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The effect of footrot on weight gain in sheep

Published online by Cambridge University Press:  01 October 2008

G. J. Nieuwhof ,
S. C. Bishop ,
W. G. Hill  and
H. W. Raadsma
G. J. Nieuwhof*
Affiliation:
Meat and Livestock Commission, PO Box 44, Milton Keynes MK6 1AX, UK Roslin Institute and Royal (Dick) School of Veterinary Studies, Roslin BioCentre, Midlothian EH25 9PS, UK
S. C. Bishop
Affiliation:
Roslin Institute and Royal (Dick) School of Veterinary Studies, Roslin BioCentre, Midlothian EH25 9PS, UK
W. G. Hill
Affiliation:
University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK
H. W. Raadsma
Affiliation:
Centre for Advanced Technologies in Animal Genetics and Reproduction (Reprogen), Faculty of Veterinary Science, University of Sydney, PMB 3, Camden, NSW 2570, Australia
*
E-mail: [email protected]
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Abstract

Footrot is a highly contagious bacterial disease of sheep affecting the interdigital skin and surrounding soft and hard horn of a hoof, often resulting in severe lameness. This study was aimed at estimating the effect of footrot on weight gain of affected animals, and characterising the variation between animals in terms of phenotypic, environmental and genetic components. A general approach was developed describing the relationship between the disease and weight gain, defining new traits such as the maximum weight loss as a result of disease and the time after infection that this occurs. In two trials, 1267 Merino sheep were artificially challenged with footrot when 10 months old and re-infected through exposure to footrot on pasture 33 weeks later. Their feet were scored for footrot and live weights were measured approximately every 3 weeks. From data on animals that were not affected by footrot throughout each trial, normal growth curves were calculated and applied to affected animals to predict their growth had they remained healthy, so that weight loss as a result of footrot could be predicted. Animals with average footrot severity in the two trials suffered weight losses of 0.5 to 2.5 kg live weight, but most animals regained lost live weight later in the trials as footrot healed following vaccination. The estimates of the heritabilities of weight loss, adjusted for the severity of footrot, were about 0.30 and 0.15 in the experimental and natural challenge groups, respectively. Animals with higher genotypic values for weights at the start of each trial appeared to cope better with infections, in terms of lower weight losses. The time of highest footrot score and the time of maximum weight loss after infection had only very small genetic components.

Keywords

sheepfootrotweight losscompensatory growthgenetics
Type
Full Paper
Information
animal , Volume 2 , Issue 10 , October 2008 , pp. 1427 - 1436
Copyright
Copyright © The Animal Consortium 2008

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