The study was conducted on records of animal movements of the Centre from 1998 to 2008. The maximum of the calving took place in March and April (33% of total births). The majority of services (48.6%) occured in the period during which pastures were at their best level. Age at the first calving was 1606 ± 263 days (53.5 ± 8.8 months). More of the heifers (77.03%) calved for the first time after the age of 4 years. There was no significant relationship between age at first calving and month of birth of the female. Calving interval was 603 ± 227 days (20.1 ± 7.5 months). The intervals were significantly affected by the rank of lactation. The mortality rate of calves under 12 months was 26.7%. Most of the mortalities occurred before the age of 3 months (65% of total calf mortality), a majority (34%) in the three weeks following birth. Calves born during the rainy season had a death rate (28.4%) higher than that of calves born during the dry season (23.30%). It would appear that, in order to minimize these mortalities, a breeding season should be established order to regroup the births at the most favorable period.
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