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 …

This paper reports a new method for synchronizing the time of ovulation in cattle using
GnRH and PGF2α. In Experiments 1 and 2, lactating dairy cows (n= 20) ranging from 36 to …

Previous research indicated that the size of the ovulatory follicle at the time of insemination
significantly influenced pregnancy rates and embryonic/fetal mortality after fixed-timed AI in …

Fertility of the postpartum period is negatively influenced by the incidence of anestrus. The
latter condition is characterized by the absence of estrous behavior, which may be an …

Although fertilization rate usually is very high when male fertility is normal, pregnancy rates
are below expectations when defined by the birth of live offspring in response to first service …

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 …

Our objectives were to identify stages of the estrous cycle at which initiation of a timed
artificial insemination (Ovsynch/TAI) protocol may reduce pregnancy rates and to monitor …

The objectives were to evaluate effects of human chorionic gonadotropin (hCG)(3,300 IU im)
administered on d 5 after AI on CL number, plasma progesterone concentration, conception …

To achieve precise control of the oestrous cycle in cattle it is necessary to control both the
life span of the corpus luteum and the follicle wave status at the end of the treatment. Antral …