Data/hora: 03/06/2024 02:08:42

Provedor de dados: 	86	
País: 	Brazil	
Título: 	Limestone particle sizes and lighting regimens on egg and bone quality of laying hens	
Autores: 	Xavier,Regina Patrícia de Souza; Freitas,Ednardo Rodrigues; Braz,Nádia Melo; Farias,Nadja Naiara Pereira; Lima,Raffaella Castro; Watanabe,Pedro Henrique; Nascimento,Germano Augusto Jerônimo; Peixoto,Maria Simone Mendes.	
Data: 	2015-08-01	
Ano: 	2015	
Palavras-chave: 	Egg mass; Shell thickness; Specific gravity; Tibia.	
Resumo: 	Abstract:The objective of this work was to evaluate the effect of limestone particle sizes in the diet and of lighting regimes on the egg and bone quality and on the performance of commercial laying hens. Three hundred Hissex White layers, at 18 weeks of age, were distributed in a completely randomized design, in a 5×2 factorial arrangement (coarse limestone in the diet at 0, 25, 50, 75, and 100%; with or without artificial light), with five replicates of six birds. No significant interaction was observed between particle sizes and lighting regime for the evaluated parameters. There was no significant effect of coarse limestone level in the diet on the performance and egg quality of hens; however, bone deformity (3.23 to 4.01 mm), strength (5.19 to 6.70 kgf cm-2), and mineral matter (51.09 to 59.61%) improved as the proportion of coarse limestone increased. For lighting regime, the treatment with artificial light yielded higher Haugh unit values (87.17 vs. 85.54) than that with natural light only. Greater limestone particles improve bone quality of laying hens, and the use of artificial light can benefit the albumen quality of the eggs.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000800718	
Editor: 	Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira	
Relação: 	10.1590/S0100-204X2015000800010	
Formato: 	text/html	
Fonte: 	Pesquisa Agropecuária Brasileira  v.50 n.8 2015	
Fonte: 	info:eu-repo/semantics/openAccess