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 …

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) …

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

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 …

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 …

The objective of this study was to compare the reproductive performance of lactating dairy
cows using a treatment (TRT) program for second and subsequent artificial insemination (AI) …

The objective was to determine the effect of exogenous progesterone (P 4) in a timed
artificial insemination (TAI) protocol initiated at 2 different times post-AI on pregnancies per …

The objective was to compare fertility in cows using an Ovsynch protocol starting on day 6 of
first postpartum estrous cycle with an Ovsynch protocol initiated at random stages of the …

Our objective was to evaluate time to pregnancy after the first service postpartum and
pregnancy per artificial insemination (P/AI) in dairy cows managed with 2 resynchronization …