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reproductive performance and foot lesions in swine' Can. J. Anim. Sci. 60: 96r-969.Two experiments, using 231 gilts and primi-parous sows of Lacombe and Yorkshire breeding, were conducted during the winter and summer months to study the effect of biotin supplementation (200 and 300 ptglkg in exps. 1 and 2) of barley-wheat-soy gestation and lactation diets on reproductive performance and incidence of foot lesions in swine. The control and supplemented groups did not significantly differ in weight change during gestation or lactation in either breed. The number of pigs born a1ive, mean birth weight (kg), 2 I -day weight gain (kg) and number of pigs weaned (5 wk)perlitterwere9. 18, 1.38,4.15,8.0and8.9'7,1.35,4.l4,and7.6,respectively' for control and supplemented groups and did not differ significantly between treatments. The time to post-weaning estrus was similar (7 .62 vs. 7