Effects of dietary carbohydrate sources on degradation kinetics of nitrogen from plant protein sources in the rumen

✍ Scribed by Cristina M Guedes; Arnaldo Dias-da-Silva

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 150 KB
• Volume: 85
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/jsfa.2196

✦ Synopsis

Abstract

The effects of the nature of carbohydrate source on in sacco protein degradation of 15 samples of plant protein sources were studied in four mature fistulated rams fed a control diet (C) of meadow hay and soyabean meal (83:15 on dry matter basis) and three diets in which 36, 34 or 40% of diet dry matter was sugar beet pulp, maize or wheat (diets P, M and W respectively). Degradation parameters were estimated from the exponential equation p = a + b[1 − exp(−ct)]. Diet composition significantly affected (P < 0.001) all the degradation parameters, the effect being more pronounced on the degradation rate (c). This parameter was stimulated (P < 0.05) by beet pulp but depressed (P < 0.05) by cereal inclusion in the diets, in particular when animals were fed the W diet (4.46, 5.65, 3.74 and 3.05% h^−1^ for the C, P, M and W diets respectively). An interaction effect between carbohydrate source and incubated plant protein sources was observed (P < 0.001). The reason(s) for these differential effects were not elucidated. The practical consequences of these findings are discussed. Copyright © 2005 Society of Chemical Industry