Follicular dynamics and steroid profiles in cows during and after treatment with progestin-based protocols for synchronization of estrus

Journal of Animal Science

Volumn 82, Issue 4, 2004, Pages 1022-1028

  Stegner, J E ^a   Kojima, F N ^a   Bader, J F ^a   Lucy, M C ^a   Ellersieck, M R ^a   Smith, M F ^a   Patterson, D J ^a  

^a UNIVERSITY OF MISSOURI   (United States)

Author keywords

Beef Cow; GnRH; Progestin; Steroids; Synchronization of Estrus

Indexed keywords

EID: 2342538398     PISSN: 00218812     EISSN: None     Source Type: Journal    
DOI: 10.1093/ansci/82.4.1022     Document Type: Article

References (23)

1. Cupp, A. S., T. T. Stumpf, F. N. Kojima, L. A. Werth, M. W. Wolfe, M. S. Roberson, R. J. Kittok, and J. E. Kinder. 1995. Secretion of gonadotrophins change during the luteal phase of the bovine oestrous cycle in the absence of corresponding changes in progesterone or 17β-oestradiol. Anim. Reprod. Sci. 37:109-119.
2. Geary, T. W., J. C. Whittier, D. M. Hallford, and M. D. MacNeil. 2001. Calf removal improves conception rates to the Ovsynch and CO-Synch protocols. J. Anim. Sci. 79:1-4.
3. Kirby, C. J., M. F. Smith, D. H. Keisler, and M. C. Lucy. 1997. Follicular function in lactating dairy cows treated with sustained-release bovine somatotrophin. J. Dairy Sci. 80:273-285.
4. Kojima, F. N., B. E. Salfen, W. A. Ricke, M. C. Lucy, M. F. Smith, and D. J. Patterson. 2000. Development of an estrus synchronization protocol for beef cattle with short-term feeding of melengestrol acetate: 7-11 Synch. J. Anim. Sci. 78:2186-2191.
5. Kojima, F. N., J. E. Stegner, B. E. Salfen, R. L. Eakins, M. F. Smith, and D. J. Patterson. 2002. A fixed-time AI program for beef cows with 7-11 Synch. Proc. West. Sec. Am. Soc. Anim. Sci. 53:411-413.
6. Kojima, F. N., J. E. Stegner, J. F. Bader, D. J. Schafer, R. L. Eakins, M. F. Smith, and D. J. Patterson. 2003a. A fixed-time AI program with 7-11 Synch. Proc. West. Sec. Am. Soc. Anim. Sci. 54:265-267.
7. Kojima, F. N., J. F. Bader, J. E. Stegner, M. F. Smith, and D. J. Patterson. 2003b. A comparison of two fixed-time AI programs for postpartum beef cows. J. Anim. Sci. 81(Suppl. 1):50.
8. Mussard, M. L., C. R. Burke, C. L. Gasser, E. J. Behlke, K. A. Colliflower, D. E. Grum, and M. L. Day. 2003. Ovulatory response, luteal function and fertility in cattle induced to ovulate dominant follicles of early or late maturity. Biol. Reprod. 68(Suppl. 1):332.
9. NAHMS. 1994. National Animal Health Monitoring Service, USDA, APHIS. Sparse use of reproductive management technology for beef heifers and cows. USDA-APHIS Center for Epidemiology and Animal Health, Fort Collins, CO.
10. NAHMS. 1998. Part IV. National Animal Health Monitoring Service, USDA, APHIS. Changes in U.S. beef cow-calf producers. USDA-APHIS Center for Epidemiology and Animal Health, Fort Collins, CO.
11. 2α (PG) estrus synchronization protocol in postpartum beef cows. J. Anim. Sci. 79(Suppl. 1):250.
12. Patterson, D. J., J. E. Stegner, F. N. Kojima, and M. F. Smith. 2002. MGA® Select improves estrus response in postpartum beef cows in situations accompanied with high rates of anestrus. Proc. West. Sec. Am. Soc. Anim. Sci. 53:418-420.
13. Patterson, D. J., F. N. Kojima, and M. F. Smith. 2003. A review of methods to synchronize estrus in replacement beef heifers and postpartum cows. J. Anim. Sci. 81(E. Suppl. 2):E166-E177. Online. Available: http://www.asas.org/ symposia/03esupp2/ jas2402.pdf. Accessed June 19, 2003.
14. Perry, G. A., T. W. Geary, M. C. Lucy, and M. F. Smith. 2002a. Effect of follicle size at time of GnRH-induced ovulation on luteal function and fertility. Proc.West. Sec. Am. Soc. Anim. Sci. 53:45-48.
15. Perry, G. A., M. F. Smith, and D. J. Patterson. 2002b. Evaluation of a fixed-time artificial insemination protocol for postpartum beef cows. J. Anim. Sci. 80:3060-3064.
16. Perry, G. A. 2003. Induction of cycling status and effect of follicle size on fertility in postpartum beef cows. Ph.D. Diss. Univ. Missouri-Columbia.
17. Rahe, C. H., R. E. Owens, J. L. Fleiger, H. J. Newton, and P. G. Harms. 1980. Pattern of plasma luteinizing hormone in the cyclic cow: Dependence upon the period of the cycle. Endocrinology 107:498-503.
18. Snedecor, G. W., and W. G. Cochran. 1989. Statistical Methods 8th ed. Iowa State Univ. Press, Ames.
19. Stegner, J. E., J. F. Bader, F. N. Kojima, M. R. Ellersieck, M. F. Smith, and D. J. Patterson. 2004. Fixed-time artificial insemination of postpartum beef cows at 72 or 80 hours after treatment with the MGA® Select protocol. Theriogenology 61:1299-1305.
20. Thatcher, W. W., F. Moreira, J. E. P. Santos, R. C. Mattos, F. L. Lopes, S. M. Pancarci, and C. A. Risco. 2001. Effects of hormonal treatments on reproductive performance and embryo production. Theriogenology 55:75-89.
21. Walters, D. L., and E. Schallenberger. 1984. Pulsatile secretion of gonadotropins, ovarian steroids and ovarian oxytocin during the periovulatory phase of the oestrus cycle in the cow. J. Reprod. Fertil. 71:503-512.
22. Walters, D. L., D. Schams, and E. Schallenberger. 1984. Pulsatile secretion of gonadotrophins, ovarian steroids and ovarian oxytocin during the luteal phase of the oestrous cycle in the cow. J. Reprod. Fertil. 71:479-91.
23. 2α estrous synchronization treatment in beef heifers. J. Anim. Sci. 79:2210-2216.