This experiment was conducted to determine the effect of altering preovulatory estradiol
concentrations, through manipulation of length of proestrus, on peripheral progesterone …

The role of preovulatory estradiol on post-fertilization embryo survival and pregnancy
establishment has not been well characterized in beef cows. We hypothesized that …

In beef cattle, the ability to conceive has been associated positively with size of the
preovulatory follicle (POF). Proestrus estradiol and subsequent progesterone concentrations …

Previous research from our laboratory in beef cattle suggests that ovarian follicle maturity
and subsequent fertility is influenced by length of proestrus across a range of follicle sizes …

The ability to induce ovulation with an injection of GnRH facilitated the development of fixed-
time artificial insemination (AI) protocols. However, animals that exhibit estrus prior to fixed …

Animals that exhibited estrus had greater pregnancy success compared to animals that did
not exhibit estrus before fixed-time AI (FTAI). Estradiol is synthesized in bovine ovarian …

Three experiments evaluated the effects of expression of estrus and gonadotropin releasing
hormone (GnRH) treatment on pregnancies per AI (P/AI) in beef cattle that were treated with …

Two experiments were performed to test the hypothesis that elevated progesterone
concentrations impair pregnancy rate to timed artificial insemination (TAI) in postpuberal …

Long-acting injectable progesterone (iP4) supplementation during early diestrus is a
strategy to increase conception rates in cow-calf beef operations. However, iP4 treatment …

Two experiments were conducted to investigate the role of relatively lesser and greater
progesterone (P4) concentrations during early follicular development on ovulatory follicle …