Timed-AI after synchronization of ovulation has become one of the most used reproductive
technologies developed during the past 40 years. Various adaptations of this technology are …

Heat stress has consequences on both the physiology and reproductive performance of
cows, but the most dramatic effect for dairy producers is the decrease produced in fertility …

Abstract Treatment with GnRH and PGF2α is a practical method for controlling ovarian
follicular and luteal functions and increasing the precision of estrus synchronization in cyclic …

The most common beef cattle raised in Brazil is the Nelore breed (Bos indicus). Information
obtained by ultrasonography on follicular growth in Bos taurus cattle has been accumulating …

An experiment compared the effectiveness of a timed AI and an AI at observed estrus.
Lactating dairy cows were injected with PGF2α, at 30±a range of 3 d postpartum, with a …

Estrous behavior and the estrus-to-ovulation interval are essential for estimating the best
time to artificially inseminate cattle. Because these parameters are not well characterized in …

Three experiments were conducted to evaluate a synchronization protocol with AI at a
predetermined time. In Exp. 1, 169 dairy heifers were assigned randomly to two groups: 1) …

Observing cows in estrus and inseminating them at the optimum time are necessary steps
for effective reproductive management of a dairy herd. However, larger herd sizes can lead …

This study evaluated ovarian and estrous responses as affected by day of the estrous cycle
at initiation of treatment among cows synchronized with the Select Synch protocol. Fifty-six …

We wished to compare the effect of summer heat stress on pregnancy rate in cows that were
inseminated at a set interval associated with a synchronized ovulation vs those inseminated …