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Full-Text Articles in Life Sciences
Fertilization And Supplementation Strategies For Steers Grazing Smooth Bromegrass Pastures, Andrea K. Watson
Fertilization And Supplementation Strategies For Steers Grazing Smooth Bromegrass Pastures, Andrea K. Watson
Department of Animal Science: Dissertations, Theses, and Student Research
Since 2004, fertilizer prices have doubled due to increases in energy prices for production and increased demand for N fertilizer due to high grain prices. This leads to questioning the cost effectiveness of increasing forage production with N fertilizer. At the same time, an increase in ethanol production creates an increase in the production of by-products of the ethanol industry, such as distillers grains. Distillers grains have been shown to be an excellent feed for ruminants both as a supplement while grazing and as part of a complete diet in the feedlot. Distillers grains provide protein, fat, and highly digestible …
Estimating Livestock Forage Demand: Defining The Animal Unit, Tonya L. Meyer
Estimating Livestock Forage Demand: Defining The Animal Unit, Tonya L. Meyer
Department of Animal Science: Dissertations, Theses, and Student Research
The objective of this experiment was to evaluate the effect of a beef animal’s physiological status on forage intake. The experiment was repeated over two years with six replications of three treatments per year: cow-calf pair (CC; BW = 629 kg), dry cow (DC; BW = 503 kg), and yearling steer (S; BW = 305 kg). The cow and calf were treated as one unit, with cow BW and calf BW comprising CC BW. Calves were approximately 42 d of age and weighing 73 kg at the start of each year. Animals were housed in individual pens and fed high …
Effects Of Maternal Nutrition On Conceptus Growth And Offspring Performance: Implications For Beef Cattle Production, Richard N. Funston, David M. Larson, K. A. Vonnahme
Effects Of Maternal Nutrition On Conceptus Growth And Offspring Performance: Implications For Beef Cattle Production, Richard N. Funston, David M. Larson, K. A. Vonnahme
West Central Research and Extension Center, North Platte
Developmental programming is the concept that a maternal stimulus or insult at a critical period in fetal development has long-term effects on the offspring. Historically, considerable effort has been made to understand how nutrition influences health and productivity during the postnatal period. Whereas maternal nutrition during pregnancy plays an essential role in proper fetal and placental development, less is known about how maternal nutrition affects the health and productivity of the offspring. Conceptus growth is sensitive to direct and indirect effects of maternal dietary intake. Even from the earliest stages of embryonic life, when nutrient requirements for conceptus growth are …
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 …
Review: Preweaning, Postweaning, And Carcass Trait Comparisons For Progeny Sired By Subtropically Adapted Beef Sire Breeds At Various Us Locations, F. A. Thrift, J. O. Sanders, M. A. Brown, A. H. Brown Jr, A. D. Herring, D. G. Riley, S. M. Derouen, J. W. Holloway, W. E. Wyatt, R. C. Vann, C. C. Chase Jr., D. E. Franke, L. V. Cundiff, J. F. Baker
Review: Preweaning, Postweaning, And Carcass Trait Comparisons For Progeny Sired By Subtropically Adapted Beef Sire Breeds At Various Us Locations, F. A. Thrift, J. O. Sanders, M. A. Brown, A. H. Brown Jr, A. D. Herring, D. G. Riley, S. M. Derouen, J. W. Holloway, W. E. Wyatt, R. C. Vann, C. C. Chase Jr., D. E. Franke, L. V. Cundiff, J. F. Baker
Roman L. Hruska U.S. Meat Animal Research Center: Reports
This review, which represents a summarization of research results generated during an approximately 22-yr period, involves preweaning, postweaning, and carcass trait comparisons of progeny sired by Bos indicus (Brahman, Boran, Nellore, Indu-Brazil, Gir, Sahiwal), B. indicus-derivative (Brangus, Beefmaster, Santa Gertrudis, Gelbray, Simbrah), non-B. indicus (Tuli, Romosinuano, Bonsmara, Senepol) subtropically adapted, and traditional Bos taurus (Angus, Hereford, Charolais, Gelbvieh, Red Poll) sire breeds. Relative to Brahman-sired progeny, preweaning (weaning weight) and postweaning (postweaning ADG, feedlot ADG, final feedlot BW) performance is expected to be less for progeny sired by non-B. indicus subtropically adapted sire breeds. The non-B. indicus subtropically adapted sire …