The objective of this study was to investigate the effects bovine respiratory disease (BRD) complex on economically important production traits with use health records in combination lung lesion scores obtained at slaughter. Records from 5,976 animals were used cattle that managed Midwestern feedlots. Average daily gain for 3 different feeding periods (acclimation, on-test, and overall test) along final BW evaluated as performance measures. Hot carcass weight, LM area, subcutaneous fat...

The objective of this study was to determine the influence beef LM nutrient components on palatability traits and evaluate impact USDA quality grade palatability. Longissimus muscle samples from related Angus cattle (n = 1,737) were obtained fabricated into steaks for trained sensory panel, Warner-Bratzler shear force (WBSF), lipid oxidation measured by thiobarbituric acid reactive substances (TBARS), fatty acid, mineral composition analysis. Pearson phenotypic correlations correlation...

Abstract Background As consumers continue to request food products that have health advantages, it will be important for the livestock industry supply a product meet these demands. One such nutrient is fatty acids, which been implicated as playing role in cardiovascular disease. Therefore, objective of this study was determine extent molecular markers could account variation acid composition skeletal muscle and identify genomic regions harbor genetic variation. Results Subsets on Illumina...

Genetic marker effects and type of inheritance are estimated with poor precision when minor allele frequencies low. A stable composite population (MARC III) was subjected to marker-assisted selection for multiple years equalize specific 1) estimate effect size mode previously reported SNP on targeted beef carcass quality traits (n=254), 2) pleiotropic nontarget performance (n=542 or 254), 3) evaluate tenderness residual variance LM tenderness. Three haplotypes within μ-calpain (CAPN1), a in...

ABSTRACT The primary objective of this study was to estimate variance components and heritability bovine respiratory disease (BRD) incidence in beef calves before weaning during the finishing phase. second investigate impact BRD treatment frequency on performance carcass traits. Bovine is biggest most costly health challenge facing cattle industry. 2 populations used consisted 1,519 preweaned 3,277 head feedlot cattle. rate 11.39%, among treated cattle, 82.1% were once, 13.9% twice, 4.0% 3...

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

Abstract Heat stress hinders growth and well-being in livestock, an effect that is perhaps exacerbated by the β1 agonist ractopamine. deficits are mediated part reduced feed intake, but other mechanisms involved less understood. Our objective was to determine direct impact of heat on ractopamine-supplemented feedlot lambs. Commercial wethers were fed under (40 °C) for 30 d, controls (18 pair-fed. In a 2 × factorial, lambs also given daily gavage 0 or 60 mg Growth, metabolic, cardiovascular,...

SNPs are informative to estimate genomic breed composition (GBC) of individual animals, but selected for this purpose were not made available in the commercial bovine SNP chips prior present study. The primary objective study was select five common panels estimating GBC animals initially involving 10 cattle breeds (two dairy and eight beef breeds). performance evaluated based on admixture model linear regression model, respectively. Finally, downstream implication prediction accuracies...

Bovine respiratory disease complex (BRDC) is the most expensive in beef cattle United States costing industry at least US$1 billion annually. causes damage to lung tissue resulting persistent lesions observable slaughter. Severe harvest have been associated with decreased preharvest ADG and increased clinical BRDC feedlot. Our objective was identify SNP that are severe observed feedlot cattle. We conducted a genomewide association study (GWAS) using case-control design for fed slaughter...

The most widely used system to predict percentage of retail product from the four primal cuts beef is USDA yield grade. purpose this study was determine whether routine ultrasound measurements and additional rump could be in place carcass grade equation more accurately saleable primals. This market cattle (n = 466) consisting Angus bulls, steers, crossbred steers. Live animal measures collected within 7 d slaughter were 1) scan weight (SCANWT); 2) 12th- 13th-rib s.c. fat thickness (UFAT); 3)...

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

Genetic marker effects and interactions are estimated with poor precision when minor allele frequencies low. An Angus population was subjected to assisted selection for multiple years increase divergent haplotype 1) estimate effect size mode of inheritance previously reported SNP on targeted beef carcass quality traits; 2) nontarget performance 3) evaluate tenderness specific residual variance models compared a single model tenderness. Divergent haplotypes within µ-calpain (CAPN1),...

Summary Milk production is one of the most important characteristics dairy sheep, and identification genes affecting milk traits critical to understanding genetics improve in future generations. Three statistical techniques, namely GWAS, ridge‐regression BLUP BayesC , were used identify SNPs significant association with three (milk yield, fat yield protein yield) a crossbred sheep population. The results suggested that chromosomes 1, 3, 4, 5, 7 11 likely harbor because these had greatest...

An important economic reason for the loss of local breeds is that they tend to be less productive, and hence having market value than commercial breeds. Nevertheless, often have irreplaceable values, genetically sociologically. In breeding programs with breeds, it crucial balance selection genetic gain maintaining diversity. These two objectives are conflicting, finding optimal point trade-off has been a challenge breeders. Genomic (GS) provides revolutionary tool improvement farm animals....

Steers from research crossbreeding projects (n = 406) were serially scanned using real-time ultrasound at 35-d intervals reimplant time until slaughter. Cattle evaluated for rump fat depth, longissimus muscle area (ULMA), 12th-rib thickness (UFAT), and percentage of intramuscular (IMF) to determine the ability predict carcass composition extended periods before Additional background information on cattle, such as live weight, ADG, breed sire, dam, implant, frame score was also used. Carcass...

Abstract Infectious bovine keratoconjunctivitis (IBK), also known as pinkeye, is characterized by damage to the cornea and an economically important, lowly heritable, categorical disease trait in beef cattle. Scores of eye were collected at weaning on 858 Angus SNP genotypes for each animal obtained from BovineSNP50 Infinium-beadchips. Simultaneous associations all with IBK phenotype determined using Bayes-C that treats effects random equal variance assumed fraction ( π =0.999) having no...

Vaccination against viruses has been shown to help prevent bovine respiratory disease in cattle. However, both passively acquired maternal antibody concentration and calf age have impact the ability of immune system a respond vaccination. The objectives this study were identify evaluate environmental management factors that affect 1) viral diarrhea virus (BVDV) type 2 level, 2) decay rate BVDV 3) responses vaccinations. A 2-shot modified live vaccine was administered 1,004 Angus calves...

Infectious Bovine Keratoconjunctivitis (IBK) in beef cattle, commonly known as pinkeye, is a bacterial disease caused by Moraxellabovis. IBK characterized excessive tearing and ulceration of the cornea. Perforation cornea may also occur severe cases. considered most important ocular cattle production, due to decreased growth performance infected individuals its subsequent economic effects. an economically important, lowly heritable categorical trait. Mass selection unaffected animals has not...

The objective of this study was to enhance estimates additive, dominance, and epistatic effects marker polymorphisms on beef carcass quality traits. Myostatin (MSTN) F94L SNP the µ-calpain (CAPN1) 316 4751 haplotype have previously been associated with fat muscle traits in cattle. Multiyear selection a composite population segregating these increased minor allele (F94L L) chosen (CAPN1 CC GT) frequencies intermediate levels resulting more precise additive nonadditive genetic effects. During...

The Brangus cattle were developed to utilize the superior traits of Angus and Brahman cattle. Their genetic compositions are expected be stabilized at 3/8 5/8 Angus. Previous studies have shown more than lineage with cattle, reasons yet investigated. In this study, we revisited breed for 3,605 from three perspectives: genome-wise (GBC), per chromosomes (CBC), chromosome segments (SBC). former (GBC) depicted an overall picture “mosaic” genome attributable their ancestors, whereas latter two...

The objective of this experiment was to determine the association glucocorticoids and markers for immune status in finishing beef steers heifers with DMI, growth, efficiency. Steers ( = 127) 109) were individually fed a ration 84 d BW measured every 21 d. Blood samples collected via jugular venipuncture metabolite (glucose lactate) cortisol analysis rectal grab feces corticosterone on 83 experiment. Plasma not correlated DMI -0.08, > 0.05) or fractional (g DMI/kg BW; -0.03, but negatively...