Emerging concepts regarding the integration of neuroendocrine signals that regulate gonadotropin secretion in domestic livestock. C. A. Lents*1 and C. R. Barb2, 1The University of Georgia, Athens, 2USDA-ARS, Russell Research Center, Athens, GA.
Effects of human chorionic gonadotropin (hCG) and gonadotropin releasing hormone (GnRH) on follicle and corpus luteum dynamics and concentrations of progesterone in pre-pubertal Angus heifers. C. R. Dahlen*2, J. E. Larson1, G. Marquezini1, and G. C. Lamb1, 1North Central Research and Outreach Center, University of Minnesota, Grand Rapids, 2Northwest Research and Outreach Center, University of Minnesota, Crookston.
Increasing ovulation rate reduced follicle size and increased blood progesterone concentrations but had no effect on fertility in cattle selected for twins. S. E. Echternkamp*, R. A. Cushman, and M. F. Allan, USDA, ARS, U.S. Meat Animal Research Center, Clay Center, NE.
Altered liver gene expression and reproductive function in postpartum suckled beef cows on different planes of nutrition. M. Bionaz*1, F. Samadi2, M. J. D'Occhio2,3, and J. J. Loor1, 1University of Illinois, Urbana, 2The University of Queensland, Gatton Campus, Australia, 3CRC for Beef Genetic Technologies, Gatton Campus, Australia.
Luteal function at day 30 of pregnancy in relation to serum progesterone in dairy cows at risk for late embryonic or early fetal mortality. J. D. Rhinehart*1, J. A. Flores1, R. A. Milvae2, and E. K. Inskeep1, 1West Virginia University, Morgantown, University of Connecticut, Storrs.
Effect of seminal plasma and transforming growth factor (TGF)-β1 treatment on pregnancy outcome in beef cattle. J. F. Odhiambo*1, I Holásková1, J. D. Rhinehart1, D. H. Poole2, J. M. DeJarnette3, E. K. Inskeep1, and R. A. Dailey1, 1West Virginia University, Morgantown, 2Ohio State University, Colombus, 3Select Sires Inc, Plains City, OH.
Prolactin and luteinizing hormone profiles during the reproductive cycle in the native Thai chicken. S. Kosonsiriluk1, N. Sartsoongnoen1, N. Prakobsaeng1, I. Rozenboim2, M. E. El Halawani3, and Y. Chaiseha*1, 1Suranaree University of Technology, Nakhon Ratchasima, Thailand, 2The Hebrew University of Jerusalem, Rehovot, Israel, 3University of Minnesota, Saint Paul.
The effect of active immunization against vasoactive intestinal peptide and inhibin on semen production of young and aged roosters. I. Rozenboim* and N. Avital, Hebrew University of Jerusalem, Paculty of Agriculture Dept Animal Science, Rehovot, Israel.
Chicken epiregulin (ER) gene: cDNA cloning, genomic organization, and regulation of its mRNA expression in ovarian granulosa cells. Y. Wang*, J. Li, and F. C. Leung, The University of Hong Kong, Hong Kong, HK-SAR, China.
Effects of different cryopreservation methods on the glyocalyx of chicken spermatozoa. J. Pelaez and J. A. Long*, Beltsville Agricultural Research Center, Beltsville.
Testicular development in meishan and commercial crossbred prepubertal boars. J. J. Ford*, U.S. Meat Animal Research Center, Clay Center, NE.
Transcript profiling of testes from boars divergently selected for testosterone production. M. S. Ashwell*, S. Druyan, C. M. Ashwell, and J. P. Cassady, North Carolina State University, Raleigh.
Physiology & Endocrinology - Livestock and Poultry Reproductive Physiology Chair: Mark J. Estienne, Virginia Polytechnic and State University 214 C
SYMPOSIUM Production, Management & the Environment - Livestock and Poultry The Evolving National Animal Identification System Chair: John Paterson, Montana State 214 D
Introductions. John Paterson.
Update on the National Animal Identification System. Neil Hammerschmidt.
The Canadian Livestock Traceability System. J. M. Stitt*, Canadian Cattle Identification Agency, Calgary, Alberta, Canada.
Report on NAIS Pilot Projects and Field Trials. David Morris.