Data/hora: 03/06/2024 01:21:33

Provedor de dados: 	63	
País: 	Brazil	
Título: 	Ruminal degradability of hard or soft texture corn grain at three maturity stages	
Autores: 	Pereira,Marcos Neves; Von Pinho,Renzo Garcia; Bruno,Ralph Guilherme da Silva; Calestine,Gabriela Arruda.	
Data: 	2004-01-01	
Ano: 	2004	
Palavras-chave: 	Vitreousness; Endosperm; Dent corn; Flint corn; Rumen.	
Resumo: 	The predominance of vitreous endosperm in hard texture flint corn (Zea mays L.) can decrease ruminal starch digestion comparatively to the farinaceous endosperm of dent corn, reducing energy content of the grain. The objective of this experiment was to evaluate the effects of texture and maturity stage on ruminal degradability of corn grain. Two dent and two flint hybrids were harvested at the early dent, half milk line, and black layer stages. The proportion of vitreous endosperm (vitreousness) in dent hybrids was 44.3%, while in flint it was 67.0%. There was a linear increase in vitreousness with advancing maturity. Flint hybrids at the early dent stage were more vitreous than dent at the black layer stage. The increase in vitreousness per maturation day was greater for flint hybrids. Grains were incubated in situ in the rumen of 6 cows. The 24-hour ruminal dry matter degradation was 63.3% for dent corn and 52.4% for flint corn. The 72-hour incubation residues of dent and flint hybrids were 7.6% and 15.6%, respectively. Ruminal degradability was similar between hybrids at the early dent and half milk line stages. There was a marked texture effect on ruminal degradability at the black layer stage (quadratic effect of maturity stage and interaction between texture and maturity stage). Use of dent hybrids, compared to flint hybrids, may result in smaller relative reduction in ruminal starch digestion in situations of late grain harvesting.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400002	
Editor: 	São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"	
Relação: 	10.1590/S0103-90162004000400002	
Formato: 	text/html	
Fonte: 	Scientia Agricola  v.61 n.4 2004	
Fonte: 	info:eu-repo/semantics/openAccess