expression of estrus at this time. In our study, the improved
performance after 50 DIM is due to the fact that all first
ovulations postpartum occurred before 50 days. In practice,
it is not advisable to inseminate before 50 DIM so as to
ensure the resumption of cyclicity in all cows and complete
involution of the uterus [34]. Thus, the first insemination is
done generally after 65 DIM [25,35,36] at a time when
there are no longer any performance issues