The discovery of progesterone (P4) and elucidation of the mechanisms of P4 action have an
important place in the history of endocrinology and reproduction. Circulating P4 …

Simple Summary Reproductive efficiency is critical for profitability of dairy operations. The
first part of this manuscript discusses the key physiology of dairy cows and how to practically …

Our objective is to overview the research that lead to the development of fertility programs for
high-producing lactating dairy cows using only GnRH and Prostaglandin F 2α (PGF 2α) …

Although coupling a nonpregnancy diagnosis with a management strategy to quickly
reinitiate artificial insemination (AI) may improve reproductive efficiency by decreasing the …

A systematic review of the literature was performed with the objective to evaluate the effects
of progesterone supplementation using a single intravaginal insert during timed artificial …

Abstract Lactating Holstein cows (n= 897) were randomly assigned to a 2× 2 factorial
arrangement of treatments to compare the main effects of presynchronization with GnRH 6 d …

Ovulation to the first GnRH (G1) treatment of the Ovsynch protocol improves synchronization
rate and pregnancies per AI (P/AI). Elevated progesterone (P4) concentrations at G1 …

An experiment was conducted with the objective to determine the effects of estradiol,
progesterone, presence of a corpus luteum (CL), and size of a dominant follicle on the …

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 …

Our objective was to evaluate the effect of a second PGF 2α treatment and duration of an
Ovsynch protocol that included a progesterone-releasing intravaginal device (PRID) on …