Application of prostaglandin F2 alpha only at 4-5 weeks after parturition has got mixed results in treatment of sub-clinical endometritis but combining it with ovulation synchronisation protocol may prove more effective and can help in reducing the days open in cows.
The time taken to resume ovarian activity varies in dairy and beef breeds, and also with the body condition that an animal bears. The usual range for the first ovulation to take place is around 15-30 days. However, in our region, the weather and nutritional stress oftentimes mean that this period is prolonged.
To answer your question, there is no ovulation, there is no corpus luteum and there is no response to PG F2 alpha as we expect with the presence of CL However, it will cause some uterine contraction nonetheless.
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