Data/hora: 03/06/2024 11:36:19

Provedor de dados: 	63	
País: 	Brazil	
Título: 	Days on feed and sex effects on live weight and carcass traits measured by ultrasound	
Autores: 	Silva,Saulo da Luz e; Titto,Evaldo Antonio Lencioni; Leme,Paulo Roberto; Martello,Luciane Silva; Pereira,Angélica Simone Cravo; Titto,Rafael Martins; Nogueira Filho,José Carlos Machado; Luchiari Filho,Albino.	
Data: 	2005-10-01	
Ano: 	2005	
Palavras-chave: 	Backfat thickness; Beef; In vivo evaluation; Ribeye area.	
Resumo: 	There is a paucity of information in the literature on body composition changes in Nellore cattle and its crosses, mainly on heifers and intact males. Ultrasound is a useful, low cost tool to easily obtain this information, with minimal animal stress. Effects of sex and days on feed on live weight (LW) and ultrasound Longissimus muscle area (ULMA) and subcutaneous fat thickness (UFAT) measurements were evaluated in F1 Piedmont &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; Nelore, 27 heifers (HF) and 27 intact males (IM). HF and IM had an initial LW of 256 ± 5.6 and 265 ± 5.6 kg, respectively, and were fed a diet containing 77% TDN for 131 days. LW, ULMA, and UFAT were evaluated at 28-d intervals. Interactions between sex and days on feed were found for all traits studied. LW increased linearly with days on feed, and IM had greater LW than HF throughout the trial. Mean initial ULMA was 55.8 and 55.5 cm² for HF and IM, respectively, and increased linearly until the end of the experiment (78.7 and 82.8 cm², respectively). IM showed higher ULMA than HF only in the last measurement. Initial UFAT averaged 0.04 and 0.4 mm for IM and HF, respectively, and increased linearly during the feeding period (2.4 and 4.3 mm, respectively). UFAT was higher n HF than in IM during the entire experimental period. IM showed faster growth rates and protein accretion than HF in the Longissimus muscle. HF showed faster subcutaneous fat accretion.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500002	
Editor: 	São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"	
Relação: 	10.1590/S0103-90162005000500002	
Formato: 	text/html	
Fonte: 	Scientia Agricola  v.62 n.5 2005	
Fonte: 	info:eu-repo/semantics/openAccess