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Postweaning Genetic Parameters and Indexes for Swine^{1 ,2,}

The Ohio Agricultural Research and Development Center, Wooster 44691 and The Ohio State University, Columbus 43210

Abstract

Data were analyzed on 5,952 pigs tested at the Ohio Swine Evaluation Station to estimate genetic parameters and compare testing strategies for selection for postweaning net merit. Net merit was defined as feed consumed from 20 to 90 kg, days to 90 kg and percentage lean cuts at 90 kilograms. Genetic parameters agreed well with those previously published. Theoretical examination of several indexes suggested that most breeders should test their pigs in groups on-the-farm and use an index combining growth and leanness. Approximately 10% improvement in changing net merit should result from measuring feed consumption. This could be worthwhile in testing stations and elite herds. Testing two littermate boars in a pen had a 6% advantage in predicting net merit compared to testing a single boar. Use of central test facilities for testing sibs to obtain slaughter data would not be recommended.

¹ Published with the approval of the director as Paper No. 114-78, Journal Series, The Ohio Agricultural Research and Development Center.

² Contributing project to NC-103, Genetic Improvement of Efficiency in the Production of Quality Pork.

³ This paper contains part of the dissertation presented by Dr. Isler to the Graduate School, The Ohio State University.

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