIA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Paraguai País de publicação: Austrália