The number of weane d pigs per sow and year is of great e conomic importance to commercial pig production. In practice, selection for fertility has been performed by independent culling levels, without visible success (Skjervold, 1978, Simonsson, 1978). Genetic parameters of sow fertility were first estimated by Korkman (1947) from Swedish field data. Since then dramatic changes in feeding and management have taken place. Also there have been large genetic changes in pigs due to selection for production traits. This study was undertaken to estimate the basic genetic parameters for fertility traits in Swedish breeding herds to determine the possibilities of improving litter size through selection.

K. Johansson, B. W Kennedy

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 503–508, 1982
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