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Non-genetic factors affecting the reproductive efficiency in a dairy herd with seasonal calving in southern Chile (10th Region). 3. Cows. Effects of age and degree of calving difficulty



Non-genetic factors affecting the reproductive efficiency in a dairy herd with seasonal calving in southern Chile (10th Region). 3. Cows. Effects of age and degree of calving difficulty



Avances en Produccion Animal 22(1/2): 63-70



Data on 1147 records of 402 dairy cows in Chile were analysed. For heifers aged 2 and 3 years at first calving, the CR to first service was 78.8 and 72.6% respectively vs. 60.1% for cows in their second or later parity (P<0.001), but parity had no significant effect on the interval from calving to the first subsequent service (76.7, 79.2 and 75.9 days).

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