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Energy cost of cows' grazing activity: Estimation in large plots. A. Brosh*, Z. Henkin, E. D. Ungar, A. Dolev, A. Orlov, Y. Shabtay, Y. Yehuda, and Y. Aharoni, Beef Cattle Section, Newe Yaar Research Center, ARO, Israel.

8:45 AM

932

Relationships among exit velocity, cortisol, and carcass characteristics of beef heifers. R. R. Reuter1,2, J. D. Dailey*2, J. A. Carroll2, M. S. Brown3, and M. L. Galyean1, 1Texas Tech University, Lubbock, 2USDA-ARS Livestock Issues Research Unit, Lubbock, TX, 3West Texas A&M University, Canyon.

9:00 AM

933

Evaluation of a mathematical model to estimate total feed required for pen-fed animals based on performance and diet information. B. M. Bourg*1, L. O. Tedeschi1, and M. S. Brown2, 1Texas A&M University, College Station, 2West Texas A&M University, Canyon.

9:15 AM

BREAK

9:30 AM

934

Genetic trends for feed intake, average daily gain, mid-test weight and residual feed intake in a population of Angus cattle selected for feed efficiency. D. P. Kirschten*1, E. J. Pollak1, D. R. Strohbehn2, and D. Warden3, 1Cornell University, Ithaca, NY, 2Iowa State University, Ames, 3Wardens Farm, Council Bluffs, IA.

9:45 AM

935

Relationship between residual feed intake and ultrasonic measures of body composition in yearling performance tested bulls. T. L. Perkins*, J. L. Drury, and A. Rimal, Missouri State University, Springfield.

10:00 AM

936

Characterization of residual feed intake and relationships with serum insulin-like growth factor-I in growing Brangus heifers. P. A. Lancaster*1, G. E. Carstesn1, J. G. Lyons1, T. H. Welsh, Jr.1, R. D. Randel2, and T. D. A. Forbes3, 1Texas Agricultural Experiment Station, College Station, 2Texas Agricultural Experiment Station, Overton, 3Texas Agricultural Experiment Station, Uvalde.

10:15 AM

937

Feed efficiency and residual feed intake of Nelore young bulls selected for yearling weight. R. Almeida*1, R. F. Nardon2, A. G. Razook2, L. A. Figueiredo2, and D. P. D. Lanna3, 1Universidade Federal do Paraná, Paraná, Brazil, 2Instituto de Zootecnia, São Paulo, Brazil, 3ESALQ/USP, São Paulo, Brazil.

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Thursday, July 12

SYMPOSIA AND ORAL SESSIONS

Beef Species II Feed Intake and Efficiency Chair: Denny Crews, Agriculture and Agri-Food Canada 214 B

Prediction of lamb carcass leg and loin weights using leg score and leg width measurements. M. R. Mousel*1, T. D. Leeds1, D. R. Notter2, and H. N. Zerby3, 1USDA-ARS U.S. Sheep Experiment Station, Dubois, ID, 2Virginia Polytechnic Institute and State University, Blacksburg, 3The Ohio State University, Columbus.

8:30 AM

8:45 AM

Influence of body weight and body condition score at breeding on conception and prolificacy of Merino and Composite Coopworth, East Friesian, Romney and Texel sheep in Tasmania, Australia. A. E. O. Malau-Aduli*1, G. H. Bond1, and M. Dunbabin2, 1University of Tasmania, Hobart, Tasmania 7001, Australia, 2Bangor, Dunalley, Tasmania 7177, Australia.

938

Breeding and Genetics - Livestock and Poultry Analyses and Methods II Chair: Curt Van Tassell, USDA - ARS 207 B

Genetic parameters estimation for Test Day Model evaluation in Italy. F. Canavesi* and S. Biffani, ANAFI, Cremona, Italy.

939

Use of a mathematical computer model to predict feed intake in Angus cattle: Genetic parameters between observed and predicted values, and relationships with other traits. D. P. Kirschten*, E. J. Pollak, and D. G. Fox, Cornell University,

Body weight changes and subsequent lambing rates of western white-faced ewes grazing winter range. J. B. Taylor*, C. A. Moffet, and T. D. Leeds, USDA, ARS, U. S. Sheep Experiment Station, Dubois, ID.

Changes in metabolic and endocrine measurements during feed restriction in dairy ewes with different BCS. G. Pulina*1, G. C. Bomboi2, A. Mazzette1, B. Floris2, C. Dimauro1, S. P. G. Rassu1, and A. Nudda1, 1Dipartimento di Scienze Zootecniche - Università di Sassari, Sassari, Italy, 2Dipartimento di Biologia Animale - Università di Sassari, Sassari, Italy.

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