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Multi-trait selection indexes for sustainable UK hill sheep production

Published online by Cambridge University Press:  18 August 2016

J. Conington ,
S.C. Bishop ,
B. Grundy ,
A. Waterhouse  and
G. Simm
J. Conington*
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
S.C. Bishop
Affiliation:
Roslin Institute, Roslin, Midlothian EH25 9PS, UK
B. Grundy
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
A. Waterhouse
Affiliation:
Scottish Agricultural College, Auchincruive, Ayr KA6 5HW, UK
G. Simm
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
*
†Email :j.conington@ed.sac.ac.uk
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Abstract

Three selection indexes for the UK hill sheep sector are derived to suit the extremes of hill production systems. These are: (i) intensive, where all surplus lambs not required for breeding are finished for slaughter, (ii) extensive, where all surplus ‘store’ lambs are sold to other farmers for finishing, and (iii) semi-intensive, which is intermediate between the two extremes, i.e. farms finish some lambs for slaughter and sell others as store lambs. Parameters for 12 breeding goal and index traits were estimated using a total of 3962 lamb records and 5944 ewe lambing records from Scottish Blackface sheep on two Scottish Agricultural College experimental hill farms. The breeding goal comprised carcass, maternal and survival traits. The evaluation of these indexes showed that improvements in maternal traits are possible, along with more modest improvements in carcass quality traits. Responses to selection are expected to be lower for the extensive farm in general, compared with the intensive farm. Evaluations of alternative indexes show that an index using measurements of fat and muscle on ewes rather than on lambs may be more cost-effective to implement in practice, compared with the original index, although this change results in a higher (i.e. undesirable) gain in mature size. Sensitivity analyses showed that in general, the indexes are robust to changes in economic values and to changes in heritability estimates.

Keywords

carcass compositionmaternal effectsselection indexsheep.
Type
Breeding and genetics
Information
Animal Science , Volume 73 , Issue 3 , December 2001 , pp. 413 - 423
Copyright
Copyright © British Society of Animal Science 2001

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