A recent study conducted by researchers at
Fertility data collected included age at first breeding, number of services per conception, pregnancy rate and age at first calving.
Researchers found the following in the study:
- Average pregnancy rate to first A.I. was 67 percent.
- Average age at first breeding was 473 days; average age at first calving was 791 days.
- Body weight, girth, IGF-1 and skeletal growth increase were all associated with earlier age at first breeding.
- Increased glucose concentrations at 180 days of age were associated with earlier age at first breeding.
- No association between insulin and urea concentrations and fertility traits was identified.
Researchers concluded suboptimal growth associated with increased age at first calving can be improved through more intense heifer management during rearing.
Access the complete study.