Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Publication Year
Articles 31 - 35 of 35
Full-Text Articles in Genetics and Genomics
Occurrence Of Hormonal Residues In Feedlot Cattle Waste, Terry L. Mader, Leslie J. Johnson, Shannon L. Bartelt-Hunt, Daniel D. Snow, William Kranz, Charles Shapiro, Simon Van Donk, David P. Shelton, David Tarkalson, T. C. Zhang, Steve Ensley
Occurrence Of Hormonal Residues In Feedlot Cattle Waste, Terry L. Mader, Leslie J. Johnson, Shannon L. Bartelt-Hunt, Daniel D. Snow, William Kranz, Charles Shapiro, Simon Van Donk, David P. Shelton, David Tarkalson, T. C. Zhang, Steve Ensley
Department of Animal Science: Faculty Publications
Two identically designed studies were conducted in separate years at the UNL Haskell Agricultural Laboratory using 192 crossbred heifers (96/study). Within a study heifers (initial weight = 386kg) were randomly assigned to 2 groups (3 42.4 m × 14.6 m pens/group/year): 1) treatment (TRT) animals were administered synthetic hormones via subcutaneous implants [d 1, 36 mg zearalonal; d 35, 140 mg trenbolone acetate (TBA) and 14 mg of 17β-estradiol benzoate (Revalor-H)] and fed Melengesterol Acetate (MGA), and 2) control (CON) animals with no synthetic hormone provided. Throughout each study, feedlot pen surface samples were obtained from 4 equally-sized zones (5 …
Smooth Bromegrass Pasture Beef Growing Systems: Fertilization Strategies And Economic Analysis, A. K. Watson, T. J. Klopfenstein, Walter H. Schacht, G. E. Erickson, D. R. Mark, Matt K. Luebbe, K. R. Brink, Matthew A. Greenquist
Smooth Bromegrass Pasture Beef Growing Systems: Fertilization Strategies And Economic Analysis, A. K. Watson, T. J. Klopfenstein, Walter H. Schacht, G. E. Erickson, D. R. Mark, Matt K. Luebbe, K. R. Brink, Matthew A. Greenquist
Department of Animal Science: Faculty Publications
In recent years, prices for N fertilizer have increased dramatically, reducing net returns of fertilized pasture systems. A 5-yr study from 2005 to 2009 was conducted to evaluate management strategies and relative differences in profitability for 3 methods of backgrounding calves on smooth bromegrass pastures. Forty-five steers were used each year for a total of 225 animals in a randomized complete block design. Treatments included pastures fertilized in the spring with 90 kg N/ha (FERT), nonfertilized pastures with calves supplemented daily with dried distillers grains plus solubles (DDGS) at 0.6% of BW (SUPP), and control (CONT) pastures that had no …
Technical Note: Estimating Beef-Cattle Forage Demand: Evaluating The Animal Unit Concept, T. L. Meyer, L. A. Stalker, J. D. Volesky, D. C. Adams, R. N. Funston, T. J. Klopfenstein, Walter H. Schacht
Technical Note: Estimating Beef-Cattle Forage Demand: Evaluating The Animal Unit Concept, T. L. Meyer, L. A. Stalker, J. D. Volesky, D. C. Adams, R. N. Funston, T. J. Klopfenstein, Walter H. Schacht
Department of Animal Science: Faculty Publications
The objective of this experiment was to evaluate the effect of BW and physiological status of a beef animal on forage intake. The experiment was repeated over 2 yr with 6 replications of 3 treatments per year: cow-calf pair (CCP, BW = 629 kg), nonlactating cow (NLC, BW = 503 kg), and yearling steer (YS, BW = 305 kg). The CCP was treated as one unit, with the sum of cow BW and calf BW comprising CCP BW. Calves averaged 42 d of age and 73 kg at the start of the experiment each year. Animals were housed in individual …
Calving Date And Wintering System Effects On Cow And Calf Performance I: A Systems Approach To Beef Production In The Nebraska Sandhills, W. A. Griffin, L. A. Stalker, D. C. Adams, R. N. Funston, T. J. Klopfenstein
Calving Date And Wintering System Effects On Cow And Calf Performance I: A Systems Approach To Beef Production In The Nebraska Sandhills, W. A. Griffin, L. A. Stalker, D. C. Adams, R. N. Funston, T. J. Klopfenstein
Department of Animal Science: Faculty Publications
A 4-yr study using 217 cows/yr (3/4 Red Angus, 1/4 Simmental) evaluated effects of calving date and wintering system on cow and calf performance from birth to harvest. Cows were assigned to 1 of 5 treatments: 1) March (Mar) calving cows wintered on native range, 2) Mar calving cows wintered on corn residue, 3) June (Jun) calving cows wintered on native range, 4) Jun calving cows wintered on corn residue, and 5) August (Aug) calving cows wintered on corn residue. Steers born in Mar entered the feedlot at weaning (calf-fed). Steers and heifers born in Jun and Aug were divided …
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 …