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 …

The establishment and maintenance of pregnancy in lactating dairy cows is a complex
biological event that is influenced by a multitude of factors, from the reproductive biology of …

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) …

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 …

The objective of this study was to compare circulating progesterone (P4) profiles and
pregnancies per AI (P/AI) in lactating dairy cows bred by timed artificial insemination (TAI) …

The objective was to determine if using a Double-Ovsynch protocol [DO; Pre-Resynch:
GnRH–7 d–PGF2α–3 d–GnRH, 7 d later Breeding-Resynch: GnRH–7 d–PGF2α–56 h …

Reproductive efficiency is not optimal in high-producing dairy cows. Although many aspects
of ovarian follicular growth in cows are similar to those observed in heifers, there are …

The main objective of the implementation of artificial insemination (AI) in cattle is to produce
a sustained genetic progress in the herd. Although AI is an old reproductive biotechnology …

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 …