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| Guimarães,Clóvis Ribeiro; Azevedo,Rafael Alves de; Campos,Mariana Magalhães; Machado,Fernanda Samarini; Pedroso,Alexandre Mendonça; Carvalheira,Luciano de Rezende; Tomich,Thierry Ribeiro; Pereira,Luiz Gustavo Ribeiro; Coelho,Sandra Gesteira. |
| Abstract: The objective of this work was to evaluate the effect of reducing crude protein (CP) contents in diets with a constant metabolizable protein content on the intake, performance, nitrogen balance, and nutrient digestibility of lactating Holstein-Gyr cows. Animals (n = 24, 103±23 days in milk) were allocated to four treatments (n = 6 per group) with different CP contents: 127, 132, 139, and 156 g kg-1 dry matter (DM). DM intake was not affected by treatments. CP intake and digestibility increased linearly with higher CP contents. Milk yield (23.7±3 kg per day) and the percentages of milk protein (3.3±0.2%) and fat (3.8±0.5%) were not affected by CP reduction. Milk and blood urea nitrogen increased linearly with the increase of CP in the diet,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen; Protected soybean meal; Soypass; Urea. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000700858 |
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