Control and SL sows were taken for a short walk daily during which a backpressure test was
performed in the absence of a boar. Oestrus expression within 26 days of farrowing was
significantly higher in BC (67%) and BC + SL (93%) sows than control (11%) and SL (13%)
sows (P < 0.05). Of sows mated within 26 days of farrowing