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

Two experiments were conducted to evaluate an accelerometer system (Heatime; SCR
Engineers Ltd., Netanya, Israel) to manage reproduction in lactating dairy cows. In …

Gonadotropin-releasing hormone (GnRH) and its analogues cause an acute secretion of
luteinizing hormone (LH) and follicle stimulating hormone (FSH) such that concentrations in …

In Experiment 1, 308 Holstein cows were assigned randomly to four treatments: 1) GnRH
injection followed in 7 d by PGF2α injection, then another GnRH injection 33h later, and …

Detection of misuse of peptides and proteins as growth promoters is a major issue for sport
and food regulatory agencies. The limitations of current analytical detection strategies for …

Three experiments were conducted to evaluate a synchronization protocol with AI at a
predetermined time. In Exp. 1, 169 dairy heifers were assigned randomly to two groups: 1) …

Two experiments examined effects of GnRH administered within 3h after onset of estrus
(OE) on ovulation and conception in dairy cows. In experiment 1, 46 cows received either …

Pregnancy-specific protein B (PSPB) and progesterone concentrations were determined by
RIAs in venous plasma during early pregnancy after 177 artificial inseminations (AI) …

Metabolic and ovarian responses of lactating and nonlactating cows to recombinant bST
(sometribove) were measured. Eighteen lactating cows (60 to 100 d postpartum) and 6 …

To determine whether injection of hCG or GnRH-agonist on d 5 after estrus (d 0) has a
differential functional effect on an induced and the original corpus luteum (CL), two …