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Shape measurements of live pigs using 3-D image capture

Published online by Cambridge University Press:  09 March 2007

N. J. B. McFarlane ,
J. Wu ,
R. D. Tillett ,
C. P. Schofield ,
J. P. Siebert  and
X. Ju
N. J. B. McFarlane*
Affiliation:
BBSRC Silsoe Research Institute, Wrest Park, Bedford MK45 4HS, UK
J. Wu
Affiliation:
BBSRC Silsoe Research Institute, Wrest Park, Bedford MK45 4HS, UK
R. D. Tillett
Affiliation:
BBSRC Silsoe Research Institute, Wrest Park, Bedford MK45 4HS, UK
C. P. Schofield
Affiliation:
BBSRC Silsoe Research Institute, Wrest Park, Bedford MK45 4HS, UK
J. P. Siebert
Affiliation:
Department of Computer Science, Boyd Orr Building, University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
X. Ju
Affiliation:
Department of Computer Science, Boyd Orr Building, University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
*
†E-mail: nigel.mcfarlane@SilsoeResearch.org.uk
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Abstract

A photogrammetric stereo imaging system was used to capture 3-D models of live pigs, and quantitative shape measurements were extracted from cross sections of the models. Stereo images were captured of 32 pigs, divided into high-lysine and low-lysine diet groups, and 3-D models were built from the images. Each pig was imaged once per week for 14 weeks. After slaughter, 10 of the pigs were dissected for muscle and fat measurements. A sequence of algorithms was applied to the 3-D models: differential geometry to reveal surface curvature features and detect the spine; manual landmark placement; fitting a curve to the spine; determining the vertical axis of the body; placing a slice plane across the abdomen close to the P2 position; extracting a cross section; and fitting a shape model to the cross section. Differential geometry revealed many qualitative features of the musculature. The spine was a line of minimum curvature along the back. The high-lysine pigs had higher height-to-width ratios and flatter backs than the low-lysine pigs. The dissected total muscle mass had a -0·66 correlation with the flatness-of-back shape parameter, and a 0·64 correlation with weight.

Keywords

imagerymodelspigsshape
Type
Research Article
Information
Animal Science , Volume 81 , Issue 3 , December 2005 , pp. 383 - 391
Copyright
Copyright © British Society of Animal Science 2005

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