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Full-Text Articles in Animal Sciences
Tympanic Temperature In Confined Beef Cattle Exposed To Excessive Heat Load, Terry L. Mader, John B. Gaughan, Leslie J. Johnson, G. Leroy Hahn
Tympanic Temperature In Confined Beef Cattle Exposed To Excessive Heat Load, Terry L. Mader, John B. Gaughan, Leslie J. Johnson, G. Leroy Hahn
Department of Animal Science: Faculty Publications
Angus crossbred yearling steers (n=168) were used to evaluate effects on performance and tympanic temperature (TT) of feeding additional potassium and sodium to steers exposed to excessive heat load (maximum daily ambient temperature exceeded 32°C for three consecutive days) during seasonal summer conditions. Steers were assigned one of four treatments: (1) control; (2) potassium supplemented (diet containing 2.10% KHCO3); (3) sodium supplemented (diet containing 1.10% NaCl); or (4) potassium and sodium supplemented (diet containing 2.10% KHCO3 and 1.10% NaCl). Overall, additional KHCO3 at the 2% level or NaCl at the 1% level did not improve performance or heat stress tolerance …
Prediction Of Genetic Values For Feed Intake From Individual Body Weight Gain And Total Feed Intake Of The Pen, A. J. Cooper, Calvin Ferrell, Larry V. Cundiff, L. D. Van Vleck
Prediction Of Genetic Values For Feed Intake From Individual Body Weight Gain And Total Feed Intake Of The Pen, A. J. Cooper, Calvin Ferrell, Larry V. Cundiff, L. D. Van Vleck
Department of Animal Science: Faculty Publications
Records of individual feed intake (FI) and BW gain (GN) were obtained from the Germ Plasm Evaluation (GPE) program at US Meat Animal Research Center (USMARC). Animals were randomly assigned to pens. Only pens with 6 to 9 steers (n = 289) were used for this study (data set 1). Variance components and genetic parameters were estimated using data set 1. Estimated genetic values (EGV) for FI were calculated by 5 methods using single and 2-trait analyses: 1) individual FI and individual GN, 2) individual FI alone, 3) 2-trait with individual GN but with FI missing, 4) individual GN and …
Nutritional And Management Methods To Decrease Nitrogen Losses From Beef Feedlots, Galen Erickson, Terry Klopfenstein
Nutritional And Management Methods To Decrease Nitrogen Losses From Beef Feedlots, Galen Erickson, Terry Klopfenstein
Department of Animal Science: Faculty Publications
Nitrogen losses from open beef feedlots are a concern. Methods that decrease volatilization losses will lead to greater manure N, which is likely to be beneficial in open lot beef operations. Twelve or more pens were dedicated to N research whereby N intake, retention, and excretion were quantified and a mass balance conducted using manure, runoff, soil balance, and loss quantities. The objective was to decrease N volatilization losses or increase manure N or both. Dietary CP affects N excretion and N volatilization losses. Four experiments across 2 yr compared industry average CP (13%) to diets that were phase-fed to …