The effect of feeding and reproductive performance on the alternate year calving rate in cheju native cattle iii. the effect of different levels of supplementary feeding on the reproductive performance in cheju native cows
Kim, J.K.; Kim, M.C.; Kim, S.C.
Korean Journal of Animal Science 27(5): 265-269
This investigation was conducted to find the effect of different levels of supplementary feeding on reproductive performance and calving disorders. Six hundred Cheju native and Cheju crossbred cows were divided into three groups (A, B and C) and fed different levels of supplementary feed. 1. The age of first insemination of heifer in group A (fed over 1 kg/day of various brans) was 2-7 months earlier than those of group B (less than 1 kg/day of various brans) and group C (hay only). 2. The first calving age in groups (A and B) was 6-7 months earlier than cows in group C. 3. The calving interval in groups A and B was reduced by 3 months and the recurrence of estrus after parturition was 20 days earlier than cows in group C. There was, however, no significant difference in estrus cycle and gestation period when cows were fed different nutritional levels.