Studies with different populations are required to properly characterize the robustness of associations polymorphisms in candidate genes economically important traits across beef cattle before this sort genetic information can be used efficiently breeding and management decisions. The objective study was evaluate association previously reported SNP bovine leptin gene carcass meat quality from a large sample crossbred cattle. Five (UASMS1, UASMS2, UASMS3, E2JW, E2FB) were genotyped on 1,111...

Limousin-cross steers (n=135; 258±26 kg) were used to compare forage vs grain feeding on carcass composition and palatability attributes of beef when time feed was controlled. Diets included a 95% alfalfa silage ration (AS) or 68% high-moisture corn, 25% (HMC). These incorporated into six treatments allow comparisons end points based similar days backfat finish. Dietary 1) HMC (4 mm), cattle allowed ad libitum intake until slaughter at 4 mm ultrasound backfat; 2) AS (HMC-4), slaughter,...

Calpastatin (CAST) is a naturally occurring protein that inhibits the normal tenderization of meat as it ages postmortem. A SNP was identified in CAST gene (a G to C substitution) and genotyped on crossbred commercially fed heifers (n = 163), steers 226), bulls 61) from beef feedlots, 178) University Guelph feeding trial. The association with carcass quality traits studied. Carcass included fat, lean, bone yield; grade fat; LM area; HCW. Meat marbling grade; i.m. fat content LM; tenderness...

Crossbred steers (n = 136) were used to assess breed differences in growth performance, carcass characteristics, fatty acid composition (total lipids and phospholipids), palatability attributes of longissimus muscle. A multiple regression model was applied crossbreeding data estimate genetic between Simmental Red Angus at the same level backfat finish (10 mm). spent 71 more (P < 0.001) days on feed acquire degree thickness as Angus, had heavier slaughter weights, larger 0.002) muscle area,...

Ninety-three crossbred steer calves (BW+/-SD=385+/-50 kg) were used (n=48 steers in yr 1, n=45 2) to examine the relationship among carcass traits, lean, bone, and fat proportions, visceral tissue weights, pancreatic digestive enzyme activity with DMI, ADG, G:F, residual feed intake. Calves progeny from dams predominantly of Angus Simmental breeding sired by Angus, Simmental, (predominantly breeding), Charolais, or Piedmontese bulls. Steers fed a high-moisture corn-based diet for an average...

Five beef cattle management regimens were evaluated for their effect on meat quality, fatty acid composition, and overall palatability of the longis-simus dorsi (LD) muscle in Angus cross steers. A 98-d growing phase was conducted using grass silage with or without supplementation growth promotants (Revalor G Rumensin) soybean meal. Dietary treatments finishing developed based exclusive feeding forages no grain supplementation, grain:forage (70:30) diets. Growth increased (P < 0.01) shear...

This study was conducted to: (1) identify new SNPs for residual feed intake (RFI) and performance traits within candidate genes identified in a genome wide association (GWAS); (2) estimate the proportion of variation RFI explained by detected SNPs; (3) effects on carcass to avoid undesirable correlated these economically important when selecting efficiency; (4) map biological mechanisms pathways. A total number 339 corresponding 180 were tested with phenotypes using single locus regression...

To meet the growing consumer demand for chicken meat, poultry industry has selected broiler chickens increasing efficiency and breast yield. While this high productivity means affordable consistent product, it come at a cost to welfare. There been advocacy pressure on primary breeders, producers, processors, retailers improve welfare of billions processed annually. Several small-scale studies have reported better outcomes slower-growing strains compared fast-growing, conventional strains....

Selection for accelerated growth rate and high breast yield in broiler chickens have been associated with an increase myopathies, including wooden (WB) white striping (WS). To investigate effects of on carcass traits incidence 14 strains were evaluated, encompassing 2 conventional (CONV; B C: ADG0-48 > 60 g/d) 12 slower-growing (SL) strains. The latter categorized based rate: FAST (strains F, G, I M; ADG0-62=53–55 g/d), MOD E, H, O S; ADG0-62=50-51 SLOW D, J, K N; ADG0-62<50 g/d). In a...

We investigated the effects of fish meal (FM) in beef cattle diets on growth performance, carcass characteristics, and fatty acid (FA) composition longissimus muscle 63 yearling steers (335 +/- 23 kg). High-moisture corn alfalfa silage were supplemented with either a gluten/blood mixture or FM at 10% diet. Fish contained (as-is basis) 5.87 g/kg eicosapentaenoic (EPA) 9.84 docosahexaenoic (DHA). Seven strategies developed to feed control diet (no FM) containing 5 fed for 56, 112, 168 d before...

Forty Angus-cross steers were used to evaluate 5 beef cattle management regimens for their effect on growth performance, carcass characteristics, and cost of production. A 98-d growing phase was incorporated using grass silage with or without promotants (trenbolone acetate + estradiol implants, monensin in the feed) soybean meal. Dietary treatments finishing developed, addition same promotants, based exclusive feeding forages minimal supplementation barley-based diets. Overall, ADG animals...

Genetic improvement of beef quality will benefit both producers and consumers, can be achieved by selecting animals that carry desired quantitative trait nucleotides (QTN), which result from intensive searches using genetic markers. This paper presents a genome-wide association approach utilizing single nucleotide polymorphisms (SNP) in the Illumina BovineSNP50 BeadChip to seek genomic regions potentially harbor genes or QTN underlying variation carcass cattle. study used 747 genotyped...

Allelopathic effects may be a contributing factor in the mixed success of legume re-establishment Kentucky bluegrass ( Poa pratensis L.)-dominated pastures. Under controlled conditions, we evaluated whether aqueous shoot or root extracts from would affect seed germination for three alfalfa Medicago sativa L.) cultivars after 7-day incubation period. Both and had an inhibitory effect on all cultivars. AAC Trueman was least affected AC Caribou most by extracts, suggesting that capacity...

TThis is a benchmark study to investigate slaughter cattle transportation conditions in Canada. Data collected included: season; temperature variation; truck ventilation; transport conditions; length of time transit; trucker training and experience hauling cattle; number lots whether were separated; sex sexes separated on mixed loads; unloading gait score; handling weight dark cutters. Information was approximately 50 000 animals transported by 1363 trucks. The prevalence cutters (mean = 2%...

One hundred and eight Charolais cross steers were used to compare forage versus grain feeding as affected by slaughter endpoint on carcass composition palatability attributes of beef. Diets included a 97% alfalfa silage ration or 68% high moisture corn, 25% from start test finish day 42 the trial followed corn until slaughter. Cattle slaughtered at either 4, 7, 10 mm ultrasound backfat. Grain increased (P = 0.01) average daily gain decreased days finish, while weight grade fat similar &gt;...

Pre-slaughter ultrasound and whole side dissection data from 47 crossbred bulls were used to assess (1) the relative value of six previously published equations based on live animal measurements, (2) alternative pre-slaughter (3) probes as predictors lean meat yield. Analysis absolute bias-corrected residuals indicated that all predicted yield with similar accuracy (P = 0.62), but analysis rank an equation originally carcass measurements tended 0.17) less precisely than five ultrasound-based...

Vitamins influence collagen metabolism in animals grown for meat. This study investigated whether vitamins E and C regulate turnover muscle by the balance of effects on synthesis its degradation secretion matrix metalloproteinases (MMPs) bovine intramuscular fibroblasts. Fibroblasts isolated from longissimus dorsi (LD) semitendinosus (ST) were treated with different concentrations vitamins. Pro-MMP-2, MMP-2, total soluble (TSC) determined. each preferentially increased (P < 0.05) MMP-2 cells...

Ten 394-kg, ruminally fistulated Hereford steers were used in a replicated 5×5 Latin square design to evaluate the effects of source and level dietary NDF on chewing activities during eating rumination. Diets contained 62 64% TDN included 1) 80% pelleted concentrate (control; ground grains, fibrous byproducts, molasses, protein, vitamin, mineral supplements; 36% NDF, 16% CP) 20% long timothy hay (67% 8% CP), 2) control alfalfa cubes (56% 15% 3) 90% 10% cubes, 4) completely diet using corn...

Partial carcass dissection data from 1,031 finished crossbred beef steers were used to calculate heritabilities and genetic correlations among subcutaneous, intermuscular, body cavity fat percentage marbling score adjusted slaughter age-, HCW-, depth-, score-constant endpoints. Genetic also calculated these partitions with live growth ultrasound traits evaluated in yearling bulls (n = 2,172) steer measurements. Heritabilities of the different ranged 0.22 (marbling fat) 0.46 (HCW-constant...