Data/hora: 06/06/2024 01:39:00

Provedor de dados: 	96	
País: 	Brazil	
Título: 	Urea in sugarcane-based diets for dairy cows	
Autores: 	Santiago,Alberto Magno Ferreira; Campos,José Maurício de Souza; Oliveira,André Soares de; Valadares Filho,Sebastião de Campos; Santos,Stefanie Alvarenga; Souza,Shirley Motta de; Santiago,Iara Furtado.	
Data: 	2013-06-01	
Ano: 	2013	
Palavras-chave: 	Metabolism; Milk production; Nitrogen.	
Resumo: 	We evaluated the effect of adding four levels (0, 4, 8 and 12 g/kg, as fed) of a mixture (9:1) of urea and ammonium sulfate (UAs) to sugarcane on feed intake and digestibility, productive performance and metabolism of nitrogen compounds of dairy cows. Twelve multiparous Holstein cows (12.6±0.5 kg/d of milk, 225±90 days in milk) were distributed in three 4 × 4 Latin squares, receiving diets with the same amount of nitrogen (125 g crude protein/kg of dry matter). Concentrate feed was supplied at a ratio of 1 kg for each 3 kg of milk produced. The sugarcane presented 21.9 ºBrix. The level of UAs did not affect intake, total digestibility of diet components, milk production or milk components. Increasing UAs level linearly increased concentration of plasma urea nitrogen (PUN), urinary excretion of nitrogen and contribution of non-urea nitrogen in the urinary excretion and linearly reduced milk production/urinary excretion of nitrogen ratio. In spite of the linear increase of PUN with increased urea, the maximum value observed (14.31 mg/dL) was below the threshold value of 20 mg/dL, above which reproductive function may be compromised. In diets with sugarcane for dairy cows with production below 15 kg/day, the UAs level may be raised from 0 to 12 g/kg natural matter without impairing performance.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000600010	
Editor: 	Sociedade Brasileira de Zootecnia	
Relação: 	10.1590/S1516-35982013000600010	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Zootecnia  v.42 n.6 2013	
Fonte: 	info:eu-repo/semantics/openAccess