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Integrating economic parameters into genetic selection for Large White pigs

Published online by Cambridge University Press:  28 March 2013

Bekezela Dube ,
Sendros D. Mulugeta  and
Kennedy Dzama
Bekezela Dube*
Affiliation:
Animal Science Programme, North West University, Private Bag X2046, Mmabatho 2735, South Africa
Sendros D. Mulugeta
Affiliation:
Animal Science Programme, North West University, Private Bag X2046, Mmabatho 2735, South Africa
Kennedy Dzama
Affiliation:
Department of Animal Sciences, Stellenbosch University, Private Bag X1, Matielend 7602, South Africa
*
†E-mail: Bekezela.Dube@nwu.ac.za
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Abstract

The objective of the study was to integrate economic parameters into genetic selection for sow productivity, growth performance and carcass characteristics in South African Large White pigs. Simulation models for sow productivity and terminal production systems were performed based on a hypothetical 100-sow herd, to derive economic values for the economically relevant traits. The traits included in the study were number born alive (NBA), 21-day litter size (D21LS), 21-day litter weight (D21LWT), average daily gain (ADG), feed conversion ratio (FCR), age at slaughter (AGES), dressing percentage (DRESS), lean content (LEAN) and backfat thickness (BFAT). Growth of a pig was described by the Gompertz growth function, while feed intake was derived from the nutrient requirements of pigs at the respective ages. Partial budgeting and partial differentiation of the profit function were used to derive economic values, which were defined as the change in profit per unit genetic change in a given trait. The respective economic values (ZAR) were: 61.26, 38.02, 210.15, 33.34, −21.81, −68.18, 5.78, 4.69 and −1.48. These economic values indicated the direction and emphases of selection, and were sensitive to changes in feed prices and marketing prices for carcasses and maiden gilts. Economic values for NBA, D21LS, DRESS and LEAN decreased with increasing feed prices, suggesting a point where genetic improvement would be a loss, if feed prices continued to increase. The economic values for DRESS and LEAN increased as the marketing prices for carcasses increased, while the economic value for BFAT was not sensitive to changes in all prices. Reductions in economic values can be counterbalanced by simultaneous increases in marketing prices of carcasses and maiden gilts. Economic values facilitate genetic improvement by translating it to proportionate profitability. Breeders should, however, continually recalculate economic values to place the most appropriate emphases on the respective traits during genetic selection.

Keywords

profitabilitygenetic selectionproduction systems
Type
Breeding and genetics
Information
animal , Volume 7 , Issue 8 , August 2013 , pp. 1231 - 1238
Copyright
Copyright © The Animal Consortium 2013 

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