Genetics and Genomics Commons^™

Genetic Character Of Cyb5 Gene Among Different Pig Breeds.Pdf, Ying Bai, Jibin Zhang, Meiying Fang

Jibin Zhang

Genetic Parameters For Concentrations Of Minerals In Longissimus Muscle And Their Associations With Palatability Traits In Angus Cattle, R. G. Mateescu, A. J. Garmyn, Richard G. Tait Jr., Qing Duan, Q. Liu, Mary S. Mayes, Dorian J. Garrick, A. L. Van Eenennaam, D. L. Vanoverbeke, G. G. Hilton, Donald C. Beitz, James M. Reecy

Richard G. Tait Jr.

The objective of this study was to estimate genetic parameters for concentrations of minerals in LM and to evaluate their associations with beef palatability traits. Samples of LM from 2,285 Angus cattle were obtained and fabricated into steaks for analysis of mineral concentrations and for trained sensory panel assessments. Nine minerals, including calcium, copper, iron, magnesium, manganese, phosphorus, potassium, sodium, and zinc, were quantified. Restricted maximum likelihood procedures were used to obtain estimates of variance and covariance components under a multiple-trait animal model. Estimates of heritability for mineral concentrations in LM varied from 0.01 to 0.54. Iron and sodium were …

Evaluation Of Fixed Sources Of Variation And Estimation Of Genetic Parameters For Incidence Of Bovine Respiratory Disease In Preweaned Calves And Feedlot Cattle, M. J. Schneider, Richard G. Tait Jr., Marshall V. Ruble, W. Darrell Busby, James M. Reecy

Richard G. Tait Jr.

The primary objective of this study was to estimate variance components and heritability of bovine respiratory disease (BRD) incidence in beef calves before weaning and during the finishing phase. The second objective was to investigate the impact of BRD incidence and treatment frequency on performance and carcass traits. Bovine respiratory disease is the biggest and most costly health challenge facing the cattle industry. The 2 populations used consisted of 1,519 preweaned calves and 3,277 head of feedlot cattle. The incidence rate of BRD in preweaned calves was 11.39%, and among treated cattle, 82.1% were treated once, 13.9% were treated twice, …

Genetic Parameters For Carnitine, Creatine, Creatinine, Carnosine, And Anserine Concentration In Longissimus Muscle And Their Association With Palatability Traits In Angus Cattle, R. G. Mateescu, A. J. Garmyn, M. A. O'Neil, Richard G. Tait Jr., Almass A. Abuzaid, Mary S. Mayes, Dorian J. Garrick, A. L. Van Eenennaam, D. L. Vanoverbeke, G. G. Hilton, Donald C. Beitz, James M. Reecy

Richard G. Tait Jr.

The objective of this study was to estimate genetic parameters for carnitine, creatine, creatinine, carnosine, and anserine concentration in LM and to evaluate their associations with Warner-Bratzler shear force (WBSF) and beef palatability traits. Longissimus muscle samples from 2,285 Angus cattle were obtained and fabricated into steaks for analysis of carnitine, creatine, creatinine, carnosine, anserine, and other nutrients, and for trained sensory panel and WBSF assessments. Restricted maximum likelihood procedures were used to obtain estimates of variance and covariance components under a multiple-trait animal model. Estimates of heritability for carnitine, creatine, creatinine, carnosine, and anserine concentrations in LM from Angus …

Genome-Wide Association Study Of Infectious Bovine Keratoconjunctivitis In Angus Cattle, Kadir Kizilkaya, Richard G. Tait Jr., Dorian J. Garrick, Rohan L. Fernando, James M. Reecy

Richard G. Tait Jr.

Background Infectious Bovine Keratoconjunctivitis (IBK) in beef cattle, commonly known as pinkeye, is a bacterial disease caused by Moraxella bovis. IBK is characterized by excessive tearing and ulceration of the cornea. Perforation of the cornea may also occur in severe cases. IBK is considered the most important ocular disease in cattle production, due to the decreased growth performance of infected individuals and its subsequent economic effects. IBK is an economically important, lowly heritable categorical disease trait. Mass selection of unaffected animals has not been successful at reducing disease incidence. Genome-wide studies can determine chromosomal regions associated with IBK susceptibility. The …

Comparison Of Calf-Fed Vs. Yearling-Fed Management For The Estimation Of Carcass Trait Genetic Parameters In Simmental Cattle, Richard G. Tait Jr.

Richard G. Tait Jr.

Selection indexes for feedlot performance have been developed by U.S. beef breed associations to help commercial producers with multiple trait selection decisions. The objective of this study was to evaluate the implications of backgrounding cattle after weaning on selection for feedlot profitability. Carcass data records for 11,011 animals and a three generation pedigree were obtained from the American Simmental Association database. Carcass traits of primary interest in this analysis were marbling score (MARB), 12^th rib fat thickness (CFT), 12^th rib ribeye area (CREA), and hot carcass weight (HCW). Estimated post weaning gain (EPWG) was determined using weaning weight …