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https://www.readbyqxmd.com/read/28644988/effect-of-marbling-on-volatile-generation-oral-breakdown-and-in-mouth-flavor-release-of-grilled-beef
#1
Damian Frank, Kornelia Kaczmarska, Janet Paterson, Udayasika Piyasiri, Robyn Warner
While the positive effect of intramuscular fat (IMF) on beef tenderness is well-established, its role in flavor generation and flavor release is less defined. To increase understanding, real-time volatile generation was monitored during grilling of beefsteaks (grass and grain-fed Angus and grass-fed Wagyu) with different amounts of IMF by proton transfer reaction mass spectrometry. Volatile concentration increased significantly (p<0.001) when the IMF was >~10%, but did not differ (p>0.05) at lower IMF levels (5...
June 15, 2017: Meat Science
https://www.readbyqxmd.com/read/28554651/fatty-acid-volatile-and-sensory-characteristics-of-beef-as-affected-by-grass-silage-or-pasture-in-the-bovine-diet
#2
Gebrehawerya B Mezgebo, Frank J Monahan, Mark McGee, Edward G O'Riordan, Ian R Richardson, Nigel P Brunton, Aidan P Moloney
Fatty acids, volatile compounds and sensory attributes of beef from bulls fed concentrates to slaughter (C), grass silage for 120days (GS) followed by C (GSC), or GS followed by 100days at pasture and then C (GSPC), and slaughtered at 3 target carcass weights, were determined. Total intramuscular fat (IMF) was lower for GSPC than for GSC and C. C18:3n-3 concentration and polyunsaturated fatty acid (PUFA) to saturated fatty acid (SFA) ratio were higher and C18:2n-6 and monounsaturated fatty acid concentrations and n-6:n-3 PUFA ratio lower for GSPC than C...
November 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28515638/fatty-acid-profiles-meat-quality-and-sensory-palatability-of-grain-fed-and-grass-fed-beef-from-hanwoo-american-and-australian-crossbred-cattle
#3
Young-Hwa Hwang, Seon-Tea Joo
Fatty acid profiles in relation to meat quality traits and sensory palatability of grain-fed and grass-fed beef from Hanwoo, American, and Australian crossbred cattle were examined in this study. There were significant (p<0.001) differences in fat content and fatty acid compositions between grain-fed and grass-fed beef. Grain-fed Hanwoo had significantly (p<0.001) lower saturated fatty acid (SFA) proportion but higher monounsaturated fatty acid (MUFA) proportion compared to grass-fed cattle. The proportion of oleic acid in grain-fed Hanwoo was significantly (p<0...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/28397330/is-meat-quality-of-forage-fed-steers-comparable-to-the-meat-quality-of-conventional-beef-from-concentrate-fed-bulls
#4
M Blanco, I Casasús, G Ripoll, P Albertí, B Panea, M Joy
BACKGROUND: Replacing concentrates with forages in the diet of finishing cattle to satisfy societal demands and for economic reasons is a target for beef farmers, but this change may affect meat acceptance. In the Mediterranean area, young bulls are usually finished on concentrates (Conventional beef). Alternatively, steers can be finished on grass with supplements (G-supp); however, if carcasses are too lean, meat quality may be negatively affected. To increase fat deposition, grazing steers were finished on a total mixed ration composed of alfalfa hay and corn (TMR)...
April 11, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28386840/effects-of-supplements-containing-different-additives-on-nutritional-and-productive-performance-of-beef-cattle-grazing-tropical-grass
#5
V V Carvalho, M F Paulino, E Detmann, M L Chizzotti, L S Martins, A G Silva, S A Lopes, F H Moura
A grazing trial was carried out to evaluate the inclusion of three feed additives in supplements (crude protein, CP 230 g/kg dry matter, DM) on the performance, voluntary intake, and digestibility of beef heifers grazing Brachiaria decumbens (CP 81 and neutral detergent fiber, NDF 615 g/kg DM). Thirty-five Nellore heifers (21 months of age and 383 ± 6.29 kg of body weight, BW) were used in a completely randomized design. The treatments were as follows: no supplement (control); supplement fed at 1 kg/animal/day without additives (S); supplement with monensin (S + M); supplement with yeast culture (S + YC); and supplement with enzyme complex (S + EC)...
April 7, 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28335096/estimation-of-methane-emissions-from-local-and-crossbreed-beef-cattle-in-dak-lak-province-of-vietnam
#6
Carlos Alberto Ramírez-Restrepo, Dung Van Tien, Ngoan Le Duc, Mario Herrero, Phung Le Dinh, Dung Dinh Van, Sen Le Thi Hoa, Cuong Vu Chi, Cesar Solano-Patiño, Amy M Lerner, Timothy D Searchinger
Objective: This study was aimed at evaluating effects of cattle breed resources and alternative mixed-feeding practices on meat productivity and emission intensities from household farming systems in Daklak Province, Vietnam. Methods: Records from Local Yellow x Red Sindhi (Bos indicus; Lai Sind) and ½ Limousin, ½ Drought Master and ½ Red Angus cattle during the growth (0 to 21 months) and fattening (22 to 25 months) periods were used to better understand variations on meat productivity and enteric methane emissions...
March 21, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28177359/effects-of-alternate-day-supplementation-at-two-levels-of-energy-on-intake-rumen-fermentation-and-digestibility-of-beef-heifers-fed-cool-season-perennial-grass-hay
#7
F Añez-Osuna, G B Penner, P G Jefferson, H A Lardner, J J McKinnon
A study was conducted to evaluate the effects of supplementing energy daily vs. on alternate days at levels that were 1.5 and 2 times the daily amount on DMI, rumen fermentation parameters, and apparent total tract digestibility of beef heifers fed grass hay. Four cannulated Hereford heifers (339 ± 11 kg) were randomly assigned over 4 periods to a 4 × 4 Latin square design. Heifers were fed a cool-season perennial grass (CSPG) hay (10% CP and 42% ADF) and supplemented with a pelleted feed formulated to provide 3...
January 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28061817/the-rumen-microbial-metaproteome-as-revealed-by-sds-page
#8
Timothy J Snelling, R John Wallace
BACKGROUND: Ruminal digestion is carried out by large numbers of bacteria, archaea, protozoa and fungi. Understanding the microbiota is important because ruminal fermentation dictates the efficiency of feed utilisation by the animal and is also responsible for major emissions of the greenhouse gas, methane. Recent metagenomic and metatranscriptomic studies have helped to elucidate many features of the composition and activity of the microbiota. The metaproteome provides complementary information to these other -omics technologies...
January 7, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/27898863/rapid-communication-expression-of-an-endogenous-retroviral-element-during-early-gestation-in-beef-heifers
#9
K J McLean, M S Crouse, M R Crosswhite, D N Black, C R Dahlen, P P Borowicz, L P Reynolds, A K Ward, B W Neville, J S Caton
Endogenous retroviral gene elements have been implicated in development and formation of the feto-maternal interface. A variant of the syncytin endogenous retroviral envelope gene family, , was recently found in ruminants. We hypothesized that mRNA would be differentially expressed in utero-placental tissues and would fluctuate during key time points of early gestation in beef heifers. Commercial Angus crossbred heifers ( = 46; ∼15 mo of age; BW = 362.3 ± 34.7kg) housed in 6-animal pens were fed daily with native grass hay and supplemented with cracked corn to gain 0...
October 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27829479/metabolic-and-reproductive-characteristics-of-replacement-beef-heifers-subjected-to-an-early-weaning-regimen-involving-high-concentrate-feeding
#10
A L Zezeski, V L McCracken, R K Poole, A Al Naib, J K Smith, M A McCann, M L Rhoads
In an effort to better understand the consequences of early weaning (EW) for replacement beef heifers, a two-phase experiment was conducted investigating the impact on metabolic function and documenting reproductive characteristics. In phase 1, Angus×Simmental heifers (n=35) were stratified by BW and sire, and randomly assigned to either a normal weaning (NW, n=18) or EW (n=17) treatment. EW heifers were weaned at 107±3 days of age and provided access to a concentrate-based ration ad libitum with limit-fed mixed grass hay...
November 10, 2016: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/27726060/short-term-dietary-concentrate-supplementation-during-estrus-synchronization-treatment-in-beef-cows-increased-igf-i-serum-concentration-but-did-not-affect-the-reproductive-response
#11
A M Rosales-Torres, Z B López-Cedillo, C G Hernández-Coronado, J V Rosete-Fernández, G D Mendoza, A Guzmán
The objective of this study was to evaluate if short-term dietary concentrate supplementation increased IGF-I serum concentration and resulted in a reproductive response during estrus synchronization treatment in non-lactating beef cows. Thirty non-lactating beef cows (Bos indicus × Bos taurus) were allocated to the same pastureland and fed native tropical grasses as a basal diet. Cows were synchronized using a 7-day CO-Synch plus controlled internal drug release (CIDR) protocol and received fixed time artificial insemination (FTAI)...
January 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/27716945/the-effects-of-animal-age-feeding-regime-and-a-dietary-beta-agonist-on-tenderness-of-three-beef-muscles
#12
Ennet Moholisa, Arno Hugo, Phillip E Strydom, Ina van Heerden
BACKGROUND: Animal age as determined by number of permanent incisors (p. i.) is used in classification of beef carcasses to describe expected meat tenderness. However, animals differing in age are reared under different production systems (pasture or feedlot). In addition to age, other factors associated with particular production systems may also influence the palatability of meat. Therefore, the effects of age combined with feeding regime and the supplementation of a beta-agonist (zilpaterol) on the tenderness of M...
September 22, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27692014/comparison-of-organoleptic-quality-and-composition-of-beef-from-suckler-bulls-from-different-production-systems
#13
G B Mezgebo, A P Moloney, E G O'Riordan, M McGee, R I Richardson, F J Monahan
Bull beef production is traditionally based on high concentrate rations fed indoors. Inclusion of grazed grass, which is generally a cheaper feed, would decrease the cost of bull beef production, but may affect beef quality. Accordingly, the organoleptic quality and composition of beef from continental-sired suckler bulls (n=126) assigned to either ad libitum concentrates to slaughter (C), grass silage (GS) ad libitum for 120 days followed by C (GSC) or GS followed by 100 days at pasture and then C (GSPC) and slaughtered at target carcass weights (CW) of 360, 410 or 460 kg was examined...
March 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/27453330/daily-shedding-dynamics-of-e-coli-o157-in-an-australian-grass-fed-beef-herd
#14
G A C Lammers, D Jordan, C S McCONNEL, J Heller
This study aimed to describe the diurnal shedding dynamics of Escherichia coli O157 in cattle managed on pasture. The purpose was to identify the value of a single measurement for predicting the shedding status on subsequent days. Over a 14-day period, 24 beef cows with known E. coli O157 shedding status were sampled twice daily or daily (21 sampling points) and E. coli O157 was enumerated from faeces. No association between shedding status of individual animals within a 7-h period was identified (odds ratio 1·5, P = 0·08)...
October 2016: Epidemiology and Infection
https://www.readbyqxmd.com/read/27285714/legume-finishing-provides-beef-with-positive-human-dietary-fatty-acid-ratios-and-consumer-preference-comparable-with-grain-finished-beef
#15
A Chail, J F Legako, L R Pitcher, T C Griggs, R E Ward, S Martini, J W MacAdam
Consumer liking, proximate composition, pH, Warner-Bratzler shear force, fatty acid composition, and volatile compounds were determined from the LM (longissimus thoracis) of cattle ( = 6 per diet) finished on conventional feedlot (USUGrain), legume, and grass forage diets. Forage diets included a condensed tannin-containing perennial legume, birdsfoot trefoil (; USUBFT), and a grass, meadow brome ( Rehmann; USUGrass). Moreover, representative retail forage (USDA Certified Organic Grass-fed [OrgGrass]) and conventional beef (USDA Choice, Grain-fed; ChGrain) were investigated ( = 6 per retail type)...
May 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27185157/integrated-metabolomic-and-transcriptome-analyses-reveal-finishing-forage-affects-metabolic-pathways-related-to-beef-quality-and-animal-welfare
#16
José A Carrillo, Yanghua He, Yaokun Li, Jianan Liu, Richard A Erdman, Tad S Sonstegard, Jiuzhou Song
Beef represents a major dietary component and source of protein in many countries. With an increasing demand for beef, the industry is currently undergoing changes towards naturally produced beef. However, the true differences between the feeding systems, especially the biochemical and nutritional aspects, are still unclear. Using transcriptome and metabolome profiles, we identified biological pathways related to the differences between grass- and grain-fed Angus steers. In the latissimus dorsi muscle, we have recognized 241 differentially expressed genes (FDR < 0...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27118482/sensory-and-flavor-chemistry-characteristics-of-australian-beef-influence-of-intramuscular-fat-feed-and-breed
#17
Damian Frank, Alex Ball, Joanne Hughes, Raju Krishnamurthy, Udayasika Piyasiri, Janet Stark, Peter Watkins, Robyn Warner
The sensory attributes and flavor chemistry of grilled beef striploins (M. longissimus lumborum, n = 42) varying widely in marbling from commercial production types typical for Southern Australia were extensively characterized. Striploins from Angus grass-fed yearlings (5.2-9.9% intramuscular fat), Angus grain-finished steers (10.2-14.9%), and Wagyu grass-fed heifers (7.8-17.5%) were evaluated. Inherent differences between samples from grass- and grain-fed Angus cattle were minimal when the intramuscular fat content was above ∼5%...
June 1, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27065279/effect-of-divergence-in-phenotypic-residual-feed-intake-on-methane-emissions-ruminal-fermentation-and-apparent-whole-tract-digestibility-of-beef-heifers-across-three-contrasting-diets
#18
R P McDonnell, K J Hart, T M Boland, A K Kelly, M McGee, D A Kenny
This study aimed to examine the effect of divergent phenotypic ranking for residual feed intake (RFI) on ruminal CH emissions, diet digestibility, and indices of ruminal fermentation in heifers across 3 commercially relevant diets. Twenty-eight Limousin × Friesian heifers were used and were ranked on the basis of phenotypic RFI: 14 low-RFI and 14 high-RFI animals. Ruminal CH emissions were estimated over 5 d using the SF tracer gas technique on 3 successive occasions: 1) at the end of a 6-wk period (Period 1) on grass silage (GS), 2) at the end of an 8-wk period (Period 2) at pasture, and 3) at the end of a 5-wk period (Period 3) on a 30:70 corn silage:concentrate total mixed ration (TMR)...
March 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/26954759/improved-sensitivity-for-determining-thiobarbituric-acid-reactive-substances-in-ground-beef
#19
C R Kerth, C W Rowe
To create expected differences in oxidation ground beef samples from grass-fed and grain-fed animals were utilized in six differing percentages with 4 different packaging types. Percentages of grass-fed and grain-fed ground beef (GB) consisted of 100% grain fed GB; 80% grain-fed: 20% grass-fed GB; 60% grain-fed: 40% grass-fed GB; 40% grain-fed: 60% grass-fed GB; 20% grain-fed: 80% grass-fed GB; and 100% grass-fed GB. Packaging treatments included: high oxygen (HO; 80% O2: 20% CO2), low oxygen (LO; 65% N2: 35% CO2), carbon monoxide (CO; 65% N2: 34...
July 2016: Meat Science
https://www.readbyqxmd.com/read/26822886/carcass-and-meat-quality-of-finished-and-non-finished-limousin-heifers-from-alpine-livestock-systems-differing-in-altitudinal-origin-of-the-forage
#20
Isabelle D M Gangnat, Michael Kreuzer, Andrea Clavijo McCormick, Florian Leiber, Joel Berard
Effects of the alpine origin of the forage and of finishing on carcass and beef quality were quantified by modelling different alpine livestock system alternatives. Thirty-five Limousin heifers, initially weighing 383 ± 45 kg, were fed fresh grass at 400 or 2000 m above sea level, or a 1:1 mixture of alpine grass and lowland grass hay at 2000 m. After 9 weeks, the six heaviest and oldest animals per group were slaughtered. The remaining animals were finished for 8 weeks on a silage-concentrate diet in the lowlands to similar age and body weight as the first slaughtered group...
2016: Archives of Animal Nutrition
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