Lactational oestrus can be induced using piglet separation and/or boar exposure in multiparous commercial breeding sows

摘要

A commercially acceptable lactational oestrus induction protocol could be used to modify current weaning and mating management systems within the pork industry. Piglet separation and boar exposure during lactation have previously resulted in an 85% pregnancy rate (Downing et al., 2009). A suitable induction protocol can potentially delay weaning, increase weight gain of piglets after weaning (Thompson et al., 1981), and help in the management of 'weaner setback'. Our hypothesis was that from d 21 oflactation, either full boar contact or piglet separation for 8h/d for 3 d will be sufficient to induce oestrus.