References
- 1. Baltar A.E., Oliveira M.A., Catanho M.T.: Bovine cumulus/oocytes complex: quantification of LH/hCG receptors. Mol Reprod Dev 2000, 55, 433-437.
- 2. Burke J.M., de la Sota R.L., Risco C.A., Staples C.R., Schmitt E.J., Thatcher W.W.: Evaluation of timed insemination using a gonadotropin-releasing hormone agonist in lactating dairy cows. J Dairy Sci 1996, 79, 1385-1393.
- 3. De Rensis F., Marconi P., Capelli T., Gatti F., Facciolongo F., Franzini S., Scaramuzzi R.J.: Fertility in post-partum dairy cows in winter or summer following estrus synchronization and fixed time AI after the induction of an LH surge with gonadotropin releasing hormone (GnRH) or human chorionic gonadotropin (hCG). Theriogenology 2002, 58, 1675-1687.
- 4. De Rensis F., Valentini R., Gorrieri F., Bottarelli E., Lopez-Gatius F.: Inducing ovulation with hCG improves the fertility of dairy cows during the warm season. Theriogenology 2008, 69, 1077-1082.
- 5. De Rensis F., Lopez-Gatius F., Garcia-Ispierto I., Techakumpu M.: Clinical use of human chorionic gonadotropin in dairy cows: An update. Theriogenology 2010, 73, 1001-1008.
- 6. Edmonson A.J., Lean I.J., Weaver L.D., Farver T., Webster G.: A body condition scoring chart for Holstein dairy cows. J Dairy Sci 1989, 72, 68-78.
- 7. Fricke P.M., Reynolds L.P., Dale A.R.: Effects of human chorionic gonadotropin administered early in estrous cycle on ovulation and subsequent luteal function in cows. J Anim Sci 1993, 71, 1242-1246.
- 8. Fricke P.M., Caraviello D.Z., Weigel K.A., Welle M.L.: Fertility of dairy cows after resynchronization of ovulation at three intervals following first timed insemination. J Dairy Sci 2003, 86, 3941-3950.
- 9. Geary T.W., Salverson R.R., Whittier J.C.: Synchronization of ovulation using GnRH or hCG with the CO-Synch protocol in suckled beef cows. J Anim Sci 2001, 79, 2536-2541.
- 10. Kinser A.R., Gibson M.F., Vincent D.L., Scheffrahn N.S., Kesler D.J.: Ovarian responses of seasonally anestrous ewes administered progesterone, PMSG, hCG, and (or) GnRH. Theriogenology 1983, 19, 449-460.
- 11. Moreira F., de la Sota R.L., Diaz T., Thatcher W.W.: Effect of day of the estrous cycle at the initiation of a timed artificial insemination protocol on reproductive responses in dairy heifers. J Anim Sci 2000, 78,1568-1576.
- 12. Navanukraw C., Redmer D.A., Reynolds L.P., Kirsch J.D., Grazul-Bilska A.T., Fricke P.M.: A modified presynchronization protocol improves fertility to timed artificial insemination in lactating dairy cows. J Dairy Sci 2004, 87,1551-1557.
- 13. Nogueira M.F., Buratini J.J., Price C.A., Castilho A.C., Pinto M.G., Barros C.M.: Expression of LH receptor Mrna splice variants in bovine granulosa cells: changes with follicle size and regulation by FSH in vitro. Mol Reprod Dev 2007, 74, 680-686.
- 14. Pursley J.R., Mee M.O., Wiltbank M.C.: Synchronization of ovulation in dairy cows using PGF2α and GnRH. Theriogenology 1995, 44, 915-923.
- 15. Pursley J.R., Wiltbank M.C., Stevenson J.S., Ottobre J.S., Garverick H.A., Anderson L.L.: Pregnancy rates per artificial insemination for cows and heifers inseminated at a synchronized ovulation or synchronized estrus. J Dairy Sci 1997, 80, 295-300.
- 16. Pursley J.R., Silcox R.W., Wiltbank M.C.: Effect of time of artificial insemination on pregnancy rates, calving rates, pregnancy loss, and gender ratio after synchronization of ovulation in lactating dairy cows. J Dairy Sci 1998, 81, 2139-2144.
- 17. Robinson R.S., Hammond A.J., Hunter M.G., Mann G.E.: The induction of a delayed post-ovulatory progesterone rise in dairy cows: a novel model. Dom Anim Endocrinol 2005, 28, 285-295.
- 18. Sakase M., Kawate N., Nakagawa C., Fukushima M., Noda M., Takeda K., Ueno S., Inaba T., Kida K., Tamada H., Sawada T.: Inhibitory effects of CIDR-based ovulation-synchronization protocols on uterine PGF2α secretion at the following luteal phase in early postpartum non-cycling beef cows. J Reprod Dev 2006, 52, 497-502.
- 19. Schmitt E.J-P., Diaz T., Drost M., Fredriksson E.W., Thatcher W.W.: Use of a gonadotropin-releasing hormone or human chorionic gonadotropin for timed insemination in cattle. J Anim Sci 1996, 74, 1084-1091.
- 20. Schmitt E.J-P., Diaz T., Barros C.M., de la Sota R.L., Drost M., Fredricksson E.W., Staples C.R., Thorner R., Thatcher W.W.: Differential response of the luteal phase and fertility in cattle following ovulation of the first wave dominant follicle with human chorionic gonadotropin or an agonist of gonadotropin releasing hormone. J Anim Sci 1996, 74, 1074-1083.
- 21. Seguin B.E., Oxender W.D., Britt J.H.: Effect of human chorionic gonadotropin and gonadotropin-releasing hormone on corpus luteum function and estrous cycle duration in dairy heifers. Am J Vet Res 1977, 38, 1153-1156.
- 22. Sirois J., Fortune J.E.: Ovarian follicular dynamics during the estrous cycle in heifers monitored by real-time ultrasonography. Biol Reprod 1988, 39, 308-317.
- 23. Vasconcelos J.L., Silcox R.W., Rosa G.J., Pursley J.R., Wiltbank M.C.: Synchronization rate, size of the ovulatory follicle, and pregnancy rate after synchronization of ovulation beginning on different days of the estrous cycle in lactating dairy cows. Theriogenology 1999, 52, 1067-1078.