Influence of the Biochemical and Physical Characteristics of the Maize Grain on Ruminal Starch Degradation

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• 作者：Christelle Philippeau ; Jacques Landry ; and Brigitte Michalet-Doreau
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：1998
• 出版时间：October 1998
• 年：1998
• 卷：46
• 期：10
• 页码：4287 - 4291
• 全文大小：56K
• 年卷期：v.46,no.10(October 1998)
• ISSN：1520-5118

文摘

This study was aimed at determining the influence of biochemical and physical features of the maizegrain on ruminal starch degradation using genotypes differing in the texture of the endosperm (dentor flint) and in the starch composition (waxy [wx], normal [+], amylose extender [ae]). Ruminalstarch degradation was (1) highest for dent types, (2) highest for (ae) strains irrespective the texture,and (3) dependent on the texture for (wx) strains. Ruminal starch degradation was independent ofthe amylose:amylopectin ratio in starch. The slowly degradable starch fraction which reflects thepotentially degradable starch fraction that would be degraded by microorganisms given sufficientresidence time in the rumen was negatively linked to the true glutelins including in the proteinmatrix. Ruminal starch degradability was also related to the proportion of coarse particles (1000> d > 400 m), which is an estimator of grain hardness.Keywords: Maize; genotype; ruminal digestion; starch; protein