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Diet effects on methane production by goats and a comparison between measurement methodologies

Published online by Cambridge University Press:  08 August 2008

R. BHATTA ,
O. ENISHI ,
N. TAKUSARI ,
K. HIGUCHI ,
I. NONAKA  and
M. KURIHARA
R. BHATTA*
Affiliation:
Energy Metabolism Laboratory, National Institute of Livestock and Grassland Science, Tsukuba, Japan
O. ENISHI
Affiliation:
Energy Metabolism Laboratory, National Institute of Livestock and Grassland Science, Tsukuba, Japan
N. TAKUSARI
Affiliation:
Energy Metabolism Laboratory, National Institute of Livestock and Grassland Science, Tsukuba, Japan
K. HIGUCHI
Affiliation:
Energy Metabolism Laboratory, National Institute of Livestock and Grassland Science, Tsukuba, Japan
I. NONAKA
Affiliation:
Energy Metabolism Laboratory, National Institute of Livestock and Grassland Science, Tsukuba, Japan
M. KURIHARA
Affiliation:
Energy Metabolism Laboratory, National Institute of Livestock and Grassland Science, Tsukuba, Japan
*
*To whom all correspondence should be addressed. Email: ragha0209@yahoo.com
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Summary

A series of studies were carried out to measure the methane (CH4) production by Japanese goats fed 19 different diets (D1–D19) varying in nutritive composition in the open circuit respiration chamber (RC) and to compare them with CH4 estimated by the in vitro gas production test (IVGPT). Adult Japanese goats (>2 years old) with a mean body weight of 26±5·4 kg were used in these experiments. Each diet was fed to four randomly selected goats and feeding was carried out at 1·1 maintenance (M) as per National Research Council (NRC) (1981) for goats. Average CH4 emission by goats in the RC ranged from 0·23 to 0·39 (mean value 31 ml/g dry matter intake (DMI)); when it was expressed as a proportion of gross energy or, with methane conversion rate (MCR), it ranged from 5·0 to 8·2, with an average of 6·6. Incorporation of by-products like sweet potato vine silage (SPVS) (P=0·016), dried pumpkin (P=0·052) and brewers' grain in the diet suppressed (P<0·01) methanogenesis in goats, when compared with that of standard farm diet (D1). The CH4 output measured in the RC was very close to that estimated from the gas collected after 24 h and higher after 48 h of in vitro incubation. Although composition of the diets' acid detergent fibre (ADF) had a significant effect on methane emission, methane output estimated by IVGPT was very close to that measured in the RC demonstrating that this system could be used to estimate the CH4 production potential from diets in preparing a database and also in the planning of mitigation strategies in small ruminants to improve their performance as well as to reduce greenhouse gas emissions.

Type
Animals
Information
The Journal of Agricultural Science , Volume 146 , Issue 6 , December 2008 , pp. 705 - 715
Copyright
Copyright © 2008 Cambridge University Press

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