Superovulation Using CIDR in Holstein Cows.

Abstract

Three trials were conducted to investigate the superovulatory response of Control Internal Drug Releasing device (CIDR(R)). Forty-six Holstein cows were divided into three treatment groups per trial; CIDR(R) without progesterone (P4) (Control), CIDR(R) containing 1.9 g P4 for 12 days (CIDR(R)-1) and the two CIDRs(R) with P4 replacing with a new CIDR(R) on day 9 of the 12 day insertion period (CIDR(R)-2). Follicle stimulating hormone (FSH) were administered on day 9 up to the time of CIDR(R) removal and additional prostaglandin F2ƒ¿ injections were done on day 11 of the 12 day insertion period. Ovulation rate, recovered and transferable embryos, and P, and estradiol-17ƒÀ (E2) levels in blood plasma were evaluated and compared among the treatment groups. There were no statistical differences on the mean

Efficacy of a Cue-Mate Intravaginal Insert and Injection of Prostaglandin F2α for Synchronizing Estrus in Hanwoo Cattle

“…Short-term treatment with intravaginal progesterone (P4)-releasing inserts (CIDR-B, InterAg, Hamilton, New Zealand) produced tight synchrony of estrus, but fertility was variable and related to duration of insert treatment (Iwazumi et al, 1994;Xu and Burton, 2000). The select synch protocol (injection of GnRH 7 d before an injection of PGF 2α ) produced estrus detection, conception, and pregnancy rates in beef heifers similar to those achieved after feeding melengestrol acetate for 14 days followed in 17 to 19 days of PGF 2α or two injections of PGF 2α (Stevenson et al, 1997).…”