agent promotes corpora lutea regression and subsequently induces parturition.
The injection of gonadorelin causes not only luteotrophic support but also prevents the luteolytic
mechanism by decreasing of plasma estradiol 17[beta] concentration and hence prohibits the rapid decreased of progesterone (Alaam et al.
Estrogen secreted by the elongating conceptus acts as a maternal recognition signal by changing the direction of luteolytic
A potential approach to reduce progesterone concentrations during follicular development in a CIDR based estrous synchronization protocol is by administering a luteolytic
dose of [PGF.
effects of prostaglandin F2alpha on day 8 to 19 corpora lutea in the bitch.
Effects of luteolytic
dose of oestradiol benzoate on uterine oxytocin receptor concentrations, phosphoinositide turnover and prostaglandin F-2a secretion in sheep.
effects of right and left uterine horns in the alpaca.
In reproduction, PRL can have a luteotropic or luteolytic
action, depending on the stage of the reproductive cycle.
All ewes received two luteolytic
doses of cloprostenol (125 [micro]g intramusculary; Mallinckrodt, Sao Paulo, Brazil) at 7 day intervals during the breeding season.
The lack of CL maintenance along with the estradiol valerate that is luteolytic
induces CL regression.
This is thought to be mediated by the inability of the embryo to suppress the luteolytic
mechanism during the period of CL maintenance, further compromising the implantation of the embryo (18).
This study was carried out to evaluate the effect of insemination number (timed artificial insemination: TAI, 2 versus 1) on pregnancy rate in beefheifers treated with two injections of a luteolytic
agent (PGF, tiaprost), 12 days between each administration, and to evaluate whether if GnRH administration at one TAI produces similar pregnancy rate compared to two TAI.