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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.

2:30 PM


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.

2:45 PM


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.

3:00 PM


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.

3:15 PM


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.


3:30 PM


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.

3:45 PM


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.

4:00 PM


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.

4:15 PM


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.

4:30 PM


Effects of different cryopreservation methods on the glyocalyx of chicken spermatozoa. J. Pelaez and J. A. Long*, Beltsville Agricultural Research Center, Beltsville.

4:45 PM


Testicular development in meishan and commercial crossbred prepubertal boars. J. J. Ford*, U.S. Meat Animal Research Center, Clay Center, NE.

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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


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SYMPOSIUM Production, Management & the Environment - Livestock and Poultry The Evolving National Animal Identification System Chair: John Paterson, Montana State 214 D

Introductions. John Paterson.

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Update on the National Animal Identification System. Neil Hammerschmidt.

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The Canadian Livestock Traceability System. J. M. Stitt*, Canadian Cattle Identification Agency, Calgary, Alberta, Canada.

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3:45 PM

Report on NAIS Pilot Projects and Field Trials. David Morris.

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