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Objective assessment of lamb conformation: reliability of body measurements determined by computer image analysis

Published online by Cambridge University Press:  05 November 2021

S. Al-Shami  and
I. Ap Dewi
S. Al-Shami
Affiliation:
School of Agricultural and Forest Sciences, University of Wales Bangor, Bangor, Gwynedd, LL57 2UW, UK
I. Ap Dewi
Affiliation:
School of Agricultural and Forest Sciences, University of Wales Bangor, Bangor, Gwynedd, LL57 2UW, UK
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Extract

A method to determine body measurements by computer image analysis of lamb photographs was described by Komlosi (1994). It was suggested that the technique could be used to predict conformation of live sheep, particularly candidate breeding rams. This study was conducted to evaluate the reliability of lamb body measurements derived using this technique.

Thirty lambs (Border Leicester (4), Texel (16), Suffolk (10)) were used. Reliability estimates were obtained from repeated (5 replications) photographs of the same animals and from repeated measurements (4 replications) of individual photographs. Eight lamb body measurements were used in this study namely, body length (BL), height at withers (HW), height at hip (HHP), hind-quarter horizontal distance (HQH), hind-quarter diagonal distance (HQD), hind quarter area (HQA), side area (SA) and rump diagonal (RUD). These measurements are as described by Komlosi (1994).

Type
Animal Breeding
Information
Proceedings of the British Society of Animal Science , Volume 1996 , March 1996 , pp. 106
Copyright
Copyright © The British Society of Animal Science 1996

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References

Komlosi, I. 1994. The application of computer image analysis to predict conformation in sheep. PhD. Thesis. University of Wales Bangor, Bangor, Gwynedd, UK.Google Scholar
Lardis, J.R. and Koch, G. 1975. A review of statistical methods in the analysis of data arising from observer reliability studies (Part 1). Statistica Neerlandica 29: 101–123.Google Scholar