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 …

Lactating dairy cows are classified as spontaneous ovulators, in which establishment of
pregnancy depends on the accuracy of detection of behavioral estrus for correct timing of …

This review integrates established and new information on the role of progesterone,
interferon tau (IFNT), and prostaglandins in uterine biology of ruminants. Establishment of …

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

The causes of low fertility in dairy cattle are complex and multifactorial and may be due to
compromised follicle development affecting oocyte quality, a suboptimal reproductive tract …

Resumption of ovulation after parturition is a coordinated process that involves recoupling of
the GH/insulin-like growth factor 1 axis in the liver, increase in follicular development and …

The ovulation of a mature oocyte at metaphase II of meiosis, with optimal potential to
undergo fertilisation by a sperm cell, complete meiosis and sustain the switch to mitotic …

The objectives were to determine the effect of progesterone supplementation on fertility
responses in lactating dairy cows without corpora lutea (CL) at initiation of the 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 …

The objective of this experiment was to determine the effect of high versus low progesterone
(P4) during the pre-dominance or dominance phase (or both) of ovulatory follicle …