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W101

Effect of morphological traits on intake characteristics of four grass species found in temperate biodiverse pasture systems. K. J. Soder* and M. A. Sanderson, USDA-ARS, Pasture Systems & Watershed Mgmt. Research Unit,, University Park, PA.

W102

Estimation of forage intake and the presence of alkaloids in ruminal fluid and forage in steers grazing three different fescue types. R. L. Stewart, Jr*, G. Scaglia, J. P. Fontenot, W. S. Swecker, Jr., A. O. Abaye, J. H. Fike, and M. A. McCann, Virginia Polytechnic and State University, Blacksburg.

W103

Efficacy of EndoFighter™ for stocker cattle grazing endophyte-infected tall fescue pastures during late summer and fall. R. Norman1, C. D. Lane1, S. S. Block2, W. W. Gill1, A. E. Fisher1, R. L. Mills1, B. T. Campbell1, F. N. Schrick1, and J. C. Waller*1, 1University of Tennessee, Department of Animal Science, Knoxville, 2ADM Animal Nutrition Research, Decatur, IL.

W104

Effect of cultivar and defoliation frequency on forage yield of Chloris gayana kunth in a moderate saline soil of the semiarid chaco of Argentina. M. V. Cornacchione*1, H. E. Pérez2, and A. E. Fumagalli1,3, 1Instituto Nacional de Tecnología Agropecuaria, Santiago del Estero, Argentina, 2Instituto Nacional de Tecnología Agropecuaria, Leales, Tucumán, Argentina, 3Universidad Nacional de Santiago del Estero, Santiago del Estero, Argentina.

W105

Effect of herbage depletion on cattle grazing dynamics in wheat pastures. P. Gregorini* , M. Bowman3, W. Coblentz4, P. A. Beck2, and S. A. Gunter2, 1USDA–ARS, University Park, PA, 2University of Arkansas SWREC, Hope, University of Arkansas, Fayetteville, 4USDA– ARS, Madison, WI.

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W106

Evaluation of ryegrass-based pastures grazed under the leaf stage concept in commercial dairy farms in the highlands of Costa Rica. J. Ml. Sánchez*1,2, L. Villalobos1,3, and A. Martínez1,2, 1Universidad de Costa Rica, San José, 2Centro de Investigación en Nutrición Animal, San José, Costa Rica, 3Escuela de Zootecnia, San José, Costa Rica.

W107

Supplementation of digestible fiber and glucomannan to tall fescue pastures: Dry matter intake and fecal alkaloid concentration. R. L. Mills*1,2, C. J. Richards2, and J. C. Waller1, 1The University of Tennessee, Knoxville, 2Oklahoma State University, Stillwater.

W108

Evaluation of endomycorrhizal colonization in three species of crassulacean acid metabolism in northern part of Mexico. J. R. Martinez*1, M. A. Peña2, R. E. Vazquez1, E. Gutierrez1, E. Olivares1, J. A. Vidales1, and R. D. Valdez3, 1Facultad de Agronomia, UANL, Monterrey, Mexico, 2INIFAP, General Teran, Mexico, 3CRUCeN, Universidad de Chapingo, Zacatecas, Mexico.

W109

Evaluation of EndoFighter™ in a tall fescue grazing system for beef cattle. A. E. Fisher*1, S. S. Block2, K. J. Daniels2, M. A. Franklin2, N. A. Pyatt2, and J. C. Waller1, 1University of Tennessee, Department of Animal Science, Knoxville, 2ADM Animal Nutrition Research, Decatur, IL.

W110

Changes in chemical composition and vertical distribution of kura clover-reed canarygrass swards relative to days of regrowth. K. L. Kammes*, D. K. Combs, and K. A. Albrecht, University of Wisconsin, Madison.

W111

Growth performance and immune function of fall-born beef calves weaned from endophyte infected tall fescue pastures on different dates in the dpring. J. D. Caldwell*1, K. P. Coffey1, W. K. Coblentz2, R. K. Ogden2, M. L. Looper , D. L. Kreider1, J. A. Jennings4, D. S. Hubbell, III1, T. W. Hess1, and C. F. Rosenkrans, Jr. , University of Arkansas, Fayetteville, University of Arkansas, Fayetteville, 3USDA- ARS, Marshfield, WI, 4USDA-ARS, Marshfield, WI, USDA-ARS, Booneville, AR, 6University of Arkansas, Fayetteville, 7Cooperative Extension Service, Little Rock, AR, 8University of Arkansas, Fayetteville, 9University of Arkansas, Fayetteville, 10University of Arkansas, Fayetteville.

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W112

Intensive short duration grazing of fescue pastures to extend the grazing season of winter wheat. W. A. Phillips*, B. K. Northup, and B. C. Venuto, USDA-ARS Grazinglands Research Laboratory, El Reno, OK.

W113

Growth and reproductive performance of heifers grazing Jesup tall fescue varying in endophyte status. M. E. Drewnoski*, E. J. Oliphant, J. T. Green, jr, M. E. Hockett, and M. H. Poore, North Carolina State University, Raleigh.

W114

Comparison of bloat potential between hard red and soft red winter wheat. M. S. Akins*1, E. B. Kegley1, K. P. Coffey1, K. S. Lusby1, W. K. Coblentz2, R. K. Bacon1, J. C. Moore1, J. D. Caldwell1, and J. V. Skinner Jr.1, 1University of Arkansas, Fayetteville, 2USDA-ARS, Marshfield, WI.

W115

The effect of initial spring grazing date and stocking rate on sward profile during the main grazing season. E. Kennedy*1,2, M. O'Donovan1, F. O'Mara2, and L. Delaby3, 1Teagasc, Dairy Production Research Centre, Moorepark, Fermoy, Co. Cork, Ireland, 2School of Agriculture, Food Science and Veterinary Medicine, UCD, Belfield, Dublin, Ireland, 3INRA, UMR Production du Lait St. Gilles, France.

W116

Comparing finishing beef cattle performance and forage characteristic of ryegrass (Lolium perenne), rye (Secale cereale) and oats (Avena sativa). A. C. Pereira*, E. J. Bungenstab, J. C. Lin, B. Gamble, S. P. Schmidt, C. Kerth, and R. B. Muntifering, Auburn University, Auburn, AL.

W117

Performance of stocker cattle grazing two sorghum × sudangrass hybrids under various stocking rates. K. C. McCuistion*1, F. T. McCollum2, L. W. Greene3, B. W. Bean2,3, and R. VanMeter3, 1Texas A&M University, Kingsville, 2Texas Cooperative Extension, Amarillo, 3Texas Agricultural Experiment Station, Amarillo.

W118

Nutritive value of marafalfa grass under tropical dry forest conditions. T. Clavero* and R. Razz, Facultad de Agronomia. Universidad del Zulia, Maracaibo, Zulia, Venezuela.

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