The researchers tracked:
- Periparturient disease incidence.
- Calving score.
- Body condition.
- Negative energy balance.
- Uterine inflammation during the peripartum period.
- Milk production level.
Cows that ovulated by 21 days in milk were associated with a shorter time to pregnancy. Conversely, and not surprisingly, prolonged anovulation was detrimental to subsequent reproductive performance and increased likelihood of culling.
The researchers cautioned that the effects of prolonged anovulation on reproduction were worse in cows of third parity or greater, recommending that producers apply targeted mitigation strategies to those groups of cows.