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OF UNIVERSE UBWW IIUNOIS nM S" to 'hetZ'yfr™%'i resP°"*le for L161— Q-1096 Digitized by the Internet Archive in 2011 with funding from University of Illinois Urbana-Champaign http://www.archive.org/details/beefresearchrepo1998univ 71 ',%.<"•<> -172 VIA 1 5 3?* A mr \6rX Q3S Agriculture Experiment Station Cooperative Extension Service UniversityofIllinoisatUrbana-Champaign HelpingYouPutKnowledgetoWork Robert A. Easter, Head Other faculty and staff involved with beef cattle research and extension. L.L. Berger T.R. Carr Jim Dahlquist G.C. Fahey i t D.B. Faulkner F.A. Ireland D.J. Kesler F.K. McKeith N.R. Merchen T.G. Nash D.F. Parrett R.S. Wells THANK YOU THE DEPARTMENT OF ANIMAL SCIENCES GRATEFULLY ACKNOWLEDGES THE ASSISTANCE OF THE FOLLOWING COMPANIES AND PEOPLE IN OUR BEEF PROGRAM ADM, Decatur, IL Ajinomoto, Eddyville, IA KY Alltech Inc., Nicholasville, American Breeders Service, DeForest, WI NE Baldridge Angus Ranch, North Platte, Central Soya, Decatur, IN Corn Products, Argo, IL Robert Douglas, LTD, Robinson, IL Elanco, Greenfield, IN Fats and Proteins Research Foundation, Bloomington, IL Forsythe Land and Cattle, Marshall, IL Growmark, Bloomington, IL GTA Feeds, Sioux Falls, SD Hoechst-Roussel Agri-Vet, Somerville, NJ Hoffman-LaRoche Inc., Nutley, NJ Illinois BeefAssociation, Springfield, IL Illinois Corn Marketing Board, Bloomington, IL Illinois Soybean Program Operating Board, Bloomington, IL InterAg (DEC International, Inc.), Hamilton, New Zealand Intervet International, Boxmeer, The Netherlands Lonza, Fairlawn, NJ GA Merial, Inc., Athens, Milk Specialties Company, Dundee, IL MSD MO Agvet, St. Louis, Moorman Manufacturing, Quincy, IL Pharmacia/Upjohn Company, Kalamazoo, MI Primeline Genetics, Overland Park, KS MO Purina Mills, St. Louis, Shady Brook Angus Farms, Leoma, TN Sunny Valley Angus, Yorkville, IL VetLife, Winterset, IA VOLUME 25 CONTENTS BEEF NUTRITION AND MANAGEMENT PERFORMANCE OF NURSING CALVES FED SUPPLEMENT WITH VARYING PROTEIN LEVELS 2 COMPARISON OF THREE WEANING AGES ON COW-CALF PERFORMANCE AND STEER CARCASS TRAITS 9 PERFORMANCE AND CARCASS TRAITS OF EARLY WEANED STEERS RECEIVING EITHER A PASTURE GROWING PERIOD OR A FINISHING RATION AT WEANING 22 EFFECTS OF PRENATAL ANDROGENIZATION AND IMPLANTATION ON FEEDLOT PERFORMANCE AND CARCASS COMPOSITION OF SINGLE-CALF HEIFERS 41 EFFECTS OF LACTATIONAL STATUS ON THE PERFORMANCE AND CARCASS COMPOSITION OF 30-MONTH-OLD HEIFERS IN THE SINGLE-CALF HEIFER SYSTEM 51 EFFECTS OF ENERGY INTAKE LEVEL DURING THE GROWING PHASE ON FEEDLOT STEER PERFORMANCE AND CARCASS COMPOSITION 57 THE EFFECTS OF CORN MILLING CO-PRODUCTS ON GROWTH PERFORMANCE AND DIET DIGESTIBILITY BY BEEF CATTLE 67 SITES OF ORGANIC MATTER, FIBER, AND STARCH DIGESTION IN STEERS FED FRESH ALFALFA AND SUPPLEMENTED WITH INCREASED LEVELS OF CRACKED CORN 79 SITES OF PROTEIN AND AMINO ACID DIGESTION IN STEERS FED FRESH ALFALFA AND SUPPLEMENTED WITH INCREASED LEVELS OF CRACKED CORN 91 FORAGE QUALITY OF ALFALFA AND GRASS DURING THE FIRST SPRING GROWTH IN CENTRAL ILLINOIS 102 COMPOSITION OF FRESH FORAGES DURING THE SPRING GROWTH 110 EFFECTS OF SPECIES AND STAGES OF MATURITY OF FRESH FORAGES ON IN SITU DRY MATTER AND CRUDE PROTEIN DEGRADATION 120 A SUMMARY OF THE ILLINOIS IRM-SPA BEEF COW BUSINESS RECORD 132 REPRODUCTION AND PHYSIOLOGY EFFECT OF PROSTAGLANDIN F -AND GONADOTROPIN RELEASING 2a HORMONE-INDUCED LUTEINIZING HORMONE RELEASES ON OVULATION AND CORPUS LUTEUM FUNCTION OF BEEF COWS 139 EFFECT OF GONADOTROPIN RELEASING HORMONE ON PREGNANCY RATES OF BEEF HEIFERS AND COWS ESTRUS-SYNCHRONIZED WITH MELENGESTROL ACETATE AND PROSTAGLANDIN F 149 2a EFFECT OF METHOD OF SYNCHRONIZATION, TWO INJECTIONS OF PGF 2a, VS GnRH AND PGF ON CORPORA LUTEA DEVELOPMENT AND REGRESSION 2a, AND SYNCHRONIZED PREGNANCY RATES: A PRELIMINARY REPORT 162 EFFICACY OF SUSTAINED RELEASE NEEDLE-LESS CEFTIOFUR SODIUM IMPLANTS IN TREATING CALVES WITH BOVINE RESPIRATORY DISEASE 165 GONADORELIN-INDUCED TESTOSTERONE RELEASE: A BIOLOGICAL ASSAY FOR QUALITY ASSURANCE OF GONADORELIN 179 ADMINISTRATION OF PHARMACEUTICALS AND VACCINES VIA REMOTE DELIVERY IN BIODEGRADABLE, NEEDLE-LESS IMPLANTS 190 PREGNANCY DETECTION VIA THE EARLY CONCEPTION FACTOR ASSAY: A PRELIMINARY REPORT 203 NORGESTOMET IMPLANTS ENHANCE EMBRYO SURVIVAL IN POSTPARTUM COWS: A PRELIMINARY REPORT 206 ESTRUS RESPONSE AND PREGNANCY RATES OF BEEF FEMALES ADMINISTERED INTRAVAGINAL PROGESTERONE INSERTS AND PGF FOR 2a ESTRUS SYNCHRONIZATION: A PRELIMINARY REPORT 212 MOUNTING ACTIVITY DETECTED BY MEANS OF MOUNTING ACTIVITY MONITORS OF BEEF FEMALES ADMINISTERED SYNCRO-MATE B FOR ESTRUS SYNCHRONIZATION 215