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Pig Journal Volume: 54
Publication date: November 2004

Proceedings Section

THE RICHARD POTTER MEMORIAL LECTURE - THERE?S SOMETHING GOING THROUGH THE HERD?.. ANOTHER LOOK
J.D. Mackinnon

Abstract
Evidence in the form of field observations is presented to support an opinion that the most common predisposing factors of infertility in the breeding herd year on year are broadly seasonal. It is suggested that so-called seasonal infertility commences in the Spring and fertility levels are therefore sub-optimal for much of the year. There is considerable variation from farm to farm and this is thought to reflect differences in management practices. Intervention studies are notably lacking and, without investigation at regional or national level, producers will continue to be frustrated by low productivity.

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