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Development of an in situ procedure to evaluate the reticulo-rumen morphology of sheep selected for divergent methane emissions

Published online by Cambridge University Press:  24 July 2018

S. J. Waite
Affiliation:
Auckland Bioengineering Institute, University of Auckland, Auckland 1010, New Zealand
J. Zhang
Affiliation:
Auckland Bioengineering Institute, University of Auckland, Auckland 1010, New Zealand
J. E. Cater
Affiliation:
Department of Engineering Science, University of Auckland, Auckland 1010, New Zealand
G. C. Waghorn
Affiliation:
Auckland Bioengineering Institute, University of Auckland, Auckland 1010, New Zealand Department of Engineering Science, University of Auckland, Auckland 1010, New Zealand AgResearch Invermay, Mosgiel 9092, New Zealand
W. E. Bain
Affiliation:
AgResearch Invermay, Mosgiel 9092, New Zealand
J. C. McEwan
Affiliation:
AgResearch Invermay, Mosgiel 9092, New Zealand
V. Suresh
Affiliation:
Auckland Bioengineering Institute, University of Auckland, Auckland 1010, New Zealand Department of Engineering Science, University of Auckland, Auckland 1010, New Zealand
Corresponding
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Abstract

Published studies have shown that methane yield (g CH4/kg dry matter) from sheep is positively correlated with the size (volume and surface area) of the reticulo-rumen (RR) and the weight of its contents. However, the relationship between CH4 yield and RR shape has not been investigated. In this work, shape analysis has been performed on a data set of computerised tomography (CT) scans of the RR from sheep having high and low CH4 yields (n=20 and n=17, respectively). The three-dimensional geometries of the RRs were reconstructed from segmented scan data and split into three anatomical regions. An iterative fitting technique combining radial basis functions and principal component (PC) fitting was used to create a set of consistent landmarks which were then used as variables in a PC analysis to identify shape variation within the data. Significant size differences were detected for regions corresponding to the dorsal and ventral compartments between sheep with high and low CH4 yields. When the analysis was repeated after scaling the geometries to remove the effect of size, there was no significant shape variation correlating with CH4 yield. The results have demonstrated the feasibility of CT-based computational shape determination for studying the morphological characteristics of the RR and indicate that size, but not shape correlates with CH4 yield in sheep.

Type
Research Article
Copyright
© The Animal Consortium 2018 

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Footnotes

a

Present address: 6 Berkley Avenue, Hamilton 3216, New Zealand.

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Development of an in situ procedure to evaluate the reticulo-rumen morphology of sheep selected for divergent methane emissions
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