Pregnancy rates after timed AI of heifers following removal of intravaginal progesterone inserts

Journal of Dairy Science

Volumn 87, Issue 9, 2004, Pages 2868-2873

  Peeler, I D ^a   Nebel, R L ^a   Pearson, R E ^a   Swecker, W S ^a   Garcia, A ^a  

^a VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY   (United States)

Author keywords

Dairy heifer; Intravaginal progesterone insert; Reproductive performance; Timed artificial insemination

Indexed keywords

BOVINAE; INSERTION SEQUENCES;

EID: 4544351077     PISSN: 00220302     EISSN: None     Source Type: Journal    
DOI: 10.3168/jds.S0022-0302(04)73416-5     Document Type: Article

References (13)

1. Adams, G. P., M. Caccia, M. Martínez, R. A. Pierson, and R. J. Mapletoft. 1995. Ovarian follicular wave emergence after treatment with progesterone and estradiol in cattle. Anim. Reprod. Sci. 39:193-204.
2. Bó, G. A., G. P. Adams, R. A. Pierson, H. E. Tribulo, M. Caccia, and R. J. Mapletoft. 1994. Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant. Theriogenology 41:1555-1569.
3. Bó, G. A., D. R. Bergfelt, R. A. Pierson, G. P. Adams, and R. J. Mapletoft. 2000. Local versus systemic effects of exogenous estradiol on ovarian follicular dynamics in heifers with progestogen ear implants. Anim. Reprod. Sci. 59:141-157.
4. Colazo, M. G., J. P. Kastelic, and R. J. Mapletoft. 2003. Effects of estradiol cypionate (ECP) on ovarian follicular dynamics, synchrony of ovulation, and fertility in CIDR-based, fixed-timed AI programs in beef heifers. Theriogenology 60:855-865.
5. Colazo, M. G., J. P. Kastelic, M. F. Martinez, P. R. Whittaker, R. Wilde, J. D. Ambrose, R. Corbett, and R. J. Mapletoft. 2004. Fertility following fixed-time AI in CIDR-treated beef heifers given GnRH or estradiol cypionate and fed diets supplemented with flax seed or sunflower seed. Theriogenology 61:1115-1124.
6. Hanlon, D. W., N. B. Williamson, J. J. Wichtel, I. J. Steffert, A. L. Craigie, and D. U. Pfeiffer. 1996. The effect of estradiol benzoate administration on estrous response and synchronization pregnancy rate in dairy heifers after treatment with exogenous progesterone. Theriogenology 45:775-785.
7. Hanlon, D. W., N. B. Williamson, J. J. Wichtel, I. J. Steffert, A. L. Craigie, and D. U. Pfeiffer. 1997. Ovulatory responses and plasma luteinizing hormone concentration in dairy heifers after treatment with exogenous progesterone and estradiol benzoate. Theriogenology 47:963-975.
8. 2α for synchronizing estrus and shortening the interval to pregnancy in postpartum beef cows, peripubertal beef heifers, and dairy heifers. J. Anim. Sci. 79:982-995.
9. Macmillan, K. L., and A. J. Peterson. 1993. Anew intravaginal progesterone-releasing device for cattle (CIDR-B) for estrous synchronization, increasing pregnancy rates and the treatment of post-partum anestrus. Anim. Reprod. Sci. 33:1-25.
10. Nebel, R. L., and S. M. Jobst. 1998. Evaluation of systematic breeding programs for lactating dairy cows. J. Dairy Sci. 81:1169-1174.
11. 2α and GnRH. Theriogenology 44:915-923.
12. Pursley, J. R., M. C. Wiltbank, J. S. Stevenson, J. S. Ottobre, H. A. Garverick, and L. L. Anderson. 1997. Pregnancy rates per artificial insemination for cows and heifers inseminated at a synchronized ovulation or synchronized estrus. J. Dairy Sci. 80:295-306.
13. SAS User's Guide. 1999. Statistics, Version 8, Edition 1. SAS Inst., Inc., Cary, NC.