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Defining the breeding goal for a sheep breed including production and functional traits using market data

Published online by Cambridge University Press:  16 November 2017

A. Theodoridis ,
A. Ragkos ,
G. Rose ,
D. Roustemis  and
G. Arsenos
A. Theodoridis*
Affiliation:
School of Veterinary Medicine, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
A. Ragkos
Affiliation:
Agricultural Economics Research Institute, ELGO Demeter, Terma Alkmanos Str. 11528, Athens, Greece
G. Rose
Affiliation:
School of Veterinary Medicine, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
D. Roustemis
Affiliation:
Center of Animal Genetic Improvement, 57011, Nea Mesimvria, Greece
G. Arsenos
Affiliation:
School of Veterinary Medicine, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
*
†E-mail: alextheod@vet.auth.gr
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Abstract

In this study, the economic values for production and functional traits of dairy sheep are estimated through the application of a profit function model using farm-level technical and economic data. The traits incorporated in the model were milk production, prolificacy, fertility, milking speed, longevity and mastitis occurrence. The economic values for these traits were derived as the approximate partial derivative of the specified profit function. A sensitivity analysis was also conducted in order to examine how potential changes in input and output prices would affect the breeding goal. The estimated economic values of the traits revealed their economic impact on the definition of the breeding goal for the specified production system. Milk production and fertility had the highest economic values (€40.30 and €20.28 per standard genetic deviation (SDa)), while, mastitis only had a low negative value of −0.57 €/SDa. Therefore, breeding for clinical mastitis will have a minor impact on farm profitability because it affects a small proportion of the flock and has low additive variance. The production traits, which include milk production, prolificacy and milking speed, contributed most to the breeding goal (70.0%), but functional traits still had a considerable share (30.0%). The results of this study highlight the importance of the knowledge of economic values of traits in the design of a breeding program. It is also suggested that the production and functional traits under consideration can be categorized as those which can be efficiently treated through genetic improvement (e.g. milk production and fertility) while others would be better dealt with through managerial interventions (e.g. mastitis occurrence). Also, sub-clinical mastitis that affects a higher proportion of flocks could have a higher contribution to breeding goals.

Keywords

Breeding goalChios sheepdairy ewesprofit functioneconomic values
Type
Research Article
Information
animal , Volume 12 , Issue 7 , July 2018 , pp. 1508 - 1515
Copyright
© The Animal Consortium 2017 

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