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Relationship between leptin and carcass quality and yield grade in a population of Certified Angus Beef–type cattle. D. L. McNamara*1, T. B. Schmidt3, E. L. Walker4, M. M. Rolf1, A. N. Brauch1, W. Pittroff , and D. H. Keisler1, 1University of Missouri, Columbia, 2University of California, Davis, 3Mississippi State University, Starkville, 4Missouri State University, Springfield.


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Variation in maintenance energy requirements of gestating beef cows and relationships with calf performance and plasma IGF-I. M. J. Prado-Cooper*, N. M. Long, R. P. Wettemann, G. W. Horn, L. J. Spicer, and C. R. Krehbiel, Oklahoma Agricultural Experiment Station.

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Negative energy balance increases prandial ghrelin and growth hormone concentrations in lactating dairy cows. B. J. Bradford* and M. S. Allen, Michigan State University, East Lansing.

2:45 PM


Effect of ghrelin and obestatin infusion on milk production, body condition score, and energy balance in dairy cows. J. R. Roche*1,2, A. J. Sheahan1, L. M. Chagas1, D. Blache3, D. P. Berry , and J. K. Kay1, 1Dexcel, New Zealand, 2University of Tasmania, Australia, 3University of Western Australia, Australia, Teagasc Moorepark, Ireland.

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Expression of ghrelin and the growth hormone secretagogue receptor 1a (GHS-R1a) in the reproductive tissues of Holstein heifers. M. L. Rhoads*, J. B. Wheelock, L. L. Hernandez, R. P. Rhoads, and R. J. Collier, University of Arizona, Tucson.

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Seasonal effects on twenty-four hour patterns of melatonin in blood and milk of dairy cows. N. Castro*1,2, M. T. Kollmann3, V. Lollivier4, S. Richter1, A. Baumert1, O. Wellnitz1, and R. M. Bruckmaier3, 1University of Bern, Bern, Switzerland, 2Las Palmas de Gran canaria University, Las Palmas, Spain, 3Technical University Munich, Germany, 4INRA, France.

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Effect of restricted feeding and monopropylene glycol postpartum on metabolic hormones and postpartum anoestrus in grazing dairy heifers. L. M. Chagas*1, P. J. S. Gore1, K. A. Macdonald1, and D. Blache2, 1Dexcel Limited, Hamilton, New Zealand, 2The University of Western Australia, Crawley, Australia.

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Hypothalamic genes expression in early- and late-maturing Bos indicus heifers. A. Vaiciunas*1, L. L. Coutinho2, and L. F. P. Silva1, 1University of São Paulo, Pirassununga, SP, Brazil, 2University of São Paulo, Piracicaba, SP, Brazil.

4:00 PM


Evaluating reproductive and immune consequences of endocrine disrupting chemicals in an avian bioassay. M. A. Ottinger*1, E. T. Lavoie1, and M. J. Quinn2, 1University of Maryland, College Park, 2U.S. Army Center for Health Promotion and Preventive Medicine, Aberdeen, MD.

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Differential expression of adiponectin, adiponectin receptor 1 (AdipoR1) and leptin mRNA in different adipose depots in sheep. A. Lemor*1, M. Mielenz1, M. Altmann2, E. von Borell2, and H. Sauerwein1, 1University of Bonn, Germany, 2Martin- Luther-University, Halle-Wittenberg, Germany.


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Postnatal ontogeny of skeletal muscle protein synthesis in pigs. T. A. Davis*, A. Suryawan, R. A. Orellana, and M. L. Fiorotto, USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX.

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Measuring in vivo intracellular protein degradation rates in animal systems. W. G. Bergen*, Auburn University, Auburn, AL.

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The non-lysosomal Ca2+-dependent protein degradation pathway: The calpains, proteasome, and myofibrillar protein turnover. D. E. Goll*, G. Neti, S. W. Mares, and V. F. Thompson, University of Arizona, Tucson.

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The mTOR-signaling pathway in regulating metabolism and growth. X. Yang*, C. Yang, A. Farberman, C. F. M. de Lange, J. France, and M. Z. Fan, University of Guelph, Guelph, Ontario, Canada.

Physiology & Endocrinology - Livestock and Poultry Endocrinology Chair: C. Richard Barb, ARS USDA 214 C

G. E. Lanz A*3,1, M. Lucero P3,1, and J. A. Cuaron I2, 1Paiepeme A.C., Queretaro, Mexico, 2CNI-Fisiología Animal, INIFAP, Queretaro, Mexico, 3FESC UNAM, Ajuchitlan, Queretaro, Mexico.

SYMPOSIUM Nonruminant Nutrition Understanding Protein Synthesis and Degradation and Their Pathway Regulations Chair: Ming Z. Fan, University of Guelph Sponsor: Degussa 217 A

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