Four experiments were conducted to evaluate hormonal strategies to induce ovulation in Nellore heifers. In experiment 1, heifers (N = 1039) received a controlled internal drug release (CIDR) of fourth use (CIDR-4) on Day -12 or no CIDR (CIDR-0). The
Three experiments evaluated effects of estradiol (E(2)) and/or progesterone (P(4)) prior to induction of ovulation with GnRH on subsequent luteal lifespan in anestrous Nelore cows. In Experiment 1, cows (25-65 days post-partum [DPP]; n=114) were assigned randomly to receive a
Human reproduction (Oxford, England), 24(11), 2688-2692 (2009-07-30)
The aromatase inhibitor, letrozole, exerts embryo toxic effects in rats, causing increased embryo lethality and anomalies of the axial skeleton at pharmacologically relevant doses. Letrozole acts by inhibiting estrogen biosynthesis. It may thus be feasible that estrogen deprivation is a
Journal of dairy science, 92(8), 3815-3818 (2009-07-22)
The objective was to determine the effect of supplemental estrogen (estradiol cypionate, ECP) at dry-off on temporal changes in concentrations of lactose in blood plasma of Holstein cows as an indicator of rate of mammary involution. Thirty-two Holstein cows (8/group)
Length of dominance of the ovulatory follicle and exposure to oestradiol (OE(2)) during proestrus can affect fertility. Lactating cows had their oestrous cycle pre-synchronized and were subjected to one of the four synchronization treatments. Cows in the oestrus detection (OD)
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