SYNCHRONIZATION OF OESTRUS AND FERTILITY FOLLOWING ARTIFICIAL INSEMINATION IN HEIFERS GIVEN PROSTAGLANDIN F2

The Synchronization of Oestrus in Sheep in Artificial Insemination Programmes

Fertility in Merino Ewes in Artificial Insemination Programmes following Synchronization of Ovulation Using Cloprostenol, a Prostaglandin Analogue

Ten field and laboratory experiments were conducted in which Merino ewes were treated with one or two 125pg injections of Cloprostenol, an analogue of prostaglandin F2a (PG). All treatments commenced in the luteal phase of the oestrous cycle. Sixty-six percent of ewes were detected in behavioural oestrus within 64 hr of completion of treatments although 95% of all treated ewes ovulated in appar...

Synchronization of estrus and artificial insemination in replacement beef heifers using gonadotropin-releasing hormone, prostaglandin F2alpha, and progesterone.

We evaluated whether a fixed-time AI (TAI) protocol could yield pregnancy rates similar to a protocol requiring detection of estrus, or detection of estrus and AI plus a clean-up TAI for heifers not detected in estrus, and whether adding an injection of GnRH at controlled internal drug release (CIDR) insertion would enhance fertility in CIDR-based protocols. Estrus in 2,075 replacement beef hei...

Oestrus, LH, ovulation and fertility in beef heifers.

The pregnancy rate resulting from matings at a single oestrus in beef cattle averages 70% for natural mating (Turman, Laster, Renbarger & Stephens, 1971) and 60% for artificial insemination (Laster, Glimp & Gregory, 1972). The sources and causes of low pregnancy rates have not been defined, but might include variation in time of ovulation relative to deposition of spermatozoa in the female repr...

Ovarian response and conception rate following oestrus synchronization using three protocols in Egyptian buffalo heifers.

OBJECTIVE The aim of this study was to monitor the ovarian response and conception rate following estrous synchronization using CIDR, Ovsynch and double prostaglandin F2α protocols in Egyptian buffalo heifers. MATERIAL AND METHODS A total of 80 cyclic buffalo heifers were divided into four equal groups: CIDR (intravaginal progesterone releasing device, EAZI-BREEDTM CIDR®), Ovsynch (GnRH, PGF2...