Urea nitrogen in the urine of dairy cows fed with crambe meal in replacement of dietary soybean meal

Todos os textos, informa??es e resultados apresentados s?o de inteira responsabilidade dos autores.Objetivou-se avaliar a concentra??o de nitrog?nio ureico na urina de vacas F1 Holand?s x Zebu, alimentadas com farelo de crambe em substitui??o ao farelo de soja. O experimento foi realizado na Fazenda Experimental da EPAMIG (Empresa de Pesquisa Agropecu?ria de Minas Gerais), situada na cidade de Felixl?ndia, Minas Gerais. Foram utilizadas 20 vacas mult?paras, no ter?o m?dio de lacta??o. O ensaio teve dura??o de 27 dias, sendo os 20 primeiros para adapta??o. Os tratamentos se basearam na substitui??o do farelo de soja pelo farelo de crambe no concentrado, nos n?veis de 0, 25, 50, 75 e 100%. Foram coletadas amostras de urina no 24? e 25? dia para an?lise de ureia. Houve diminui??o nos n?veis de ureia urin?ria (P?0,05) com o aumento de inclus?o do farelo de crambe.The objective was to evaluate the concentration of urea nitrogen in the urine of F1 Holstein x Zebu cows, fed crambe meal replacing soybean meal. The experiment was conducted at the Experimental Farm of EPAMIG (Agricultural Research Company of Minas Gerais), located in the city of Felixl?ndia, Minas Gerais. They were used 20 multiparous cows in mid lactation. The experiment lasted 27 days with the first 20 for adaptation. The treatments were based on replacing soybean meal with crambe meal in the concentrate at levels of 0, 25, 50, 75 and 100%. Blood samples were collected at 24 and 25 days for urea analysis. There was a negative linear behavior (P?0.05) increased with the inclusion of crambe meal