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The effect of dietary crude protein content on apparent and true ileal nitrogen and amino acid digestibilities

Published online by Cambridge University Press:  09 March 2007

A. Donkoh  and
P. J. Moughan
A. Donkoh
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
P. J. Moughan
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
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Abstract

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The effect of dietary protein content (25, 60, 95, 130, 165 and 200 g crude protein (N × 6.25)/kg diet) on the apparent and true ileal digestibilities of N and amino acids in meat-and-bone meal given to the growing rat was investigated. Semi-synthetic diets in which meat-and-bone meal was the sole protein source were given to 180 g body-weight rats for 14 d. On the fourteenth day the rats were fed and then killed 4 h after the start of feeding and digesta were sampled from the terminal 200 mm ileum. Endogenous amino acid excretion was determined for eighteen rats given an enzymically hydrolysed casein (EHC)-based diet and with subsequent treatment of the digesta using ultrafiltration. The EHC-fed rats were killed 3 h after the start of feeding and digesta were collected from the terminal 200 mm ileum. True ileal digestibility values determined with reference to Cr as a marker were higher than the corresponding apparent estimates. Apparent digestibility values of N and amino acids increased significantly (P < 0.001) with increasing dietary protein level; however, dietary protein content had no significant (P > 0.05) effect on the true ileal digestibilities of N and amino acids. The mean apparent ileal digestibility of N in meat-and-bone meal ranged from 65.6 to 75.3%. The corresponding range for the true ileal digestibility of N was 76.9 to 78.2%. True ileal digestibility, unlike apparent digestibility, appears to be independent of dietary protein level and may allow feed ingredients to be compared accurately even if they are ingested in different quantities.

Keywords

Ileal digestibilityProteinMeat-and-bone mealRat
Type
Dietary protein effects on protein turnover
Information
British Journal of Nutrition , Volume 72 , Issue 1 , July 1994 , pp. 59 - 68
Copyright
Copyright © The Nutrition Society 1994

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