Abstract
FIVE-year fertility records of imported Friesian cattle were analysed. The mean monthly distribution of live and still-born calves as well as calf birth weights showed no significant variations. While the overall mean age at first calving was 28.15 ± 4.57 months, the mean age at first calving of heifers born in February — April, May - July, August – October and November – January were 26.09 ± 3.27, 23.91 ± 1.31, 31.71 ± 4.21 and 28.04 ±3.67 months respectively. Some of these observed variations differed significantly (P < 0.01).
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