Evaluation of Gonadotropin-Releasing Hormone at Fixed-Time Artificial Insemination in Beef Heifers Synchronized Using a Modified CO-Synch Plus Controlled Internal Device Release Protocol

Professional Animal Scientist

Volumn 21, Issue 6, 2005, Pages 449-454

  Walker, R S ^a   Enns, R M ^b   Geary, T W ^c   Mortimer, R G ^b   Lashell, B A ^b   Zalesky, D D ^a  

^a UNIVERSITY OF MINNESOTA   (United States)

^b Department of Environmental and Radiological Health Sciences   (United States)

^c AGRICULTURAL RESEARCH SERVICE   (United States)

Author keywords

Beef Heifers; Controlled Internal Device Release; Fixed Time Artificial Insemination; Ovulation Synchronization

Indexed keywords

EID: 85008237721     PISSN: 10807446     EISSN: 1525318X     Source Type: Journal    
DOI: 10.15232/S1080-7446(15)31249-3     Document Type: Article

References (21)

1. Anderson, L.H., McDowell, C.M., Day, M.L., Progestin-induced puberty and secretion of luteinizing hormone in heifers. Biol. Reprod., 54, 1996, 1025.
2. Dalton, J.C., Nadir, S., Blame, J.H., Noftsinger, M., Nebel, R.L., Saacke, R.G., Effect of time of insemination on number of accessory sperm, fertilization rate, and embryo quality in nonlactating dairy cattle. J. Dairy Sci., 84, 2001, 2413.
3. Geary, T.W., Whittier, J.C., Effects of timed insemination following synchronization of ovulation using the Ovsynch or CO-Synch protocol in beef cows. Prof. Anim. Sci., 14, 1998, 217.
4. Ginther, O.J., Kastlic, J.P., Knopf, L., Composition and characteristics of follicular waves during the bovine estrous cycle. Anim. Reprod. Sci, 28, 1989, 187.
5. Grieger, D.M., Roberts, A.J., Reeves, J.J., Timing of the preovulatory surge of LH at oestrus does not influence conception rate in beef cattle. Anim. Reprod. Sci., 24, 1991, 205.
6. Hendricks, D.M., Dickey, J.F., Niswender, G.D., Serum luteinizing hormone and plasma progesterone levels during the estrous cycle and early pregnancy in cows. Biol. Reprod., 2, 1970, 346.
7. Mapletoft, R.J., Martinez, M.F., Colazo, M.G., Kastelic, J.P., The use of controlled internal drug release devices for the regulation of bovine reproduction. J. Anim. Sci., 81(E.Suppl. 2), 2003, E28.
8. Martinez, M.F., Kastelic, J.P., Adams, G.P., Cook, R.B., Olsen, W.O., Mapletoft, R.J., The use of progestins in regimens for fixed-time artificial insemination in beef cattle. Theriogenology, 57, 2002, 1049.
9. 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., 78, 2000, 1568.
10. Odde, K.G., A review of synchronization of estrus in postpartum cattle. J. Anim. Sci., 68, 1990, 817.
11. Perry, G.A., Smith, M.F., Lucy, M.C., Green, J.A., Parks, T.E., MacNeil, M.D., Roberts, A.J., Geary, T.W., Relationship between follicle size at insemination and pregnancy success. Proc. Natl. Acad. Sci., 102, 2005, 5268.
12. Pursley, J.R., Kosorok, M.R., Wiltbank, M.C., Reproductive management of lactating dairy cows using synchronization of ovulation. J. Dairy Sci., 77(Suppl. 1), 1994, 69 (Abs.).
13. 2α and GnRH. Theriogenology, 44, 1995, 915.
14. 1 Richardson, A. M., B. A. Hensley, T. J. Marple,S. K. Johnson, and J. S. Stevenson. Characteristics of estrus before and after first insemination and fertility of heifers after synchronized estrus using GnRH, PGF2α, and progesterone.J. Anim. Sci. 80:2792.
15. Saacke, R.G., Factors affecting fertilization in estrous synchronized cattle.In Proc. Appl. Reprod. Strategies in Beef Cattle Worksh., Manhattan,KS. Kansas State Univ., Manhattan., 2002, 163.
16. Savio, J.D., Boland, M.P., Hynes, N., Roche, J.F., Resumption of follicular activity in the early post-partum period of dairy cows. J. Reprod. Fertil., 88, 1990, 569.
17. Schmitt, E.J.-P., Diaz, T., Drost, M., Thatcher, W.W., Use of a GnRH-agonist for a timed-insemination protocol in cattle. J. Dairy Sci., 77(Suppl. 1), 1994, 292 (Abs.).
18. Schmitt, E.J.-P., Drost, M., Diaz, T., Roomes, C., Thatcher, W.W., Effect of a gonadotropin releasing hormone agonist on follicle recruitment and pregnancy rate in cattle. J. Anim. Sci, 74, 1996, 154.
19. Thompson, K.E., Stevenson, J.S., Lamb, G.C., Grieger, D.M., Löest, C.A., Follicular, hormonal, and pregnancy responses of early postpartum suckled beef cows to GnRH, norgestomet, and prostaglandin F2α. J. Anim. Sci., 77, 1999, 1823.
20. Twagiramungu, H., Guilbault, L.A., Dufour, J.J., Synchronization of ovarian follicular waves with a gonadotropin-releasing hormone agonist to increase the precision of estrus in cattle: A review. J. Anim. Sci, 73, 1995, 3141.
21. Twagiramungu, H.G., Roy, G.L., Laverdiére, G., Dufour, J.J., Fixed-time insemination in cattle after synchronization of estrus and ovulation with GnRH and prostaglandin. Theriogenology, 43, 1995, 341 (Abs.).