Fixed-time artificial insemination (FTAI) has been regarded as the most useful method to
increase the number of cows inseminated in a given herd. The main treatments for FTAI in …

This is a review of the physiology and endocrinology of the estrous cycle and how ovarian
physiology can be manipulated and controlled for timed artificial insemination (TAI) in beef …

The main objective of the implementation of artificial insemination (AI) in cattle is to produce
a sustained genetic progress in the herd. Although AI is an old reproductive biotechnology …

Basic knowledge of mechanisms controlling reproductive processes in mammals was
limited in the early 20th century. Discoveries of physiologic processes and mechanisms …

Objectives were to determine the effects of GnRH at the initiation of the 5-d timed artificial
insemination (AI) program combined with 2 injections of PGF 2α on ovarian responses and …

The objectives were to evaluate pregnancy per AI (P/AI) of dairy cows subjected to the 5-day
timed AI protocol under various synchronization and luteolytic treatments. Cows were either …

This study aimed to determine the effect of circulating progesterone (P4) concentrations
produced by a corpus luteum (CL) or released by an intravaginal P4 implant (IPI) on GnRH …

The early corpus luteum (CL)(before Day 6) does not regress after a single PGF 2α
treatment. We hypothesized that increasing PGF 2α dose or number of treatments would …

The objectives were to compare the effects of 2 methods of presynchronization and 2
lengths of proestrus on fertility of grazing dairy cows subjected to a 5-d timed artificial …

Reproduction is critical for the success of both dairy and beef cattle production. Inadequate
reproduction impairs profitability by compromising production, delaying genetic progress …