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• 1. Busch DC, Atkins JA, Bader JF, Schafer DJ, Patterson DJ, Geary TW, Smith MF. Effect of ovulatory follicle size and expression of estrus on progesterone secretion in beef cows. J Anim Sci 2008; 86: 553–563.
• 2. Wiltbank MC, Sartori R, Herlihy MM, Vasconcelos JLM, Nascimento AB, Souza AH, Ayres H, Cunha AP, Keskin A, Guenther JN. Managing the dominant follicle in lactating dairy cow. Theriogenology 2011; 76: 1568–1582.
• 3. Vasconcelos JLM, Pereira MHC, Meneghetti M, Dias CC, Sá Filho OG, Peres RFG, Rodrigues ADP, Wiltbank MC. Relationships between growth of the preovulatory follicle and gestation success in lactating dairy cows. Anim Reprod 2013; 10: 206–214.
• 4. Lopes AS, Butler ST, Gilbert RO, Butler WR. Relationship of pre-ovulatory follicle size, estradiol concentrations and season to pregnancy outcome in dairy cows. Anim Reprod Sci 2007; 99: 34–43.
• 5. Vasconcelos JLM, Silcox RW, Rosa GJM, Pursley JR, Wiltbank MC. 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.
• 6. Vasconcelos JLM, Sartori R, Oliveira HN, Guenther JG, Wiltbank MC. Reduction in size of the ovulatory follicle reduces subsequent luteal size and pregnancy rate. Theriogenology 2001; 56: 307–314.
• 7. Lamb GC, Stevenson JS, Kesler DJ, Garverick HA, Brown DR, Salfen BE. Inclusion of an intravaginal progesterone insert plus GnRH and prostaglandin F2alpha for ovulation control in postpartum suckled beef cows. J Anim Sci 2001; 79: 2253–2259.
• 8. Tenhagen BA, Witteke M, Drillich M, Heuwiser W. Timing of ovulation and conception rate in primiparous and multiparous cows after synchronization of ovulation with GnRH and PGF2α. Reprod Dom Anim 2003; 38: 451–454.
• 9. Perry GA, Smith MF, Lucy MC, Green JA, Parks TE, MacNeil MD, Roberts AJ, Geary TW. Relationship between follicle size at insemination and pregnancy status. P Natl Acad Sci USA 2005; 102: 5268–5273.
• 10. Perry GA, Smith MF, Roberts AJ, MacNeil MD, Geary TW. Relationship between follicle size of the ovulatory follicle and pregnancy success in beef heifer. J Anim Sci 2007; 85: 684–689.
• 11. Bello NM, Steibel JP, Pursley JR. Optimizing ovulation to first GnRH improved outcomes to each hormonal injection of Ovsynch in lactating dairy cows. J Dairy Sci 2006; 89: 3413–3424.
• 12. Sartori R, Gumen A, Guenther JN, Souza AH, Caraviello DZ, Wiltbank MC. Comparison of artificial insemination versus embryo transfer in lactating dairy cows. Theriogenology 2006; 65: 1311–1321.
• 13. Souza AH, Gumen A, Silva EPB, Cunha AP, Guenther JN, Peto CM, Caraviello DZ, Wiltbank MC. Supplementation with estradiol-17β before the last gonadotropin-releasing hormone injection of the Ovsynch protocol in lactating dairy cows. J Dairy Sci 2007; 90: 4623–4634.
• 14. De Rensis F, Scaramuzzi RJ. Heat stress and seasonal effects on reproduction in the dairy cow—a review. Theriogenology 2003; 60: 1139–1151.
• 15. Hillegass J, Lima FS, Sá Filho MF, Santos JEP. Effect of time of artificial insemination and supplemental estradiol on reproduction of lactating dairy cows. J Dairy Sci 2008; 91: 4226–4237.
• 16. Stevenson JL, Dalton JC, Santos JEP, Sartori R, Ahmadzadeh A, Chebel RC. Effect of synchronization protocols on follicular development and estradiol and progesterone concentrations of dairy heifers. J Dairy Sci 2008; 9: 3045–3056.
• 17. Brusveen DJ, Souza AH, Wiltbank MC. Effects of additional prostaglandin F2α and estradiol-17β during Ovsynch in lactating dairy cows. J Dairy Sci 2009; 92: 1412–1422.
• 18. Colazo MG, Gordon MB, Rajamahendran R, Mapletoft RJ, Ambrose DJ. Pregnancy rates to timed artificial insemination in dairy cows treated with gonadotrophin-releasing hormone or porcine luteinizing hormone. Theriogenology 2009; 72: 262–270.
• 19. Keskin A, Yilmazbas-Mecitoglu G, Gumen A, Karakaya E, Darici R, Okut H. Effect of hCG vs. GnRH at the beginning of the Ovsynch on first ovulation rate and conception rate in cyclic lactating dairy cows. Theriogenology 2010; 74: 602–607.
• 20. Sá Filho MF, Crespilho AM, Santos JEP, Perry GA, Baruselli PS. Ovarian follicle diameter at timed insemination and estrous response influence likelihood of ovulation and pregnancy after estrous synchronization with progesterone or progestin-based protocols in suckled Bos indicus cows. Anim Reprod Sci 2010; 120: 23–30.
• 21. Miller BG, Moore NW. Effects of progesterone and oestradiol on endometrial metabolism and embryo survival in the ovariectomized ewe. Theriogenology 1976; 6: 636.
• 22. Hawk HW. Sperm survival and transport in the female reproductive tract. J Dairy Sci 1983; 66: 2645–2660.
• 23. Mihm M, Diskin MG, Roche JF. Regulation of follicle wave growth in cattle. Reprod Dom Anim 1996; 31: 531–538.
• 24. Revah I, Butler WR. Prolonged dominance of follicles and reduced viability of bovine oocytes. J Reprod Fertil 1996; 106: 39–47.
• 25. Lynch CO, Kenny DA, Childs S, Diskin MG. The relationship between ovulatory endocrine and follicular activity on corpus luteum size, function, and subsequent embryo survival. Theriogenology 2010; 73: 90–198.
• 26. National Research Council. Nutrient Requirements of Dairy Cattle. 7th Revised Edition. Washington, DC, USA: National Academy of Sciences; 2001.
• 27. Ferguson JD, Galligan DT, Thomsen N. Principal descriptors of body condition score in Holstein cows. J Dairy Sci 1994; 77: 2695–2703.
• 28. Sartori R, Fricke MP, Ferreira JCP, Ginther OJ, Wiltbank MC. Follicular deviation and acquisition of ovulatory capacity in bovine follicles. Biol Reprod 2001; 65: 1403–1409.
• 29. Galvao KN, Santos JEP. Factors affecting synchronization and conception rate after the Ovsynch protocol in lactating dairy cows. Reprod Dom Anim 2010; 45: 439–446.
• 30. Wiltbank M, Lopez H, Sartori R, Sangsritavong S, Gumen A. Changes in reproductive physiology of lactating dairy cows due to elevated steroid metabolism. Theriogenology 2006; 65: 17–29.