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T285

The impact of intake water temperatures on reticular temperatures of lactating dairy cows. J. M. Bewley*1, D. C. Batson2, M. W. Grott1, and M. M. Schutz1, 1Purdue University, West Lafayette, IN, 2MaGiiX Inc., Post Falls, ID.

T286

Predicting cow health and estrus status by measuring change in water intake in dairy cows. J. M. Lukas* and J. K. Reneau, University of Minnesota, St Paul.

T287

Factors affecting group sizes within herd and group milk volume compared to total herd volume of milk. R. C. Goodling*, K. E. Griswold, and T. J. Beck, Pennsylvania State Cooperative Extension, University Park.

T288

Milking parlor employee management on Wisconsin dairy farms. K. J. Hohmann and P. L. Ruegg*, University of Wisconsin, Madison.

T289

Bluegrass straw as a partial replacement for alfalfa hay in dairy rations. E. M. O'Rourke*, J. J. Michal, and R. L. Kincaid, Washington State University, Pullman.

T290

Scrotal circumference in performance tested bulls: prediction of measures at 365 days of age from measures at 240 days of age. J. E. Decker*, P. Luna, A. M. Encinias, and M. G. Thomas, New Mexico State University, Las Cruces.

T291

Estimation of no-return costs for different cattle identification systems in California. G. Caja*1,2, F. Haque2, J. W. Oltjen2, L. J. Butler2, J. L. Evans3, and V. J. Velez3, 1Universitat Autònoma de Barcelona, Bellaterra, Spain, 2University of California, Davis, CA, 3California Department of Food and Agriculture, Sacramento, CA.

T292

Analysis of birth weight, weaning weight, and pre-weaning gain in Simmental, Zebu and Simmental × Zebu calves on tropical pastures. J. C. Martinez-Gonzalez*1, A. Azuara-Martinez2, F. A. Lucero-Magana1, E. G. Cienfuegos-Rivas1, and S. P. Castillo-Rodriguez1, 1Agronomia y Ciencias, Universidad Autonoma de Tamaulipas, Ciudad Victoria, Tamaulipas, Mexico, 2Direccion General de Educacion Tecnologica Agropecuaria, Ciudad Victoria, Tamaulipas, Mexico.

T293

Economic strategies for stocking rate and supplementation of stockers grazing rye-ryegrass pastures. F. M. Rouquette, Jr.*1 and L. Ortega2, 1Texas A&M University System Agricultural Research & Extension Center, Overton, 2Agronomy Department, University of Zulia, Venezuela, Zulia, Venezuela.

T294

Development of a model for noninvasive evaluation of energy profiles in beef cows. J. F. Odhiambo*, E. E. Felton, R. Helmondollar, J. Y. Pritchard, P. I. Osborne, and R. A. Dailey, West Virginia University, Morgantown.

T295

Effects of waste products from plant materials on in vitro rumen fermentation. D. Tedesco*, S. Stella, L. Garavaglia, C. Barbieri, and S. Galletti, University of Milan, Italy.

T296

Rumen degradation ratios: comparison of frost-damaged wheat with normal wheat. P. Yu* and V. Racz, University of Saskatchewan, Saskatoon, SK, Canada.

T297

Available protein, structural and non-structural carbohydrates: comparison of frost-damaged wheat with normal wheat. P. Yu* and V. Racz, University of Saskatchewan, Saskatoon, SK, Canada.

T298

Modelling nutrient supply to dairy cattle from normal and frozen sheat: Comparison of the National Research Council-2001 model with the DVE/OEB system. P. Yu*, R. Racz, and J. McKinnon, University of Saskatchewan, Saskatoon, SK, Canada.

T299

Feed values of barley varieties could be determined using in vitro gas production technique. M. Rinne1, S. Ahvenjärvi1, M. Holma2, and P. Huhtanen*1,3, 1MTT Agrifood Reserach Finland, Jokioinen, Finland, 2RehuRaisio Ltd., Raisio, Finland, 3Cornell University, Cornell, NY.

T300

Effect of an exogenous fibrolytic enzyme on in vivo digestibility of King grass hay. J. H. Avellaneda-Cevallos*1, G. Quintana-Zamora1, F. Espinoza-Torrico1, O. Montañez-Valdez2, I. Espinoza-Guerra1, R. Luna-Murillo1, S. González-Muñoz3, and J. Tuárez-Cobeña1, Facultad de Ciencias Pecuarias, Unidad de Investigación Cientifica y Tecnológica, Universidad Técnica Estatal de Quevedo, Quevedo, Los Rios, Ecuador, 2Divisíon de Bienestar y Desarrollo Regional, Departamento de Desarrollo Regional, Universidad de Guadalajara, Ciudad Guzmán, Municipio de Zapotlán, Jalisco, México, 3Colegio de Postgraduados, Texcoco, Estado de México, México.

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T301

Effects of Bovazyme WP™ on microbial efficiency and metabolism in continuous culture of rumen contents. B. P. House*, L. Holden, and G. A. Varga, Pennsylvania State University, University Park.

T302

Effects of yeast and type of starch on pH fluctuation, nutrient digestion and microbial fermentation in a dual flow continuous culture system. D. Moya*, S. Calsamiglia, A. Ferret, and M. C. Fuentes, Universitat Autonoma de Barcelona, Barcelona, Spain.

T303

Screening for the effects of commercial additives at two pH levels on in vitro rumen microbial fermentation of a high-concentrate beef cattle diet. D. Moya*, S. Calsamiglia, A. Ferret, and J. I. Fandiño, Universitat Autonoma de Barcelona, Barcelona, Spain.

T304

Effect of fibrolytic enzyme application to diets differing in concentrate proportion on the performance of lactating dairy cattle. K. G. Arriola*, A. T. Adesogan, S. C. Kim, T. W. Kang, C. M. Huisden, and C. R. Staples, University of Florida, Gainesville.

Ruminant Nutrition II Exhibit Hall C

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