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Grass fed beef

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https://www.readbyqxmd.com/read/27898863/rapid-communication-expression-of-an-endogenous-retroviral-element-during-early-gestation-in-beef-heifers
#1
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
#2
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
#3
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)...
October 10, 2016: 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
#4
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
#5
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...
October 3, 2016: 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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/26641192/influence-of-late-gestation-drylot-rations-differing-in-protein-degradability-and-fat-content-on-beef-cow-and-subsequent-calf-performance
#13
T B Wilson, D B Faulkner, D W Shike
Spring-calving, mature cows ( = 191 total) and their progeny were used to evaluate the effects of late gestation drylot rations differing in RUP and fat content on cow performance as well as performance and carcass characteristics of subsequent progeny. Cows were blocked by BW and anticipated calving date and assigned to 16 pens. Pens were randomly allotted to 1 of 2 treatments: limit-fed corn coproducts and ground cornstalks (COP; TDN = 64.4%, CP = 11.1%, RDP = 60.2% of CP, and fat = 5.1%) or limit-fed ground mixed, cool-season grass hay (HY; TDN = 55...
December 2015: Journal of Animal Science
https://www.readbyqxmd.com/read/26613658/the-effects-on-cow-performance-and-calf-birth-and-weaning-weight-of-replacing-grass-silage-with-brewers-grains-in-a-barley-straw-diet-offered-to-pregnant-beef-cows-of-two-different-breeds
#14
J A Rooke, C-A Duthie, J J Hyslop, C A Morgan, T Waterhouse
The effects on cow and calf performance of replacing grass silage with brewers grains in diets based on barley straw and fed to pregnant beef cows are reported. Using a 2 × 2 factorial arrangement of breed and diet, cows pregnant by artificial insemination (n = 34) of two breeds (cross-bred Limousin, n = 19 and pure-bred Luing, n = 15) were fed diets ad libitum which consisted of either (g/kg dry matter) barley straw (664) and grass silage (325; GS) or barley straw (783) and brewers grains (206, BG) and offered as total mixed rations...
August 2016: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/26197431/correction-ruminal-transcriptomic-analysis-of-grass-fed-and-grain-fed-angus-beef-cattle
#15
Yaokun Li, José A Carrillo, Yi Ding, YangHua He, Chunping Zhao, Linsen Zan, Jiuzhou Song
No abstract text is available yet for this article.
2015: PloS One
https://www.readbyqxmd.com/read/26145179/methane-emissions-from-two-breeds-of-beef-cows-offered-diets-containing-barley-straw-with-either-grass-silage-or-brewers-grains
#16
COMPARATIVE STUDY
C-A Duthie, J A Rooke, J J Hyslop, A Waterhouse
Increasing the concentration of dietary lipid is a promising strategy for reducing methane (CH4) emissions from ruminants. This study investigated the effect of replacing grass silage with brewers' grains on CH4 emissions of pregnant, non-lactating beef cows of two breeds. The experiment was a two×two factorial design comprising two breeds (LIMx, crossbred Limousin; and LUI, purebred Luing) and two diets consisting of (g/kg diet dry matter (DM)) barley straw (687) and grass silage (301, GS), or barley straw (763) and brewers' grains (226, BG), which were offered ad libitum...
October 2015: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/26097290/dietary-sources-current-intakes-and-nutritional-role-of-omega-3-docosapentaenoic-acid
#17
Oleksandr A Byelashov, Andrew J Sinclair, Gunveen Kaur
Fish oils and long-chain omega-3 fatty acids are well recognized for their critical role in human diets. Docosapentaenoic acid (DPA, 22 : 5n-3) has always been a part of healthy nutrition, since infants obtain almost as much DPA as DHA from human milk. Fish oil supplements and ingredients, oily fish, and grass-fed beef can serve as the primary DPA sources for the general population. Although the DPA levels in fish oils are substantially lower than those of EPA and DHA, concentrated DPA products are now becoming commercially available, and DPA-based drugs are under development...
April 2015: Lipid Technology
https://www.readbyqxmd.com/read/26090810/ruminal-transcriptomic-analysis-of-grass-fed-and-grain-fed-angus-beef-cattle
#18
Yaokun Li, José A Carrillo, Yi Ding, YangHua He, Chunping Zhao, Linsen Zan, Jiuzhou Song
Beef represents a major diet component and one of the major sources of protein in human. The beef industry in the United States is currently undergoing changes and is facing increased demands especially for natural grass-fed beef. The grass-fed beef obtained their nutrients directly from pastures, which contained limited assimilable energy but abundant amount of fiber. On the contrary, the grain-fed steers received a grain-based regime that served as an efficient source of high-digestible energy. Lately, ruminant animals have been accused to be a substantial contributor for the green house effect...
2015: PloS One
https://www.readbyqxmd.com/read/26055891/survey-of-smallholder-beef-cattle-production-systems-in-different-agro-ecological-zones-of-cambodia
#19
Pok Samkol, Keo Sath, Mikaela Patel, Peter Andrew Windsor, Kjell Holtenius
A survey was conducted to better understand the contribution of farm productivity to rural household income and identify differences in production systems, feeding practices and development constraints to smallholder beef cattle producers in the four agro-ecological zones (AEZs) of Cambodia. A semi-structured questionnaire was used to interview 360 households in the four AEZs: I, the Great Lake Floodplain; II, the Mekong Floodplain; III, the Coastal and IV, the Plateau/Mountainous. In addition, samples of common nutritional resources used for cattle feed were collected for nutrient composition analysis, plus cattle were scored for body condition...
October 2015: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/26032584/escherichia-coli-o157-h7-discerning-facts-from-fiction-an-integrated-research-and-extension-project-for-multiple-audiences
#20
D A Moore, D R Smith, W M Sischo, K Heaton, T E Besser
The O157:H7 (EcO157) epidemiology of Shiga-toxin-producing Escherichia coli (STEC) in cattle is complex, and myths about pre-harvest control are perpetuated. The objectives of this project were to identify perpetuated misinformation and inform four audiences about evidence-based risks and pre-harvest control of EcO157 by addressing: (i) EcO157 epidemiology and pre-harvest control; (ii) how food safety policy is created; and (iii) how to present accurate information about EcO157. An environmental scan using a daily Internet search helped identify themes for education...
February 2016: Zoonoses and Public Health
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