Data/hora: 03/06/2024 16:58:58

Provedor de dados: 	96	
País: 	Brazil	
Título: 	Effect of vitamin K on bone integrity and eggshell quality of white hen at the final phase of the laying cycle	
Autores: 	Fernandes,Jovanir Inês Müller; Murakami,Alice Eiko; Scapinello,Claudio; Moreira,Ivan; Varela,Elkin Varela.	
Data: 	2009-03-01	
Ano: 	2009	
Palavras-chave: 	Eggshell quality; Layer; Osteoporosis.	
Resumo: 	The effect of four levels of dietary vitamin K (vit. K) on production, egg quality and bone structure of laying hens near the end of the production cycle were studied. A total of 192 Hy-Line, W-36 hens, 67 weeks of age, were distributed into a completely randomized design with four treatments (0, 2, 8, 32 mg vit. K/kg of diet), six replicates and eight birds per experimental unit. Corn-soybean-meal basal diets were isonitrogenous (15.5% crude protein), isoenergetic (2,790 kcal ME/kg), isocalcium (4.25% Ca) and isophosphorus (0.40% available P). Vitamin K supplementation did not alter egg mass, feed intake, feed conversion (kg/kg), bone breaking strength, specific egg gravity, eggshell weight, thickness and percentage of thin and cracked shell. A linear effect on egg weight, laying percent, and feed conversion (kg/dozen) was observed, as well as a quadratic effect on the ash bone content. In conclusion, the inclusion of increasing levels of vitamin K to the diet influenced performance and bone mineralization, but not eggshell quality. The lack of consistency in the efficiency of supplemental vitamin K on eggshell quality may be due to the age of hens.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000300013	
Editor: 	Sociedade Brasileira de Zootecnia	
Relação: 	10.1590/S1516-35982009000300013	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Zootecnia  v.38 n.3 2009	
Fonte: 	info:eu-repo/semantics/openAccess