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Ola Syrstad 《Livestock Production Science》1985,12(4):299-307
Data extracted from reports on Bos taurus × Bos indicus crossbreeding were used to estimate the amount of heterosis in these crosses. Traits studied were age at first calving, milk yield, lactation length, and calving interval. The estimates obtained were (percent of midparent means in parentheses):
Age at first calving | ?3.2 to ?4.4 months | (?8 to ?12%) |
Milk yield | 287 to 400 kg | (18 to 25%) |
Lactation length | 7 to 15 days | (2 to 5%) |
Calving interval | ?30 to ?31 days | (?7%) |