Abstract
Sixteen multiparous Zebu cows ( Bos indicus) were randomly allocated to two nutritional treatment groups to determine the effect of urea-molasses-mineral block (UMMB) supplementation on body weight gain and resumption of ovarian cyclicity after calving. Supplementation of UMMB increased body weight by 4.8% (6.75 ± 1.86 kg) during the 3 month period after calving. In the control group, a loss of body weight was observed (7.1% and 9.19 ± 3.05 kg) in the same period. Analysis of milk progesterone showed that UMMB supplementation initiated ovarian cyclicity between Days 14 and 44 (25.50 ± 3.39) postpartum. Behavioural oestrus was within 35–84 days (67.63 ± 5.52). In the control group, ovarian cyclicity began between Days 60 and 125 postpartum and behavioural oestrus within 145–196 days. There was a significant difference ( P < 0.001) between the two groups in the interval of resumption of ovarian cyclicity of cows and for calving to first postpartum oestrus.
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