The dairy industry in the United States has changed dramatically in the last decade. Milk
production per cow has increased steadily because of a combination of improved …

Good detection of estrus is critically important in dairy husbandry. Incorrect detection of
estrus is related to loss of profit due to extended calving intervals, milk loss, veterinary costs …

Recently a protocol was developed that precisely synchronizes the time of ovulation in
lactating dairy cows (Ovsynch; GnRH-7d-PGF2α-2d-GnRH). We evaluated whether initiation …

Administration of gonadotropin-releasing hormone (GnRH) induces a surge of luteinizing
hormone and ovulation in a variety of species, including human beings. Our objectives were …

Ovarian function was compared between nulliparous heifers (n= 29; 10 to 16 mo old) and
lactating Holstein cows (n= 31; 55.9±3.5 d postpartum). Follicular dynamics, corpus luteum …

The objectives of these experiments were as follows:(1) to determine the association
between circulating concentrations of pregnancy-associated glycoproteins (PAG) and late …

The objective of this experiment was to determine the effects of controlled heat stress on
ovarian function of lactating dairy cows. Estrus was synchronized (estrus= d 0), and cows …

Four experiment stations (IL, KS, MN, and MO) conducted experiments to determine effects
of introducing a CIDR (controlled internal device release) into an ovulation control program …

Somatotropin (ST), insulin-like growth factor (IGF)-I, and IGF-II affect animal growth and
lactation as well as animal reproduction. Understanding the effects of ST and the IGF on …

Our objective was to determine whether progesterone (P4) supplementation during an
Ovsynch protocol would enhance fertility in lactating dairy cows. Lactating dairy cows (n …