Kristin E Hales
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404 Energy balance and net energy for maintenance of beef × dairy crossbred steers. Open
Our objective was to determine the partitioning of energy in beef × dairy crossbred steers fed at 2 multiples of maintenance and to determine their net energy for maintenance (NEm) requirement. Beef × dairy crossbred cattle make up approxi…
Ghrelin modulates innate immune and ileal responses to lipopolysaccharide administration in weaned pigs Open
Ghrelin is a hormone that is mainly produced in the stomach and is known to stimulate feed intake. Recent evidence suggests that ghrelin may affect immunity. This study evaluated whether repeated administrations of ghrelin prior to and fol…
Influence of source of origin and region of finishing on growth performance and carcass characteristics of finishing heifers fed in the United States Open
The objective was to evaluate growth performance and carcass traits of finishing beef heifers sourced and finished in different regions in the U.S. Heifers (n = 190; initial body weight [BW] 483 ± 0.4 kg and 425 ± 1.9 kg for South Dakota […
View article: Net zero initiative in U.S. beef and dairy systems: integrative on-farm recommendations for greenhouse gas reduction
Net zero initiative in U.S. beef and dairy systems: integrative on-farm recommendations for greenhouse gas reduction Open
Beef and dairy production systems play an important role in society, providing a variety of ecosystem services. U.S. beef and dairy production systems require being aligned with the global and national effort to stabilize the anthropogenic…
473 Evaluation of hematology outcomes as indicators of liver abscess formation in beef × dairy cross steers Open
Our objective was to evaluate hematological measurements that could be indicative of liver abscesses (LA) in weaned beef × dairy cross steers. Beef × dairy cross steers [n = 40; initial body weight (BW) = 120 ± 12 kg] were sourced from a l…
91 Awardee Talk: Using respiration calorimetry to estimate energy balance to estimate energy balance and methane emissions Open
Understanding relationships between chemical components of the diet and methane production will allow nutritionists to develop formulation strategies to decrease methane emissions. Diets that produce acetate liberate hydrogen that can be u…
PSIV-18 Prevalence and concentrations of <i>Fusobacterium necrophorum subsp. necrophorum</i> in gut contents and tissues in steers with experimentally induced liver abscesses Open
Liver abscesses (LA) continue to be an economic challenge for the beef industry. Chronic ruminal acidosis and ruminitis contribute to LA development. Fusobacterium necrophorum subsp. necrophorum, a ruminal bacterium, is the primary causati…
Ileal epithelial tissue transcript profiles of steers with experimentally induced liver abscesses*† Open
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Development of an experimental model for liver abscess induction in Holstein steers using an acidotic diet challenge and bacterial inoculation Open
Holstein steers (n = 40; initial BW = 84.9 ± 7.1 kg) were used to study the genesis of liver abscesses (LA) using an acidotic diet challenge with or without intraruminal bacterial inoculation. Steers were housed in individual pens inside a…
Random metaphylaxis effects on health outcomes, complete blood count, antimicrobial use, and growth performance of high-risk beef steers* Open
© 2023, The Authors. Published by Elsevier Inc. and Fass Inc. on behalf of the American Registry of Professional Animal Scientists. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/…
104 Development of an Experimental Model to Induce Liver Abscesses in Steers Using an Acidotic Diet Challenge and Oral Bacterial Inoculation Open
The objective of this study was to develop a model for liver abscesses (LA) in Holstein steers by using an acidotic diet or acidotic diet plus intraruminal inoculation of Fusobacterium necrophorum, Salmonella enterica serotype Lubbock, and…
105 The Effects of Roughage Neutral Detergent Fiber Concentration and Bulk Density of Steam-Flaked Corn on Performance, Carcass Characteristics, and Liver Abscesses in Finishing Beef Steers Open
We evaluated the effects of dietary neutral detergent fiber (NDF) concentration from alfalfa hay and bulk density of steam-flaked corn (SFC) on growth performance, carcass characteristics, and liver abscesses in finishing beef steers. Cros…
106 Using a Novel Direct-Fed Microbial as an Alternative for Tylosin Phosphate to Control Liver Abscesses and Decrease Antimicrobial Use in Finishing Beef Steers Open
Our objective was to evaluate the use of a novel direct-fed microbial as an alternative to antimicrobials to decrease liver abscesses in feedlot cattle. Angus beef steers (n = 240; initial BW = 263 ± 18.0 kg) were used in a randomized comp…
311 Evaluation of Post-Transit Growth Performance and Carcass Characteristics of Feedlot Heifers Sourced and Finished in Different Regions of the U.S Open
The objective was to evaluate growth performance and carcass traits following transit of feedlot heifers sourced and finished in different geographical regions in the U.S. Yearling heifers [n = 190; initial body weight (BW) 483 and 425 kg …
103 Development of a Novel, Experimental, Minimally Invasive Model to Investigate the Genesis and Etiology of Liver Abscesses in Cattle Open
Most research surrounding liver abscesses involves post-hoc evaluation of naturally occurring abscesses in production settings. Few studies have been designed to experimentally induce abscesses with the purpose of identifying a time course…
174 Longitudinal Assessment of Prevalence and Incidence of <i>Salmonella</i> and <i>Escherichia Coli</i> O157 Resistance to Antimicrobials in Feedlot Cattle Sourced and Finished in Two Regions of the U.S Open
The objective was to investigate the influence of cattle origin and region of finishing on the prevalence of Salmonella, Escherichia coli O157:H7, and select antimicrobial resistance in E. coli populations. Yearling heifers (n = 190) were …
175 Effects of Random Metaphylaxis Administered at Feedlot Arrival to 0, 33, 66, Or 100% of High-Risk Beef Cattle on Health Outcomes, Complete Blood Count, and Growth Performance Open
Our objective was to evaluate the effects of random metaphylaxis administered on arrival to 0, 33, 66, or 100% of high-risk beef cattle on clinical health, growth performance, and complete blood cell counts during a 35-d receiving period. …
Infrared thermography or rectal temperature as qualification for targeted metaphylaxis in newly received beef steers and the effects on growth performance, complete blood count, and serum haptoglobin during a 42-day feedlot receiving period* Open
© 2023 None
Infrared thermography as an alternative technique for measuring body temperature in cattle Open
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An updated profile of the bovine acute phase response following an intravenous lipopolysaccharide challenge Open
The objective was to provide an updated profile of the bovine acute-phase response to include recent advancements in technologies and expanded hematological, cytokine, and serum chemistry variables. Beef steers (n = 32; body weight [BW] = …
Effects of long-term postgastric infusion of casein or glutamic acid on small intestinal starch digestion and energy balance in cattle Open
The objective of this experiment was to evaluate effects of postruminal flows of casein or glutamic acid on small intestinal starch digestion and to quantify changes in energy and nutrient balance. Twenty-four steers (body weight = 179 ± 4…
Short communication: evaluation of an endotoxin challenge and intraruminal bacterial inoculation model to induce liver abscesses in Holstein steers Open
Holstein steers (n = 40; initial body weight [BW] = 96.0 ± 10.5 kg) were individually housed in a climate-controlled barn to evaluate potential models for the genesis of liver abscesses (LA). In this 2 × 2 factorial, steers were balanced b…
The effects of administering different metaphylactic antimicrobials on growth performance and health outcomes of high-risk, newly received feedlot steers Open
Bovine respiratory disease (BRD) is the primary animal health concern facing feedlot producers. Many antimicrobial mitigation strategies are available, but few studies have compared feedlot performance during both the receiving and finishi…
54 The Effect of Supplementing Clostat 500 (Bacillus Subtilis PB6) to Yearling Steers in a Commercial Feedyard on Health, Salmonella spp. Prevalence, Feedlot Performance and Carcass Characteristics Open
Crossbred beef steers, n = 2,100; 313 ± 38 kg initial body weight (BW) were used to evaluate Bacillus Subtilis PB6 supplementation to yearling steers. Cattle were blocked by arrival date and assigned randomly to pen within block; pens were…