Data/hora: 13/06/2024 15:31:05

Provedor de dados: | 96
País: | Brazil
Título: | Fatty acid profile and composition of milk protein fraction in dairy cows fed long-chain unsaturated fatty acids during the transition period
Autores: | Rennó,Francisco Palma; Freitas Júnior,José Esler de; Gandra,Jefferson Rodrigues; Verdurico,Lenita Camargo; Santos,Marcos Veiga dos; Barletta,Rafael Villela; Venturelli,Beatriz Conte; Vilela,Flávio Garcia.
Data: | 2013-11-01
Ano: | 2013
Palavras-chave: | Calcium salts of fatty acids; Corn silage; Soybean oil.
Resumo: | The objective of this study was to evaluate the utilization of different sources of unsaturated long-chain fatty acids in diets for dairy cows during the transition period and early lactation on the milk fatty acid profile and composition of the protein fraction. Thirty-six Holstein cows were divided into three groups, fed the following diets: control (C); soybean oil (SO); and calcium salts of long-chain unsaturated fatty acids (CS). The milk samples utilized for analysis were obtained weekly from parturition to twelve weeks of lactation; each one of the samples originated from two daily milkings. Milk composition and total nitrogen, non-protein nitrogen and non-casein nitrogen levels were analyzed. The cows receiving the diet with calcium salts had lower concentrations of non-protein nitrogen (%CP) in milk compared with the animals fed the diet with soybean oil. There was a decrease in concentration of medium-chain fatty acids C12-C16, and a concomitant increase in concentrations of long-chain fatty acids &gt;C18 in milk fat for the animals fed the diets CS and SO when compared with diet C. Soybean oil and CS diets increased milk-fat concentrations of the acids C18: 1 trans-11, C18: 2 cis-9, trans-11 and C18: 2 trans-10 cis-12 in relation to diet C. The utilization of sources of long-chain fatty acids in the diet of dairy cows increases the biological value of milk in early lactation due to higher concentrations of specific fatty acids such as CLA C18: 2cis-9, trans-11.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013001100008
Editor: | Sociedade Brasileira de Zootecnia
Relação: | 10.1590/S1516-35982013001100008
Formato: | text/html
Fonte: | Revista Brasileira de Zootecnia  v.42 n.11 2013
Fonte: | info:eu-repo/semantics/openAccess