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G. Sa Filho1, R. L. Valarelli2, and J. L. M. Vasconcelos1, 1FMVZ - UNESP, Botucatu, Brazil, 2Pfizer Animal Health, Brazil.

T248

Effect of treatment with melengestrol acetate combined with estradiol cypionate on pregnancy rates along a 70 days breeding season in postpartum Nellore cows. R. F. G. Peres*1, O. G. Sa Filho1, R. L. Valarelli2, and J. L. M. Vasconcelos1, 1FMVZ - UNESP, Botucatu, Brazil, 2Pfizer Animal Health, Brazil.

T249

Effect of estradiol cypionate dosage (1 vs. 2 mg) on estrus detection and pregnancy rates of postpartum Nellore cows synchronized with melengestrol acetate. R. L. Valarelli*1, O. G. Sa Filho2, and J. L. M. Vasconcelos2, 1Pfizer Animal Health, Brazil, 2FMVZ - UNESP, Botucatu, Brazil.

T250

Pregnancy rates in a 10 days breeding season in postpartum Nellore cows treated with melengestrol acetate associated or not with estradiol cypionate. R. L. Valarelli*1, O. G. Sa Filho2, M. Meneghetti2, and J. L. M. Vasconcelos2, 1Pfizer Animal Health, Brazil, 2FMVZ - UNESP, Botucatu, Brazil.

T251

Fixed-time artificial insemination in replacement beef heifers after treatment with human chorionic gonadotropin (hCG), progesterone, and prostaglandin F2α. G. C. Lamb1, J. E. Larson*1, C. R. Dahlen2, and G. Marquezini1, 1North Central Research and Outreach Center, University of Minnesota, Grand Rapids, 2Northwest Research and Outreach Center, Crookston, MN.

T252

Artificial insemination of superovulated Angus cows using sexed or conventionally frozen semen. G. C. Lamb*1, B. J. Lovaas1, S. L. Bird1, A. Martins1, J. E. Larson1, J. C. Rodgers1, D. J. Frank2, and D. M. Williams2, 1North Central Research and Outreach Center, University of Minnesota, Grand Rapids, 2ABS Global, Inc., DeForest, WI.

T253

Effect of length of treatment with melengestrol acetate (7 vs. 13 days) prior to induction of ovulation on occurrence of short cycle in anestrous Nellore cows. O. G. Sa Filho*1, R. L. Valarelli2, and J. L. M. Vasconcelos1, 1FMVZ - UNESP, Botucatu, Brazil, 2Pfizer Animal Health, Brazil.

T254

Effect of length of exposure to exogenous progesterone (3 vs. 6 days) prior to induction of ovulation on premature luteolysis in anestrous Nellore cows. O. G. Sá Filho*, C. R. Zilioti, and J. L. M. Vasconcelos, FMVZ - UNESP, Botucatu, Brazil.

T255

Ovarian and hormonal responses to a progesterone releasing intravaginal device (PRID) treatment in the presence or absence of estradiol from the early luteal phase in heifers. T. Kuroiwa*, T. Tanaka, and H. Kamomae, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan.

T256

A stochastic model to compare breeding system costs for synchronization of estrus and AI to natural service. S.K. Johnson* and R.D. Jones, Kansas State University, Manhattan.

T257

Different estrus syncryonization protocols in sheep. B. R. Avila1, M. T. Sánchez1, E. O. García*2, O. D. Montañez-Valdez3, P. M Molina1, J. G. Peralta1, M. E. Ortega1, and J. L. Cordero1, 1Colegio de Postgraduados, Montecillo, Estado de México, México, 2Centro Universitario de la Costa Sur de la Universidad de Guadalajara, Aútlan, Jalisco, México, 3Centro Universitario del Sur de la Universidad de Guadalajara, Ciudad Guzmán, Jalisco, México.

T258

Treatment with bST during progestin synchronization increases the blastocyst rate in ewes. A. Montero, J. Hernández, J. Valencia, C. G. Gutiérrez, S. Rojas, and J. Hernández-Cerón*, Facultad de Medicina Veterinaria y Zootecnia. Universidad Nacional Autónoma de México., Mexico.

T259

Effect of estradiol–17β supplementation at the last GnRH of the Ovsynch protocol in lactating dairy cows. A. P. Cunha*, J. N. Guenther, E. P. B. Silva, J. B. C. Heijink, and M. C. Wiltbank, University of Wisconsin, Madison.

T260

Effect of GnRH after TAI on subsequent Resynch fertility. A. P. Cunha*, J. A. Powell, J. N. Guenther, E. P. B. Silva, and M. C. Wiltbank, University of Wisconsin, Madison.

T261

Human chorionic gonadotropin (hCG) and GnRH influences pregnancy survival and resynchronized ovulation before timed AI in Holstein cattle. B. S. Buttrey*, M. G. Burns, and J. S. Stevenson, Kansas State University, Manhattan.

T262

Logistic regression analysis for relationship between the timing of the resumption of normal ovarian cycles and metabolic status in postpartum dairy cows. C. Kawashima*, M. Matsui, E. Kaneko, C. Amaya Montoya, T. Shimizu, N. Matsunaga, K. Kida, Y-I. Miyake, and A. Miyamoto, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan.

T263

Does synchronization protocol affect conception in lactating dairy cows? J. L. M. Vasconcelos*1, R. M. Santos2, B. L. Cardoso1, F. M. Abreu1, L. H. Cruppe1, and S. Soriano3, 1FMVZ- UNESP, Botucatu, SP, Brazil, 2UFU, Uberlandia, MG, Brazil, 3Faz Colorado, Araras, SP, Brazil.

T264

Effect of physiological status on the concentrations of progesterone maintained by CIDRs in Holstein cattle. K. T. Wolf*, A. K. Sanders, D. L. Ray, and W. J. Silvia, University of Kentucky, Lexington.

T265

Effect of flunixin meglumine at days 15 and 16 after TAI on pregnancy rates in lactating Holstein cows. L. F. M. Pfeifer1, J. L. M. Vasconcelos*2, A. Schneider1, J. Wilson Neto1, N. J. L. Dionello1, P. Duarte1, L. Meneghelo1, M. N. Correa1, A. Guzeloglu3, and W. W. Thatcher4, 1UF Pelotas, Pelotas, Brazil, 2FMVZ, Botucatu, Brazil, 3Selcuk University, Konya, Turkey, 4University of Florida, Gainesville.

T266

Effect of GnRH administered four days after synchronization of ovulation and timed AI on fertility of anovular lactating dairy cows. R. A.

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