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The influence of level of grain intake on protein digestion in the intestine of cattle

Published online by Cambridge University Press:  06 August 2007

T. S. Neudoerffer ,
P. A. Leadbeater ,
F. D Horney  and
H. S Bayley
T. S. Neudoerffer
Affiliation:
Departments of Nutrition and Clinical Studies, University of Guelph, Guelph, Ontario, Canada
P. A. Leadbeater
Affiliation:
Departments of Nutrition and Clinical Studies, University of Guelph, Guelph, Ontario, Canada
F. D Horney
Affiliation:
Departments of Nutrition and Clinical Studies, University of Guelph, Guelph, Ontario, Canada
H. S Bayley
Affiliation:
Departments of Nutrition and Clinical Studies, University of Guelph, Guelph, Ontario, Canada
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Abstract

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1. Protein digestion in the gastro-intestinal tract of cattle receiving diets with either low or high content of maize was investigated. Digesta obtained from the duodenum and ileum were separated into three fractions; soluble, microbial and particulate, and the amino acid composition of the three fractions and that of the total digesta were determined. The proportion of particulate material digested in the intestine was less from the high-maize than from the low-maize diet, but more of the particulate fraction entered the duodenum from the high-maize than from the low-maize diet, so the absolute amount of particulate fraction which was digested was greater for the high-maize diet.

2. More protein was digested in the rumen from the low-maize diet (high-roughage) than from the other diet. Total digestion of protein from the low-maize diet was also higher.

3. Although more protein from the high-maize than from the low-maize diet reached the duodenum, the protein from the low-maize diet was more digestible in the intestine, so the total amount of dietary protein digested in the intestine was the same for both rations.

Type
Research Article
Information
British Journal of Nutrition , Volume 25 , Issue 3 , May 1971 , pp. 343 - 350
Copyright
Copyright © The Nutrition Society 1971

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