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 …

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 …

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 …

Greater blood concentrations of nonesterified fatty acids (NEFA) and lesser blood
concentrations of glucose are indicative of the normal process of nutrient partitioning that …

Two experiments evaluated the influence of follicular wave at artificial insemination (AI) on
fertility of dairy cows. In experiment 1, data from 5,607 lactating cows enrolled in estrous and …

This manuscript reviews the effect of progesterone (P4) during timed AI protocols in lactating
dairy cows. Circulating P4 is determined by a balance between P4 production, primarily by …

Ovsynch-type synchronization of ovulation protocols have suboptimal synchronization rates
due to reduced ovulation to the first GnRH treatment and inadequate luteolysis to the …

Ovulation to the first GnRH injection of Ovsynch-type protocols is lower in cows with high
progesterone (P4) concentrations compared with cows with low P4 concentrations …

Abstract Lactating dairy cows (n= 1,025) on a commercial dairy farm were randomly
assigned at 10±3 d in milk (DIM) to 1 of 3 treatments for submitting cows to first artificial …

Despite the widespread adoption of hormonal synchronization protocols that allow for timed
artificial insemination (AI), detection of estrus plays an important role in the reproductive …