Reproductive Systems for North American Beef Cattle Herds

2016 ◽  
Vol 32 (2) ◽  
pp. 249-266 ◽  
Author(s):  
Robert L. Larson ◽  
Brad J. White
Keyword(s):  
Beef Cattle ◽  
North American ◽  
Reproductive Systems ◽  
Cattle Herds

Trends of the genetic connectedness measures among Nelore beef cattle herds

2011 ◽  
Vol 129 (1) ◽  
pp. 20-29 ◽  
Author(s):  
N.T. Pegolo ◽  
D. Laloë ◽  
H.N. de Oliveira ◽  
R.B. Lôbo ◽  
M.-N. Fouilloux
Keyword(s):  
Beef Cattle ◽  
Cattle Herds

PSXI-8 Heritability estimates of antibody- and cell-mediated immune response in north American angus beef cattle

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 244-245
Author(s):  
Shannon Beard ◽  
Doug C Hodgins ◽  
Julie Schmied ◽  
Jeff Caswell ◽  
Michael M Lohuis ◽  
...  
Keyword(s):  
Immune Response ◽  
Beef Cattle ◽  
North American ◽  
Animal Health ◽  
Serum Antibody ◽  
Intradermal Injection ◽  
Breeding Value ◽  
Breeding Programs ◽  
Heritability Estimates

Abstract Including immune response traits in breeding programs has been suggested as a solution to improve overall animal health and enhance disease resistance but is not yet available for Angus cattle in North America. One way to measure immune response is to use the High Immune Response (HIR™) technology, which identifies animals with superior heritable immunity by evaluating antibody-mediated (AMIR) and cell-mediated (CMIR) immune response, allowing for the calculation of an estimated breeding value for total adaptive immune response for each animal. Before HIR™ can be included in beef cattle breeding programs, genetic parameters, including heritability, must be estimated for the traits involved. The objective of this study was to estimate a preliminary heritability for AMIR and CMIR in North American Angus beef cattle. On day 0 of the phenotyping protocol, cattle were immunized intramuscularly with a preparation of type 1 (CMIR) and type 2 (AMIR) antigens with adjuvant. On day 14, cattle received an intradermal injection of 0.1 mL of the CMIR test antigen in the right tail fold, and 0.1 mL PBS in the left tail fold. Change in cutaneous double skinfold thickness after 24 hours was used to assess CMIR. Blood was collected on days 0 and 14 to evaluate serum antibody to the type 2 antigen by ELISA to quantify AMIR. Heritability estimates were calculated for Canada and the USA separately, and then for both countries combined using single-trait animal models in ASReml and are presented in Table 1. The results of this study indicate that the heritabilities of AMIR and CMIR are moderate and emphasize the potential for its inclusion into Angus breeding schemes.

Risk factors for foot and mouth disease outbreaks in grazing beef cattle herds

2015 ◽  
Vol 120 (2) ◽  
pp. 236-240 ◽  
Author(s):  
E. Elnekave ◽  
L. Zamir ◽  
F. Hamd ◽  
B. Even Tov ◽  
E. Klement
Keyword(s):  
Risk Factors ◽  
Beef Cattle ◽  
Disease Outbreaks ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Foot And Mouth ◽  
Cattle Herds

scholarly journals Modelling the impacts of ammonia emissions reductions on North American air quality

2009 ◽  
Vol 9 (18) ◽  
pp. 7183-7212 ◽  
Author(s):  
P. A. Makar ◽  
M. D. Moran ◽  
Q. Zheng ◽  
S. Cousineau ◽  
M. Sassi ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Air Quality ◽  
Beef Cattle ◽  
North American ◽  
Ammonia Emissions ◽  
Emissions Reductions ◽  
Emission Reductions ◽  
Current Form ◽  
Emissions Inventory ◽  
Regional Air Quality

Abstract. A unified regional air-quality modelling system (AURAMS) was used to investigate the effects of reductions in ammonia emissions on regional air quality, with a focus on particulate-matter formation. Three simulations of one-year duration were performed for a North American domain: (1) a base-case simulation using 2002 Canadian and US national emissions inventories augmented by a more detailed Canadian emissions inventory for agricultural ammonia; (2) a 30% North-American-wide reduction in agricultural ammonia emissions; and (3) a 50% reduction in Canadian beef-cattle ammonia emissions. The simulations show that a 30% continent-wide reduction in agricultural ammonia emissions lead to reductions in median hourly PM2.5 mass of <1 μg m−3 on an annual basis. The atmospheric response to these emission reductions displays marked seasonal variations, and on even shorter time scales, the impacts of the emissions reductions are highly episodic: 95th-percentile hourly PM2.5 mass decreases can be up to a factor of six larger than the median values. A key finding of the modelling work is the linkage between gas and aqueous chemistry and transport; reductions in ammonia emissions affect gaseous ammonia concentrations close to the emissions site, but substantial impacts on particulate matter and atmospheric deposition often occur at considerable distances downwind, with particle nitrate being the main vector of ammonia/um transport. Ammonia emissions reductions therefore have trans-boundary consequences downwind. Calculations of critical-load exceedances for sensitive ecosystems in Canada suggest that ammonia emission reductions will have a minimal impact on current ecosystem acidification within Canada, but may have a substantial impact on future ecosystem acidification. The 50% Canadian beef-cattle ammonia emissions reduction scenario was used to examine model sensitivity to uncertainties in the new Canadian agricultural ammonia emissions inventory, and the simulation results suggest that further work is needed to improve the emissions inventory for this particular sector. It should be noted that the model in its current form neglects coarse mode base cation chemistry, so the predicted effects of ammonia emissions reductions shown here should be considered upper limits.

scholarly journals Seroprevalence of Bovine Immunodeficiency Virus in Dairy and Beef Cattle Herds in Korea

1999 ◽  
Vol 61 (5) ◽  
pp. 549-551 ◽  
Author(s):  
Kyoung-Oh Cho ◽  
Sothy Meas ◽  
Nam-Yong Park ◽  
Yong-Hwan Kim ◽  
Yoon-Kyu Lim ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Bovine Immunodeficiency Virus ◽  
Immunodeficiency Virus ◽  
Cattle Herds

Long-term stochastic simulation of mountain beef cattle herds under diverse management strategies

2010 ◽  
Vol 103 (4) ◽  
pp. 210-220 ◽  
Author(s):  
D. Villalba ◽  
G. Ripoll ◽  
R. Ruiz ◽  
A. Bernués
Keyword(s):  
Beef Cattle ◽  
Stochastic Simulation ◽  
Management Strategies ◽  
Cattle Herds

scholarly journals Managing Bull Fertility in Beef Cattle Herds

EDIS ◽  
2019 ◽  
Vol 2006 (5) ◽  
Author(s):  
Gary R. Hansen
Keyword(s):  
Beef Cattle ◽  
Publication Date ◽  
Science Department ◽  
Original Publication ◽  
Animal Science ◽  
Cattle Herds

The purpose of this paper is to discuss how producers can evaluate and manage bull fertility within beef cattle herds. This document is AN153, one of a series of the Animal Science Department, UF/IFAS Extension. Original publication date February 2006.

scholarly journals Crossbreeding Systems in Beef Cattle

EDIS ◽  
2006 ◽  
Vol 2006 (17) ◽  
Author(s):  
Gary R. Hansen
Keyword(s):  
Beef Cattle ◽  
Breeding Strategy ◽  
Animal Science ◽  
Fact Sheet ◽  
Cattle Herds

AN165, a 5-page fact sheet by Gary R. Hansen, explains to beef cattle producers this breeding strategy that leads to increased performance and productivity in beef cattle herds. Published by the UF Department of Animal Science, September 2006.

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