Condensed tannins are only partially responsible for variations in nutrient digestibilities of sorghum grain cultivars

被引:63
作者
Elkin, RG
Freed, MB
Hamaker, BR
Zhang, Y
Parsons, CM
机构
[1] PURDUE UNIV, DEPT FOOD SCI, W LAFAYETTE, IN 47907 USA
[2] UNIV ILLINOIS, DEPT ANIM SCI, URBANA, IL 61801 USA
关键词
sorghum; tannin; amino acid digestibilities; true metabolizable energy; TME(n); pepsin digestibility; chicken;
D O I
10.1021/jf950489t
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Nitrogen-corrected true metabolizable energy (TME(n)) and true amino acid digestibility values were determined, using cecectomized cockerels, for 20 sorghum [Sorghum bicolor (L.) Moench] cultivars that ranged in catechin equivalent (CE) percentages from 0 to 3.88. There were significant (P less than or equal to 0.01) overall inverse relationships between CE content and (1) the individual digestibilities of lysine, methionine, threonine, isoleucine, leucine, valine, phenylalanine, histidine, and arginine; (2) the mean digestibility of essential amino acids; (3) the mean digestibility of nonessential amino acids; and (4) TME(n) values. In contrast to these overall trends, several cultivars of similar condensed tannin content had markedly different nutrient digestibilities. The dissimilarity of protein digestibilities in sorghum genotypes of similar tannin content was confirmed by subjecting samples of the ground grains to in vitro pepsin digestion with subsequent visualization of the undigested proteins by SDS-PAGE. The present work suggests that other components besides tannins are responsible for variations in the availability of nutrients in sorghum.
引用
收藏
页码:848 / 853
页数:6
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