Presynchronization with Gonadotropin-Releasing Hormone Does Not Improve Fertility in Holstein Heifers
نویسندگان
چکیده
منابع مشابه
Effect of presynchronization with human chorionic gonadotropin or gonadotropin-releasing hormone 7 days before resynchronization of ovulation on fertility in lactating dairy cows.
Our objectives were to (1) compare the effect on pregnancies per artificial insemination (P/AI) of presynchronization of the estrous cycle with human chorionic gonadotropin (hCG) 7d before resynchronization of ovulation (Resynch) initiated 25 d after timed artificial insemination (TAI) and compare the presynchronization treatment with the Double-Ovsynch (DO) protocol, and (2) evaluate whether h...
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We determined the effects of hCG on ovarian response, concentration of progesterone, and fertility in a fixed-time AI (TAI) protocol. Four hundred forty-four crossbred beef heifers were synchronized with the CO-Synch + CIDR (controlled internal drug-releasing insert) protocol. In addition, heifers were randomly assigned to 1 of 4 treatments in a 2 × 2 factorial arrangement of treatments with ma...
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Gonadotropin releasing hormone (GnRH) affects ovarian and testicular steroidogenesis, is produced by the placenta, and increases chorionic gonadotropin (hCG) production in preterm placenta. It was hypothesized that GnRH might also regulate placental synthesis of progesterone (P) and estradiol (E2) and the effects were studied of GnRH and the [D-Trp6]-LH-RH analog on the production of P, E2, and...
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PURPOSE Gonadotropin-releasing hormone (GnRH) agonists have been used with adjuvant chemotherapy to protect ovarian function. However, there are no data on the actual pregnancy rates among young breast cancer patients receiving GnRH agonists and concurrent chemotherapy in Korea. METHODS Among patients who underwent surgery from January 2002 to April 2012, premenopausal patients aged between 2...
متن کاملInduction of estrus in ovariectomized cows and heifers: effects of estradiol benzoate and gonadotropin releasing hormone.
Three experiments were conducted with ovariectomized (OVX) cows and heifers to investigate potential neuroendocrine mechanisms controlling estrous behavior. In Exp. 1, 10 OVX cows were treated with either 125 micrograms estradiol benzoate and 10 cc saline (125 micrograms EB + SAL), 125 micrograms EB and 500 micrograms gonadotropin releasing hormone (125 micrograms EB + GnRH), 250 micrograms EB ...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2006
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(06)72422-5