Immunised and non-challenged group | Non-immunised and challenged group | |
---|---|---|
No. heifers bred | 26 | 22 |
No. heifers conceived | 25 | 22 |
No. stillbirths | 2 | 4 |
No of AI per conception a | 2.5 ± 1 | 2.4 ± 1.2 |
Fertility at first AI (%) a | 61.5 | 68.2 |
Age at 1st AI b | 16.6 ± 2.2 | 17.0 ± 1.6 |
Age at 1st calving b | 27.6 ± 3.0 | 27.7 ± 2.5 |