COMMON ABBREVIATIONS Abbreviation Term ADFI Average daily feed intake ADG Average daily gain avg Average BW Body weight cc Cubic centimeter cm Centimeter CP Crude protein CV Coefficient <strong>of</strong> variation cwt 100 pounds d Day(s) DM Dry matter DNA Deoxyribonucleic acid °C Degrees Celsius °F Degrees Fahrenheit EPD Expected progeny difference F/G Feed:gain ratio FSH Follicle stimulating hormone ft Foot or feet g Grams(s) gal Gallon(s) h Hour(s) in Inch(es) IU International units kcal Kilocalorie(s) kg Kilogram(s) lb Pound(s) L Liter(s) LH Lutenizing hormone m Meter(s) mg Milligram(s) Meq Milliequivalent(s) Mcg Microgram(s) min Minute(s) mm Millimeter(s) mo Month(s) N Nitrogen NS Not significant ng Nanogram(s) ppb Parts per billion ppm Parts per million r Correlation coefficient r 2 Simple coefficient <strong>of</strong> determination R 2 Multiple coefficient <strong>of</strong> determination s Second(s) SD Standard deviation SE Standard error SEM Standard error <strong>of</strong> the mean TDN Total digestible nutrients wk Week(s) wt Weight yr Year(s)
TABLE OF CONTENTS Instruction in Milk Production Using a Tour <strong>of</strong> Diverse Farms D. W. Kellogg...................................................................................................................................................................................................7 Demographics and Academic Success <strong>of</strong> Animal Science Graduate Students C. F. Rosenkrans, Jr., Z. B. Johnson, and W. K. Coblentz.............................................................................................................................10 Efficacy <strong>of</strong> Mannan Oligosaccharide (Bio-Mos ® ) as a Complete or Partial Replacement for Zinc Oxide in the Diets <strong>of</strong> Weanling Pigs E. Davis, D. Brown, S. Singh, C. Maxwell, and Z. Johnson...........................................................................................................................13 Efficacy <strong>of</strong> Mannan Oligosaccharide (Bio-Mos ® ) Addition With and Without Copper Sulfate in the Diets <strong>of</strong> Growing-Finishing Pigs E. Davis, D. Brown, B. de Rodas, C. Maxwell, and Z. Johnson....................................................................................................................18 Effects <strong>of</strong> Dietary Magnesium and Halothane Genotype on Performance and Carcass Traits <strong>of</strong> Growing-Finishing Swine J. K. Apple, C. V. Maxwell, M. R. Stivarius, L. K. Rakes, and Z. B. Johnson.................................................................................................22 Effects <strong>of</strong> Supplemental Manganese on Performance and Pork Quality <strong>of</strong> Growing Finishing Swine W. J. Roberts, J. K. Apple, C. V. Maxwell, L. K. Rakes, J. N. Leach, J. R. Jimenez, and C. B. Boger...............................................................29 Effect <strong>of</strong> Feather Meal on Live Animal Performance and Carcass Quality and Composition <strong>of</strong> Growing-Finishing Swine C. B. Boger, J. K. Apple, D. C. Brown, C. V. Maxwell, W. J. Roberts, Z. B. Johnson, L. K. Rakes, and J. Stephenson.......................................................................................................................................................................32 Maternal Effects for Performance Test Data <strong>of</strong> Four Breeds <strong>of</strong> Swine Z. B. Johnson, J. J. Chewning, and R. A. Nugent III......................................................................................................................................38 Effect <strong>of</strong> Treatment to Temporarily Block Germinal Vesicle Breakdown on Porcine Oocyte Maturation and Subsequent Parthenogenetic Development T. R. Bilby and R. W. Rorie..............................................................................................................................................................................45 Genetic Parameter Estimates <strong>of</strong> Yearling Live Animal Ultrasonic Measurements in Brangus Cattle M. Stelzleni, T. L. Perkins, A. H. Brown, Jr., F. W. Pohlman, Z. B. Johnson, and B. A. Sandelin.................................................................49 Breed-Type x Forage Interaction for Mature Weight and Rate <strong>of</strong> Maturing for Angus, Brahman, and Reciprocal Cross Cows B. A. Sandelin, A. H. Brown, Jr., M. A. Brown, Z. B. Johnson, and A. M. Stelzleni.........................................................................................53 Supplementation <strong>of</strong> Beef Cows and Heifers Consuming High Quality Fescue Hay D. L. Kreider, R. W. Rorie, N. Post, and K. Cole.............................................................................................................................................56 Growth-Performance and Shrink by Stocker Calves Grazing Bermudagrass Pastures and Fed Different Levels <strong>of</strong> Grain Sorghum K. C<strong>of</strong>fey, W.K. Coblentz, and G. Montgomery...............................................................................................................................................61 Influence <strong>of</strong> Fish Oil Addition on Growth Performance and Immune Function <strong>of</strong> Grazing Cattle T. J. Wistuba, E. B. Kegley and J. K. Apple.....................................................................................................................................................63 Influence <strong>of</strong> Supplementing Cobalt in the Receiving Ration on Performance <strong>of</strong> Heifers New to the Feedlot Environment T. J. Wistuba, E. B. Kegley, D. L. Galloway, J. A. Hornsby, and S. M. Williamson........................................................................................66 The Effect <strong>of</strong> Tasco TM Inclusion in the Prepartum Diet and Time <strong>of</strong> Sampling on the Proportions <strong>of</strong> Bovine Leukocyte Populations in Blood and Mammary Gland Secretions T. J. Wistuba, E. B. Kegley, T. K. Bersi, D. W. Kellogg, and G. F. Erf...........................................................................................................69 Clostridial Immune Response in Beef Cattle That Develop Lesions at the Injection Site T. R. Troxel, M. S. Gadberry, W. T. Wallace, D. L. Kreider, J. D. Shockey, E. A. Colburn, P. Widel, and I. Nicholson...............................73 Long-Term Immune Response <strong>of</strong> Beef Heifers Injected with Either a Single or Multiple Dose Clostridial Toxoid M. S. Gadberry, T. R. Troxel, D. L. Kreider, P. Widel, and I. Nicholson........................................................................................................76 Examination <strong>of</strong> Hospital Pen Management for Stocker Cattle Operations J. Robins, S. Krumpelman, and D. H. Hellwig................................................................................................................................................79 <strong>Arkansas</strong> Steer Feedout Program 1999-2000 T. Troxel, G. Davis, S. Gadberry, S. McPeake and W. Wallace.......................................................................................................................83 Small Grain Forage for Stocker Cattle Production L. B. Daniels, K. F. Harrison, D. S. Hubbell, III, and Z. B. Johnson...............................................................................................................88 Evaluation <strong>of</strong> Cultivars <strong>of</strong> S<strong>of</strong>t Red Winter Wheat for Forage for Stocker Cattle Production L. B. Daniels, K. F. Harrison, D. S. Hubbell, III, and Z. B. Johnson.............................................................................................................91