251 (45’)

Ovarian Follicular Development and Synchronization of Estrus and Ovulation in Cattle J. P. Kastelic, R. J. Mapletoft, M. Colazo, M. F. Martinez Canada

252	Improving Fixed Time Artificial Insemination (FTAI) Pregnancy Rates in the Ovsynch (OV) Program in Non-cycling Lactating Dairy Cattle F. Cochrane, R. Shephard, M. D'Occhio Australia

253	Effects of Treatment of Dairy Cows "Not-detected in Oestrus" with Gonadotrophin Releasing Hormone, Prostaglandin and Progesterone S. McDougall New Zealand

254	Plasma Progesterone Profiles in Non-Lactating Holstein Friesian Cows and Japanese Black Beef Cows after an Intra-Vaginal Insertion of two Types of Intra-Vaginal Progesterone Device with Different Contents of Progesterone C. Yoshida, T. Nakao, S. Long Japan

255	Control of Oestrus with a Progesterone Intravaginal Device (Prid®): Comparison of 2 Insertion Durations S. Floc'H, F. Deletang, S. Freret, C. Ponsart, D. Remmy France

256	Effect of Progesterone Supplementation Post Conception on Embryo Survival Rate in Heifers M. Beltman, P. Lonergan, J. Roche, M. Diskin, M. Crowe Ireland

257	Effects of Gonadotropin-Releasing Hormone Five Days Post-Insemination on Luteal Function and Pregnancy Rate in Synchronized Beef Cattle G. Richarson, J. Wichtel, J. Duynesveld, J. Spears Canada