<XML><RECORDS><RECORD><REFERENCE_TYPE>0</REFERENCE_TYPE><REFNUM>8077</REFNUM><AUTHORS><AUTHOR>McFarlane,N.J.B.</AUTHOR><AUTHOR>Wu,J.</AUTHOR><AUTHOR>Tillett,R.D.</AUTHOR><AUTHOR>Schofield,C.P.</AUTHOR><AUTHOR>Siebert,J.P.</AUTHOR><AUTHOR>Ju,X.</AUTHOR></AUTHORS><YEAR>2005</YEAR><TITLE>Shape measurements of live pigs using 3D image capture</TITLE><PLACE_PUBLISHED>Journal of Animal Science</PLACE_PUBLISHED><PUBLISHER>N/A</PUBLISHER><LABEL>McFarlane:2005:8077</LABEL><KEYWORDS><KEYWORD>Pigs</KEYWORD></KEYWORDS<ABSTRACT>A photogrammetric stereo imaging system was used to capture 3D 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 3D 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 3D 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 -66% correlation with the flatness-of-back shape parameter, and a 64% correlation with weight.</ABSTRACT><NOTES>Accepted for publication</NOTES></RECORD></RECORDS></XML>