Early estrus-synchronization protocols focused on regressing the corpus luteum (CL) with an
injection of PGF2α followed by detection of estrus or involved the use of exogenous …

Prolonged postpartum acyclicity in suckled beef cows reduces the calf crop, and causes
economic loss to beef cattle producers. Once anterior pituitary LH stores have been …

Two experiments were conducted to investigate the effects of equine chorionic gonadotropin
(eCG) at progestin removal and gonadotropin-releasing hormone (GnRH) at timed artificial …

Three experiments were conducted to induce estrus and (or) ovulation in 1,590 suckled beef
cows at the beginning of a spring breeding season. In Exp. 1, 890 cows at three locations …

This paper reviews seasonal breeding, puberty, postpartum anestrus, embryonic loss and
calf survival and their constraints in female yaks. Methods for improving fertility in postpartum …

Abstract Cycling (n= 16) and noncycling (n= 24), early postpartum, suckled beef cows of
three breeds were assigned randomly to three treatments: 1) 100-μ g injection of GnRH plus …

Abstract In Exp. 1, 187 lactating beef cows were treated with injections of GnRH 7 d before
and 48 h after prostaglandin F2α (PGF2α; Cosynch) or with Cosynch plus a 7-d treatment …

Conception during the first week of the breeding season is limited by the proportion of cows
that have resumed normal estrous cycles (cycling) before the beginning of the breeding …

Résumé En France, trois types de traitements hormonaux permettent de synchroniser les
chaleurs chez les bovins. Les traitements à base de prostaglandine F 2 α ou de ses …

The effect of GnRH pretreatment on estrus detection rate, precision of estrus, and
reproductive performance of postpartum beef cows synchronized to estrus using GnRH and …