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Effect of ammonia treatment of barley straw on the dynamics of its degradation in the rumen

Published online by Cambridge University Press:  25 May 2016

M. Fondevila ,
C. Castrillo ,
J. Gasa  and
J. A. Guada
M. Fondevila
Affiliation:
Departmento de Productión Animal y Ciencia de los Alimentos, Universidad de Zaragoza, Zaragoza, Spain
C. Castrillo
Affiliation:
Departmento de Productión Animal y Ciencia de los Alimentos, Universidad de Zaragoza, Zaragoza, Spain
J. Gasa
Affiliation:
Departmento de Productión Animal y Ciencia de los Alimentos, Universidad de Zaragoza, Zaragoza, Spain
J. A. Guada
Affiliation:
Departmento de Productión Animal y Ciencia de los Alimentos, Universidad de Zaragoza, Zaragoza, Spain
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Abstract

Two experiments were designed to examine the effects of ammonia treatment of barley straw on rumen environmental conditions for fibre degradation, and to determine the effect of treatment on the soluble and insoluble fractions of straw. In experiment 1, rumen pH, and ammonia-nitrogen and volatile fatty acid concentrations in the rumen of sheep receiving untreated (US1) or ammonia-treated (TS1) straw were recorded. Also, both straws were incubated in the rumen of both groups of animals. There were no significant differences (P > 0·05) within rumen parameters, except for butyrate proportion, which was higher (P < 0·01) with TS1. Dry matter and neutraldetergent fibre disappearances of TS1 were higher (P < 0·001) than those of US1 at all the incubation times. Degradation of both straws in US1-fed sheep was not smaller, and in some periods of incubation was even greater, than in TS1-fed animals. In experiment 2, samples of untreated (US2) and treated (TS2) straw were incubated in wethers offered a mixture (50:50) of alfalfa hay and straw. Samples of US2 and TS2 were soaked in autoclaved rumen fluid to measure their solubility. It was clear that, although treatment increased the soluble fraction of US2 and TS2 by 52 and 65 g/kg respectively, from 0 to 72 h of incubation, increasing the differences between straws from 45 to 58 g/kg in that period, actual microbial action on the treated roughage was the more important factor, accounting for a difference between US2 and TS2 of 131 g/kg after 72 h incubation.

Keywords

ammonia treatmentrumen degradationstraw
Type
Research Article
Information
Animal Production , Volume 57 , Issue 3 , December 1993 , pp. 407 - 413
Copyright
Copyright © British Society of Animal Science 1993

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