Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/14469
Tipo: Artigo
Título: Performance and metabolite profile of dairy cows fed tropical grasses and concentrates containing crude protein with low or high degradability
Autor(es): Gomes, Raphael dos Santos
Oliveira, Tadeu Silva de
Pereira, José Carlos
Vieira, Ricardo Augusto Mendonça
Henrique, Douglas Sampaio
Fernandes, Alberto Magno
Leonel, Fernando de Paula
Abstract: Ten Holstein-Zebu crossbred cows distributed into two simultaneous Latin squares (5 × 5) as a 2 × 2 factorial arrangement formed by chopped sugarcane or elephant grass silage, both with high or low protein degradability supplements and a corn silage as a control treatment, were compared using orthogonal contrasts. The studied variables were the performance, plasma concentrations of urea-N, glucose, and creatinine, urine-N and milk urea-N, and the nychthemeral variation in NH3-N in the rumen fluid of dairy cows. Nutrient intake, milk production, and milk composition were affected by the treatments. The total mixed ration containing elephant grass silage combined with rumen undegradable protein (RUP) provided balanced amounts of carbon and nitrogen in the rumen. This effect may explain the 18% increase in milk yield compared with the other treatments. The diurnal pattern of ruminal NH3-N was interpreted with a sinusoid model. In general, cows fed elephant grass silage exhibited higher concentrations of blood plasma and milk urea-N than animals fed sugarcane. The cows that consumed elephant grass silage with rumen degradable protein concentrate showed a higher milk urea-N compared with animals that consumed elephant grass silage with the RUP concentrate. The use of diets based on corn silage leads to a better use of nitrogen compounds because these diets resulted in lower levels of urea-N in the plasma, urine, and milk at the same level of milk production compared with diets containing elephant grass silage or chopped sugarcane as roughages. In sugarcane-based diets, even greater nitrogen losses in the urine are observed, despite the presence of readily fermentable carbohydrates in the diet.
Palavras-chave: Intake
Milk yield
Nitrogen metabolites
Tropical forages
Editor: Revista Brasileira de Zootecnia
Tipo de Acesso: Open Access
URI: http://dx.doi.org/10.1590/s1806-92902016000900010
http://www.locus.ufv.br/handle/123456789/14469
Data do documento: 2-Jun-2016
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