The Environmental Impact of Growth-Promoting Compounds Employed by the United States Beef Cattle Industry: History, Current Knowledge, and Future Directions

2008 ◽  
pp. 1-30 ◽  
Author(s):  
Alan S. Kolok ◽  
Marlo K. Sellin
Keyword(s):  
United States ◽  
Environmental Impact ◽  
Beef Cattle ◽  
Current Knowledge ◽  
The United States ◽  
Future Directions ◽  
Cattle Industry ◽  
Growth Promoting

scholarly journals Applications of an Animal Model in the United States Beef Cattle Industry

1988 ◽  
Vol 71 ◽  
pp. 35-53 ◽  
Author(s):  
L.L. Benyshek ◽  
M.H. Johnson ◽  
D.E. Little ◽  
J.K. Bertrand ◽  
L.A. Kriese
Keyword(s):  
United States ◽  
Animal Model ◽  
Beef Cattle ◽  
The United States ◽  
Cattle Industry

scholarly journals 144 Rumen Fluid Metabolites as Potential Biomarkers of Feed Efficiency in Angus Steers

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 51-52
Author(s):  
Brooke A Clemmons ◽  
Joshua B Powers ◽  
Shawn R Campagna ◽  
Taylor B Ault ◽  
Mallory M Embree ◽  
...  
Keyword(s):  
United States ◽  
Beef Cattle ◽  
Feed Efficiency ◽  
Rumen Fluid ◽  
The United States ◽  
Cattle Industry ◽  
Total Input ◽  
Cattle Herds ◽  
Syringe Filter ◽  
Potential Biomarkers

Abstract Beef cattle is the most consumed red meat in the United States, and the United States is the largest producer and consumer of beef cattle globally. Feed is one of the largest input costs for the beef cattle industry, accounting for 40–60% of the total input costs. Identifying methods for improving feed efficiency in beef cattle herds could result in decreased cost to both producers and consumers, as well as increased animal protein available for global consumption. Identification of feed efficiency biomarkers could aid in the selection of more feed-efficient animals. To identify potential biomarkers of feed efficiency, rumen fluid was collected from low- (n = 14) and high-RFI (n = 15) Angus steers based on RFI ± 0.5 SD around the mean following a 70d feed efficiency trial to determine rumen metabolites associated with variations in feed efficiency. Steers were 7 months of age, weighing 264±2.7 kg. Rumen fluid was collected via gastric tubing, filtered through a 0.22 µM syringe filter, extracted for metabolomic analysis using 0.1% formic acid in acetonitrile:water:methanol (2:2:1), and injected into the Dionex UltiMate 3000 UHPLC system with an Exactive Plus Orbitrap MS. Peaks for known metabolites were identified using MAVEN and analyzed using MetaboAnalyst 4.0 and SAS. Significance was determined using an α ≤ 0.05. Based on fold change (high/low RFI), eight metabolites were greater in low-RFI steers compared to high-RFI steers, including 3,4-dihydroxyphenylacetate, 4-pyridoxate, citraconate, hypoxanthine, succinate/methylmalonate, thymine, uracil, and xylose (P ≤ 0.05), while 12 metabolites differed by ≥ 2-fold. These metabolites were predominantly involved in amino acid and lipid metabolism. Rumen fluid metabolomes differed in steers of varying feed efficiencies. These metabolites may be used as biomarkers of feed efficiency and may provide insight as to factors contributing to differences in feed efficiency that may be exploited to improve feed efficiency in beef cattle herds.

scholarly journals 143 Rumen Fluid Metabolites as Potential Biomarkers of Feed Efficiency in Angus Steers

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 17-17
Author(s):  
Brooke A Clemmons ◽  
Joshua B Powers ◽  
Shawn R Campagna ◽  
Taylor B Ault ◽  
Mallory M Embree ◽  
...  
Keyword(s):  
United States ◽  
Beef Cattle ◽  
Feed Efficiency ◽  
Rumen Fluid ◽  
The United States ◽  
Cattle Industry ◽  
Total Input ◽  
Cattle Herds ◽  
Syringe Filter ◽  
Potential Biomarkers

Abstract Beef cattle is the most consumed red meat in the United States, and the United States is the largest producer and consumer of beef cattle globally. Feed is one of the largest input costs for the beef cattle industry, accounting for 40–60% of the total input costs. Identifying methods for improving feed efficiency in beef cattle herds could result in decreased cost to both producers and consumers, as well as increased animal protein available for global consumption. Identification of feed efficiency biomarkers could aid in the selection of more feed-efficient animals. To identify potential biomarkers of feed efficiency, rumen fluid was collected from low- (n = 14) and high-RFI (n = 15) Angus steers based on RFI ± 0.5 SD around the mean following a 70-d feed efficiency trial to determine rumen metabolites associated with variations in feed efficiency. Steers were 7 mo of age, weighing 264±2.7 kg. Rumen fluid was collected via gastric tubing, filtered through a 0.22 µM syringe filter, extracted for metabolomic analysis using 0.1% formic acid in acetonitrile:water:methanol (2:2:1), and injected into the Dionex UltiMate 3000 UHPLC system with an Exactive Plus Orbitrap MS. Peaks for known metabolites were identified using MAVEN and analyzed using MetaboAnalyst 4.0 and SAS. Significance was determined using an α ≤ 0.05. Based on fold change (high/low RFI), eight metabolites were greater in low-RFI steers compared to high-RFI steers, including 3,4-dihydroxyphenylacetate, 4-pyridoxate, citraconate, hypoxanthine, succinate/methylmalonate, thymine, uracil, and xylose (P ≤ 0.05), while 12 metabolites differed by ≥ 2-fold. These metabolites were predominantly involved in amino acid and lipid metabolism. Rumen fluid metabolomes differed in steers of varying feed efficiencies. These metabolites may be used as biomarkers of feed efficiency and may provide insight as to factors contributing to differences in feed efficiency that may be exploited to improve feed efficiency in beef cattle herds.

scholarly journals The Economics of Carcass Beef Production: An Appraisal of Florida's Feedlot Potential

1978 ◽  
Vol 10 (2) ◽  
pp. 49-55 ◽  
Author(s):  
J. Walter Prevatt ◽  
Bryan E. Melton ◽  
Thomas H. Spreen ◽  
W. Kary Mathis
Keyword(s):  
United States ◽  
Beef Cattle ◽  
The United States ◽  
Beef Production ◽  
Agricultural Economy ◽  
Cattle Industry

The production of beef cattle has historically been an important component of the Southeast's agricultural economy. In 1977 the region had 24.6 million cattle and calves, accounting for more than 28 percent of the total mature beef animals in the United States [3]. Despite this large and active cattle industry, however, the region is substantially deficient in carcass beef production.

scholarly journals (144) Rumen Fluid Metabolites as Potential Biomarkers of Feed Efficiency in Angus Steers

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 66-66
Author(s):  
Brooke A Clemmons ◽  
Joshua B Powers ◽  
Shawn R Campagna ◽  
Taylor B Ault ◽  
Mallory M Embree ◽  
...  
Keyword(s):  
United States ◽  
Beef Cattle ◽  
Feed Efficiency ◽  
Rumen Fluid ◽  
The United States ◽  
Cattle Industry ◽  
Total Input ◽  
Cattle Herds ◽  
Syringe Filter ◽  
Potential Biomarkers

Abstract Beef cattle is the most consumed red meat in the United States, and the United States is the largest producer and consumer of beef cattle globally. Feed is one of the largest input costs for the beef cattle industry, accounting for 40–60% of the total input costs. Identifying methods for improving feed efficiency in beef cattle herds could result in decreased cost to both producers and consumers, as well as increased animal protein available for global consumption. Identification of feed efficiency biomarkers could aid in the selection of more feed-efficient animals. To identify potential biomarkers of feed efficiency, rumen fluid was collected from low- (n = 14) and high-RFI (n = 15) Angus steers based on RFI ± 0.5 SD around the mean following a 70d feed efficiency trial to determine rumen metabolites associated with variations in feed efficiency. Steers were 7 months of age, weighing 264±2.7 kg. Rumen fluid was collected via gastric tubing, filtered through a 0.22 µM syringe filter, extracted for metabolomic analysis using 0.1% formic acid in acetonitrile:water:methanol (2:2:1), and injected into the Dionex UltiMate 3000 UHPLC system with an Exactive Plus Orbitrap MS. Peaks for known metabolites were identified using MAVEN and analyzed using MetaboAnalyst 4.0 and SAS. Significance was determined using an α ≤ 0.05. Based on fold change (high/low RFI), eight metabolites were greater in low-RFI steers compared to high-RFI steers, including 3,4-dihydroxyphenylacetate, 4-pyridoxate, citraconate, hypoxanthine, succinate/methylmalonate, thymine, uracil, and xylose (P ≤ 0.05), while 12 metabolites differed by ≥ 2-fold. These metabolites were predominantly involved in amino acid and lipid metabolism. Rumen fluid metabolomes differed in steers of varying feed efficiencies. These metabolites may be used as biomarkers of feed efficiency and may provide insight as to factors contributing to differences in feed efficiency that may be exploited to improve feed efficiency in beef cattle herds.

scholarly journals Current knowledge of Chagas-related heart disease among pediatric cardiologists in the United States

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Sanchi Malhotra ◽  
Imran Masood ◽  
Noberto Giglio ◽  
Jay D. Pruetz ◽  
Pia S. Pannaraj
Keyword(s):  
United States ◽  
Differential Diagnosis ◽  
Heart Disease ◽  
Chagas Disease ◽  
Latin American ◽  
Current Knowledge ◽  
Parasitic Infection ◽  
The United States ◽  
Cardiac Complications ◽  
The U.S

Abstract Background Chagas disease is a pathogenic parasitic infection with approximately 8 million cases worldwide and greater than 300,000 cases in the United States (U.S.). Chagas disease can lead to chronic cardiomyopathy and cardiac complications, with variable cardiac presentations in pediatrics making it difficult to recognize. The purpose of our study is to better understand current knowledge and experience with Chagas related heart disease among pediatric cardiologists in the U.S. Methods We prospectively disseminated a 19-question survey to pediatric cardiologists via 3 pediatric cardiology listservs. The survey included questions about demographics, Chagas disease presentation and experience. Results Of 139 responses, 119 cardiologists treat pediatric patients in the U.S. and were included. Most providers (87%) had not seen a case of Chagas disease in their practice; however, 72% also had never tested for it. The majority of knowledge-based questions about Chagas disease cardiac presentations were answered incorrectly, and 85% of providers expressed discomfort with recognizing cardiac presentations in children. Most respondents selected that they would not include Chagas disease on their differential diagnosis for presentations such as conduction anomalies, myocarditis and/or apical aneurysms, but would be more likely to include it if found in a Latin American immigrant. Of respondents, 87% agreed that they would be likely to attend a Chagas disease-related lecture. Conclusions Pediatric cardiologists in the U.S. have seen very few cases of Chagas disease, albeit most have not sent testing or included it in their differential diagnosis. Most individuals agreed that education on Chagas disease would be worth-while.

scholarly journals The United States Eye Injury Registry: Past and Future Directions

Ophthalmology ◽  
2020 ◽  
Author(s):  
Ariel Chen ◽  
Gerald McGwin ◽  
Grant A. Justin ◽  
Fasika A. Woreta
Keyword(s):  
United States ◽  
The United States ◽  
Eye Injury ◽  
Future Directions
Sign in / Sign up

Export Citation Format

Share Document