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Influence of boar contact on attainment of puberty in gilts after removal of the olfactory bulbs

Summary. At 6–7 weeks of age the olfactory bulbs were removed from gilts which were then exposed to vasectomized boars for 30 min/day, starting on Day 160. Mean ± s.e.m. age at first oestrus was similar in these gilts (230 ± 15 days) to that in intact gilts not exposed to a boar (234 ± 8 days) but greater (P < 0·05) than for sham- and un-operated gilts exposed to a boar (204 ± 3 and 208 ± 9 days, respectively). There were no differences in growth rate or ovulation rate at first oestrus. It is concluded that the main stimulus involved in the boar effect is olfactory in nature.