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Ruminal fermentation, methanogenesis and nitrogen utilization of sheep receiving tropical grass hay-concentrate diets offered with Sapindus saponaria fruits and Cratylia argentea foliage

Published online by Cambridge University Press:  18 August 2016

H. D. Hess*
Affiliation:
Institute of Animal Science, Animal Nutrition, Swiss Federal Institute of Technology (ETH), ETH Centre/LFW, CH-8092 Zurich, Switzerland
R. A. Beuret
Affiliation:
Institute of Animal Science, Animal Nutrition, Swiss Federal Institute of Technology (ETH), ETH Centre/LFW, CH-8092 Zurich, Switzerland
M. Lötscher
Affiliation:
Institute of Animal Science, Animal Nutrition, Swiss Federal Institute of Technology (ETH), ETH Centre/LFW, CH-8092 Zurich, Switzerland
I. K. Hindrichsen
Affiliation:
Institute of Animal Science, Animal Nutrition, Swiss Federal Institute of Technology (ETH), ETH Centre/LFW, CH-8092 Zurich, Switzerland
A. Machmüller
Affiliation:
Institute of Animal Science, Animal Nutrition, Swiss Federal Institute of Technology (ETH), ETH Centre/LFW, CH-8092 Zurich, Switzerland
J. E. Carulla
Affiliation:
Department of Animal Production, National University of Colombia, Bogotá, Colombia
C. E. Lascano
Affiliation:
Tr opical Grass and Legume Project, CIAT, Cali, Colombia
M. Kreuzer
Affiliation:
Institute of Animal Science, Animal Nutrition, Swiss Federal Institute of Technology (ETH), ETH Centre/LFW, CH-8092 Zurich, Switzerland
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Abstract

The effects of supplementing a tropical, low-quality grass hay (Brachiaria dictyoneura) with legume foliage (Cratylia argentea) or fruits of the multipurpose tree Sapindus saponaria on ruminal fermentation, methane release and nitrogen (N) utilization were evaluated. Six Swiss White Hill lambs were used in a 6 ✕ 6 Latin-square design with a 3 ✕ 2 factorial arrangement of treatments with measurements of energy metabolism being conducted using open-circuit respiratory chambers. Treatments consisted of three basal diets, either grass alone or legume: grass ratios of 1: 2 or 2: 1. These basal diets were supplemented (1: 3) with a control concentrate or with a concentrate containing 250 g/kg dry matter of S. saponaria fruits. The apparent total tract digestibilities of organic matter (OM) and neutral-detergent fibre (NDF) were reduced and the proportionate crude protein (CP) losses through faeces were increased (P 0·01) by supplementation with S. saponaria, and digestibilities of OM and NDF were linearly reduced (P 0·001) with increasing legume proportion. Body energy retention, however, was similar in all diets. Along with CP intake, the proportionate CP losses through faeces decreased (P 0·001) with increasing legume proportion which was associated with improved (P 0·001) body protein retention and reduced (P 0·1) fat retention. Ruminal fluid ammonia concentration was not significantly affected (P > 0·1) by the inclusion of S. saponaria in the concentrate, but increased linearly (P 0·001) as dietary legume proportion was elevated. Supplementation with fruits of S. saponaria increased (P 0·01) total bacteria count, and decreased (P 0·001) total ciliate protozoa count by more than proportionately 0·50. Daily methane release was reduced (P 0·01) by S. saponaria supplementation in all basal diet types. Although being not clearly affected on a daily basis, methane release relative to body protein retention decreased linearly (P 0·05) with increasing legume proportion. The fact that interactions were mostly non-significant (P > 0·05) indicates that supplementation with S. saponaria fruits is a useful means to reduce methane emission from sheep given both tropical grass-based and grass-legume-based diets. Likewise, including legumes in N-limited tropical diets seems to represent an environmentally friendly way to improve animal productivity.

Type
Ruminant nutrition, behaviour and production
Copyright
Copyright © British Society of Animal Science 2004

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