The fresh new time regarding putting on weight provides minimal results for heifer fertility, however the weight an effective heifer are at by start of the her earliest reproduction seasons heavily has an effect on the girl reproductive triumph. Patterson while others exhibited greater maternity costs when heifers attained 65% in place of 55% of the adult body weight of the start of the reproduction 12 months . Since then, reduced rates regarding adolescence, however, zero difference in breeding season maternity pricing was basically claimed inside heifers managed to arrived at 55–56% in the place of 58–60% of its adult weight [13, sixteen, 17]. Pregnancy rate so you’re able to fake insemination had a tendency to getting low in heifers made to 55% , but wasn’t lower in heifers created to 56% out-of adult fat . The development of heifers so you can 50% versus 55% from adult weight in addition to produced zero difference in full forty five-d breeding seasons pregnancy rates, however, somewhat put off new day from first calving .
An enormous body of information bolster the theory you to heifers will be become developed to come to at least percentage of its forecast adult body weight because of the start of breeding 12 months.