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 …

We hypothesized that reducing the size of the ovulatory follicle using aspiration and GnRH
would reduce the size of the resulting CL, reduce circulating progesterone concentrations …

Two experiments compared follicular and luteal development and circulating steroid
concentrations from induced luteolysis to ovulation in lactating Holstein cows (n= 27; …

When doses of progestin used commercially are administered to synchronize the stage of
the estrous cycle among bovine females, fertility is reduced compared with that of untreated …

This study tested the hypothesis that high feed consumption will acutely decrease circulating
progesterone concentrations. In the first experiment, a Latin Square design was used to test …

In cattle, prolonged progestogen treatments following luteolysis result in persistent dominant
follicles (DF) that are associated with precise onset of estrus but marked reductions in …

Ovarian follicle development continues in a wave-like manner during the bovine oestrous
cycle giving rise to variation in the duration of ovulatory follicle development. The objectives …

Prolonged postpartum acyclicity in suckled beef cows reduces the calf crop, and causes
economic loss to beef cattle producers. Once anterior pituitary LH stores have been …

Ovarian follicular waves were characterized before and after breeding in 52 lactating beef
cows and 16 heifers. Effects of two (2 W) or three (3 W) waves of follicular development and …