Data/hora: 10/06/2024 15:06:58

Provedor de dados: 	89	
País: 	Brazil	
Título: 	Effect of selection for productive traits in broiler maternal lines on embryo development	
Autores: 	Schmidt,GS; Figueiredo,EAP de; Ledur,MC; Alves,HJ.	
Data: 	2003-05-01	
Ano: 	2003	
Palavras-chave: 	Correlation; Egg weight; Embryo weight; Genetic gain; Meat lines.	
Resumo: 	This study used 300 females and 30 males with 36 weeks of age from the selected PP and control PPc maternal broiler lines. PP has been selected for heavy body weight (PC) and high egg production for eight generations. Fertile eggs were collected and weighed individually for 4 periods of 5 consecutive days at two-week intervals. In each period, a total of 960 eggs/line were identified and separated in groups of 240 eggs, and stored for later incubation. Embryo weight (PE) was evaluated at 9 (P9), 11 (P11), 13 (P13), 15 (P15), 17 (P17) and 21 (P21) days of incubation. The objective was to estimate the effect of selection on embryo development. Egg weight (PO) was similar between the two lines. The differences in PE were significant from P15 on, resulting in 1.9g of difference in the chick weight, indicating correlated genetic changes in the embryo development, which can be credited to the selection for PC. Changes in PE while PO was kept unaltered modified the correlations between these two traits. Differences were significant from P13 on and estimated correlations for P21 were 0.72 and 0.70 for PP and PPc, respectively. Chick weight corresponded to 70.91% (PP) and 68.48% (PPc) of egg weight. The estimated increase in P21 that resulted from the increase of 1.0g in PO was 0.71 in PP and 0.68g in PPc.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000200006	
Editor: 	Fundação APINCO de Ciência e Tecnologia Avícolas	
Relação: 	10.1590/S1516-635X2003000200006	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Poultry Science  v.5 n.2 2003	
Fonte: 	info:eu-repo/semantics/openAccess