Meat Science Commons^™

Evaluation Of Precision Livestock Technology And Human Scoring Of Nursery Pigs In A Controlled Immune Challenge Experiment, Eduarda M. Bortoluzzi, Mikayla J. Goering, Sara J. Ochoa, Aaron J. Holliday, Jared M. Mumm, Catherine E. Nelson, Hui Wu, Benny E. Mote, Eric T. Psota, Ty B. Schmidt, Majid Jaberi-Douraki, Lindsey E. Hulbert

Faculty Papers and Publications in Animal Science

The objectives were to determine the sensitivity, specificity, and cutoff values of a visual-based precision livestock technology (NUtrack), and determine the sensitivity and specificity of sickness score data collected with the live observation by trained human observers. At weaning, pigs (n = 192; gilts and barrows) were randomly assigned to one of twelve pens (16/pen) and treatments were randomly assigned to pens. Sham-pen pigs all received subcutaneous saline (3 mL). For LPS-pen pigs, all pigs received subcutaneous lipopolysaccharide (LPS; 300 µg/kg BW; E. coli O111:B4; in 3 mL of saline). For the last treatment, eight pigs were randomly …

Evaluating The Effect Of Accelerated Aging At Different Temperature And Time Points On Beef Quality And Enzyme Activity Of Lower Quality Beef Cuts, H. Jeneske, C. K. Chun, S. Hene, L. A. Koulicoff, H. Aufdemberge, J. L. Vipham, T. G. O'Quinn, M. D. Chao

Kansas Agricultural Experiment Station Research Reports

Objective: This study aimed to explore the effects of four accelerated aging (AA) methods at different temperature and time points on meat quality and enzymatic activity of two lower quality beef cuts.

Study Description: Shoulder clod and top round were collected from 10 U.S. Department of Agriculture choice beef carcasses, fabricated into steaks, and assigned to one of six treatments: 3 days postmortem (control), cooler aged for 21 days, AA 120°F for 2 h, AA 120°F for 3 h, AA 130°F for 2 h, and AA 130°F for 3 h. Yield was calculated based on loss during AA and cooking …

Evaluation Of Kansas Beef Consumers’ Awareness And Understanding Of Business-To-Consumer Marketing, L. K. Decker, K. R. Lybarger, J. Kwon, G. Ibendahl, Y. Teng-Vaughan, D. Kehler, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of the study was to determine the understanding and knowledge level of consumers purchasing beef in a business-to-consumer (B2C) format within Kansas.

Study Description: A digital survey was created to evaluate consumers’ familiarity and satisfaction of buying beef in a B2C format. The survey was made available for a two-week period to consumers utilizing the Shop Kansas Farms online social media group.

Results: Results of the survey showed 93% of consumers (n = 174) reported having previously purchased beef products from a local producer or locker. Of these, 63.1% reported that their most recent purchase was their …

Effects Of Adding Egg Powder From Hens Immunized Against Phospholipase Α2 On Ground Striploin Shelf Life, C. Velasco Ayala, L. A. Koulicoff, C. K. Chun, T. G. O'Quinn, E. Boyle, M. Richards, C. K. Jones, M. D. Chao

Kansas Agricultural Experiment Station Research Reports

Objective: The present study investigated the effect of incorporating three different levels of dried egg powder (EP) containing antiphospholipase α2 (aPLA2) on lipid oxidation and discoloration for its potential to extend ground striploin shelf life.

Study Description: U.S. Department of Agriculture choice striploins from ten beef carcasses were used. Impacts on beef discoloration, L* (lightness), a* (redness), and b* (yellowness) parameters, and lipid oxidation over a 7-day display period were studied. The fatty acid and phospholipid profiles of the beef patties were also examined.

Results: The EP was confirmed to contain active aPLA2. As expected, a* and b* values decreased …

Establishing Spoilage Thresholds Of Ground Beef In A Traditional Retail Case Scenario, G. E. Corrette, E. S. Beyer, E. A. Mendez, V. Hay, T. G. O'Quinn, M. D. Chao, J. L. Vipham

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to determine spoilage in fresh ground beef and the perception of consumers regarding alteration of sensory characteristics, as well as the acceptability at different days of shelf-life.

Study Description: Ground beef loaves (n = 84) of 80% lean, 20% fat composition and aerobically packaged were stored in a simulated refrigerated retail case for 6 days. Consumers evaluated visual color, odor, touch, and taste. Instrumental color, lipid oxidation, aerobic plate count, and Enterobacteriaceae count were determined.

The Bottom Line: In this study, color was shown to be the important product characteristic of spoilage to …

Consumer Sensory Evaluation Of Ground Beef And Plant-Based Ground Beef Alternatives Used In A Taco Application, L. A. Egger, K. J. Farmer, E. S. Beyer, K. R. Lybarger, J. L. Vipham, M. D. Zumbaugh, M. D. Chao, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to evaluate consumer preferences for palatability traits and consumer acceptability of three plant-based protein alternatives and ground beef in a taco application.

Study Description: Three commercially available plant-based ground beef alternative (GBA) treatments (n = 20) were selected based upon industry prevalence. The GBAs’ were identified as the most popular in the marketing sectors of foodservice (FGBA), retail (RGBA), and traditional (TGBA). One ground beef (80% lean; 20% fat) treatment (n = 20) was selected. Samples were crumbled into a skillet and cooked to a surface temperature of 180°F. Following cooking, a generic …

Change In Myoglobin Denaturation Among Three Degrees Of Doneness Of Three Muscles, E. S. Beyer, K. J. Farmer, E. G. Kidwell, S. G. Davis, K. M. Harr, K. R. Lybarger, L. A. Egger, M. D. Chao, M. D. Zumbaugh, J. L. Vipham, M. C. Hunt, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to determine the changes in myoglobin denaturation through cooking three different muscles to medium rare, medium, or well-done degrees of doneness.

Study Description: Strip loins (n = 12) and top butts (n = 12) were used to evaluate the physiochemical properties of the longissimus dorsi, biceps femoris, and gluteus medius for three degrees of doneness (DOD; medium rare, medium, and well-done).

The Bottom Line: As expected, the myoglobin denaturation percentage increased with increasing DOD and behaved similarly to changes in the a* values. This research gives more insight into the impacts of cooking …

Evaluation Of Bovine Myosin Heavy Chain Isoforms And Muscle Fiber Cross-Sectional Area On The Eating Quality Of 11 Different Beef Muscles, S. Hene, H. Ness, E. Verrill, P. A. Hammond, C. K. Chun, T. G. O'Quinn, M. D. Chao

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to investigate the contribution of muscle fiber type and size on the eating quality of 11 different beef muscles.

Study Description: Eleven different beef muscles were utilized from two separate studies. In study 1, shoulder clod, flank, knuckle, mock tender, top sirloin butt, brisket, eye of round, and ribeye were collected from 10 U.S. Department of Agriculture choice carcasses (n = 80), and each muscle was fabricated into steaks at 2 days postmortem. In study 2, strip loin, tri-tip, and heel were collected from 10 USDA low choice carcasses (n = 30). Myofibrillar …

2023 Cattlemen’S Day Full Report, Liz Boyle

Kansas Agricultural Experiment Station Research Reports

This report includes research conducted in 2022 on beef cattle management, reproduction, nutrition, and meat science conducted at Kansas State University.

Consumer Sensory Evaluation Of Ground Beef And Plant-Based Ground Beef Alternatives Used In A Hamburger Application, L. A. Egger, K. J. Farmer, E. S. Beyer, K. R. Lybarger, J. L. Vipham, M. D. Zumbaugh, M. D. Chao, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to evaluate the palatability traits and consumer acceptance of three plant-based ground beef alternatives in comparison to ground beef in a foodservice-like hamburger application.

Study Description: Three popular plant-based ground beef alternatives (GBA) and 80% lean, 20% fat composition ground beef chubs (n = 20) were selected for consumer analysis. Samples were cooked to an internal temperature of 160°F, plated on a bun and served to consumers with the opportunity to apply ketchup, mustard, cheese, lettuce, and pickles. Consumers evaluated the differences in palatability traits and purchase intent for the samples identified as: …

Consumer Sensory Evaluation Of The Impact Of Bone-In Versus Boneless Cuts On Beef Palatability, K. J. Farmer, E. S. Beyer, S. G. Davis, K. M. Harr, M. D. Chao, J. L. Vipham, M. D. Zumbaugh, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to determine palatability traits of beef cuts of differing bone status and quality grade.

Study Description: Paired (n = 12 pairs; 24 total/cut/grade) boneless and bone-in ribeye rolls, and short loins were procured. Short loins were fabricated into boneless strip loins with corresponding bone-in tenderloins or bone-in strip loins with boneless tenderloins. Post aging, subprimal cuts were fabricated into steaks that were randomly selected for further analysis. Consumer sensory panelists (n = 144) were recruited from Manhattan, KS, and the surrounding area and paid for their participation in the study. Panels were conducted …

Assessment Of Kansas Beef Producers’ Perception And Knowledge Level Of Business-To-Consumer Marketing, K. R. Lybarger, J. Kwon, G. Ibendahl, Y. Teng-Vaughan, D. Kehler, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to assess the perception and knowledge level of Kansas beef producers regarding business-to-consumer marketing.

Study Description: A digital survey was created to assess the perception and knowledge level of business-to-consumer (B2C) marketing of Kansas beef producers. The survey was disseminated to Kansas beef producers utilizing the Shop Kansas Farms online social networking group.

Results: Results from this study showed that 25.5% of beef producer respondents (n = 41) raise another species in addition to beef. It was found that 50.0% of survey respondents sold 20 or fewer head of finished beef cattle in …

Estimation Of Breeding Values Using Different Densities Of Snp To Inform Kinship In Broiler Chickens, Mayara Salvian, Gabriel Costa Monteiro Moreira, Ândrea Plotzki Reis, Brayan Dias Dauria, Fabrício Pilonetto, Izally Carvalho Gervásio, Mônica Corrêa Ledur, Luiz Lehmann Coutinho, Matthew L. Spangler, Gerson Barreto Mourao

Faculty Papers and Publications in Animal Science

Background: Traditionally, breeding values are estimated based on phenotypic and pedigree information using the numerator relationship (A) matrix. With the availability of genomic information, genome-wide markers can be included in the estimation of breeding values through genomic kinship. However, the density of genomic information used can impact the cost of implementation. The aim of this study was to compare the rank, accuracy, and bias of estimated breeding values (EBV) for organs [heart (HRT), liver (LIV), gizzard (GIZ), lungs (LUN)] and carcass [breast (BRST), drumstick (DRM) and thigh (THG)] weight traits in a broiler population using pedigree-based BLUP (PBLUP) and …

Consumer Color And Discoloration Thresholds For Purchase Of Retail Ground Beef When Evaluating Packages Of A Single Day Of Display, K. R. Lybarger, E. S. Beyer, K. J. Farmer, L. A. Egger, L. N. Drey, J. L. Vipham, M. D. Zumbaugh, M. D. Chao, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: This study utilized a simulated retail display to investigate the impact of ground beef color and discoloration on consumer purchase intent, while identifying the best objective measurements to predict consumer preferences of ground beef on the same day of retail display.

Study Description: For this study, 180 1-lb 80% lean/20% fat ground beef loaves were assigned to a specific day of retail display (day 0–9). Consumers (n = 318) and trained descriptive panelists assessed ground beef samples, with a single day of display evaluated per consumer group. Spectral data and L* (lightness), a* (redness), and b* (yellowness) …

Determination Of Consumer Color And Discoloration Thresholds For Purchase Of Retail Ground Beef When Evaluating Multiple Days Of Display Simultaneously, K. R. Lybarger, E. S. Beyer, K. J. Farmer, L. A. Egger, L. N. Drey, J. L. Vipham, M. D. Zumbaugh, M. D. Chao, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to identify the threshold for color and discoloration for consumers to purchase ground beef in a simulated retail display and to determine the best objective measurement to predict consumer purchase intent.

Study Description: For this study, 180 1-lb 80% lean/20% fat ground beef packages were assigned to a day of retail display (day 0–9). Consumers (n = 216) and trained descriptive panelists evaluated ground beef samples from each day of display simultaneously. Instrumental L* (lightness), a* (redness), and b* (yellowness) values were collected, and spectral data were recorded. Logistic and simple …

Effect Of Increasing Corn Silage Inclusion In Finishing Diets Cattle With Or Without Tylosin On Performance And Liver Abscesses, Hannah C. Wilson, Levi J. Mcphillips, Bradley M. Boyd, Andrea K. Watson, Jim C. Macdonald, Galen E. Erickson

Faculty Papers and Publications in Animal Science

A pooled analysis was performed to evaluate whether corn silage fed at 15% or 45% of diet DM impacted liver abscesses prevalence at slaughter in five previous experiments. Cattle fed 15% corn silage had 7.8% abscessed livers compared to 4.1% for cattle fed 45% corn silage when all diets contained tylosin. While improved due to increased corn silage inclusion, the objective of the current finishing study was to determine the impact of silage inclusion in finishing diets with and without tylosin on performance and incidence of abscessed livers in beef cattle. A total of 640 (BW = 334 ± 25 …

Effect Of Dietary Urea In Gestating Beef Cows: Circulating Metabolites, Morphometrics, And Mammary Secretions, Ligia D. Prezotto, Jennifer E. Thorson

Faculty Papers and Publications in Animal Science

Prolific use of supplementation strategies, including the utilization of urea, are practiced in beef cattle production systems. Unfortunately, the influence of urea supplementation on metabolics, adipose tissue mobilization, and mammary secretions is limited in beef cows. Therefore, the objectives of this experiment were to assess the influence of urea supplementation on metabolic profiles, morphometrics, and mammary secretions. Pregnant, multiparous beef cows were fed individually and assigned to treatment (n = 4/treatment) as Control or Urea Supplementation. Blood samples and body weight were collected every 28 d throughout gestation. Backfat thickness was measured via ultrasonography on days 28 and 280 of …

Epidemiological Aspects Of Equid Herpesvirus-Associated Myeloencephalopathy (Ehm) Outbreaks, Eva Klouth, Yury Zablotski, Jessica L. Petersen, Marco De Bruijin, Gittan Gröndahl, Susanne Müller, Lutz S. Goehring

Faculty Papers and Publications in Animal Science

: Equid Herpesvirus Myeloencephalopathy (EHM) is a multifactorial disease following an EHV-1 infection in Equidae. We investigated a total of 589 horses on 13 premises in Europe in search of risk factors for the development of EHM. We found that fever (p < 0.001), increasing age (p = 0.032), and female sex (p = 0.042) were risk factors for EHM in a logistic mixed model. Some breeds had a decreased risk to develop EHM compared to others (Shetland and Welsh ponies; p = 0.017; p = 0.031), and fewer EHV-1-vaccinated horses were affected by EHM compared to unvaccinated horses (p = …

Evaluation Of Growth Performance, Carcass Characteristics, And Methane And Co2 Emissions Of Growing And Finishing Cattle Raised In Extensive Or Partial-Intensive Cow-Calf Production Systems, Zachary E. Carlson, Levi J. Mcphillips, Rick R. Stowell, Galen E. Erickson, Mary E. Drewnoski, Jim C. Macdonald

Faculty Papers and Publications in Animal Science

An experiment was conducted over 2 yr to measure performance and greenhouse gas (GHG) emissions of weaned calves from two cow-calf production systems. Crossbred steers and heifers (n = 270, initial body weight (BW) = 207 kg, SD = 35) were used in a randomized complete block design, with treatments applied to the cow-calf system. Treatments were: 1) a traditional system consisting of April to June calving with smooth bromegrass pasture and grazed corn residue as forage resources (TRAD); 2) an alternative system consisting of July to September calving utilizing partial-drylot feeding, summer-planted oats, and corn residue grazing (ALT). …

The Effect Of Corn Silage Hybrid And Inclusion On Performance Of Finishing Steers And Silage Hybrid Effects On Digestibility And Performance Of Growing Steers, F. Henry Hilscher, Curt J. Bittner, Jana L. Gramkow, Melissa L. Jollyy-Breithaupt, Mitch M. Norman, Hannah C. Wilson, Andrea K. Watson, James C. Macdonald, John N. Anderson, Galen E. Erickson

Faculty Papers and Publications in Animal Science

Three experiments evaluated the effects of three corn silage hybrids, inclusion, and nutrient digestibility in growing and finishing diets. The three hybrids tested included a control (CON), a hybrid containing a brown midrib (bm3) trait (BM3), and an experimental bm3 hybrid with the soft endosperm trait (BM3-SOFT). Experiment 1 utilized 360 crossbred steers (body weight [BW] = 334; SD = 25 kg) to evaluate inclusion of silage in a finishing diet at (15% or 45% of diet dry matter [DM]) and silage hybrid (CON, BM3, or BM3-SOFT). Experiment 2 and 3 utilized 216 crossbred steers (BW = 324; SD = …

Microbial Community Structure From Southern High Plains Beef Cattle Feedyard Manure And Relationship With Nitrous Oxide Emissions, Heidi Waldrip, David Parker, Sierra Miller, Lisa M. Durso, Byeng R. Min, Daniel N. Miller, Kenneth Casey, Bryan Woodbury, Mindy J. Spiehs

Roman L. Hruska U.S. Meat Animal Research Center

Modern molecular techniques enable characterization of the microbial biome in livestock manure, from which there is particular concern over emission of greenhouse gases. This study evaluated how sampling depth, time, temperature, and artificial rainfall affected microbial community structure in feedyard manure, and relationships between the manure biome and known parameters related to nitrous oxide (N₂O) emissions. In three large incubation chambers, maintained at different temperatures that received two applications of artificial rainfall, we evaluated manure microbiome composition and abundance of N₂O-producing enzymes (nirK and nirS) using quantitative polymerase chain reaction (qPCR). These data were …

The Effects Of Administering Different Metaphylactic Antimicrobials On Growth Performance And Health Outcomes Of High-Risk, Newly Received Feedlot Steers, Carley M. Coppin, Taylor M. Smock, Cory L. Helmuth, Jeff L. Manahan, Nathan S. Long, Ashley A. Hoffman, Jeffery A. Carroll, Paul R. Broadway, Nicole C. Burdick Sanchez, James E. Wells, Samodha C. Fernando, Kristin E. Hales

Faculty Papers and Publications in Animal Science

Bovine respiratory disease (BRD) is the primary animal health concern facing feedlot producers. Many antimicrobial mitigation strategies are available, but few studies have compared feedlot performance during both the receiving and finishing periods following application of different antimicrobials used as metaphylaxis at arrival. The objective of this study was to compare antimicrobial metaphylaxis methods on clinical health and growth performance across both the receiving and finishing periods. A total of 238 multiple-sourced steers in two source blocks were used in a generalized complete block design. The four treatments included: 1) a negative control, 5 mL of sterile saline injected subcutaneously …

Evaluation Of The Effects Of Wood-Sourced Biochar As A Feedlot Pen Surface Amendment On Manure Nutrient Capture, Jessica L. Sperber, Galen E. Erickson, Andrea K. Watson

Faculty Papers and Publications in Animal Science

Feedstuffs utilized in U.S. feedlot finishing rations incorporate high concentrations of N and P, with less than 15% of fed N and P retained by the animal. The remaining N and P are excreted in the manure, where the opportunity for manure N loss via ammonia (NH3) volatilization from the feedlot pen surface is a risk to the environment and lowers the value of manure as a fertilizer. Two nutrient mass balance experiments were conducted during the winter and summer seasons to evaluate the effects of spreading unprocessed Eastern red cedar biochar onto the feedlot pen surface on manure nutrient …

Type 2 Polysaccharide Storage Myopathy In Quarter Horses Is A Novel Glycogen Storage Disease Causing Exertional Rhabdomyolysis, Stephanie J. Valberg, Zoë J. Williams, Carrie J. Finno, Abigail Schultz, Deborah Velez-Irizarry, Marisa L. Henry, Keri Gardner, Jessica Lynn Petersen

Faculty Papers and Publications in Animal Science

Background: Both type 1 (PSSM1) and type 2 polysaccharide storage myopathy (PSSM2) are characterised by aggregates of abnormal polysaccharide in skeletal muscle. Whereas the genetic basis for PSSM1 is known (R309H GYS1), the cause of PSSM2 in Quarter Horses (PSSM2-QH) is unknown and glycogen concentrations not defined.

Objectives: To characterise the histopathological and biochemical features of PSSM2-QH and determine if an associated monogenic variant exists in genes known to cause glycogenosis.

Study design: Retrospective case control.

Methods: Sixty-four PSSM2-QH, 30 PSSM1-QH and 185 control-QH were identified from a biopsy repository and clinical data, histopathology scores …

Primary Myoblasts From Intrauterine Growth-Restricted Fetal Sheep Exhibit Intrinsic Dysfunction Of Proliferation And Differentiation That Coincides With Enrichment Of Inflammatory Cytokine Signaling Pathways, Robert J. Posont, Micah S. Most, Caitlin Cadaret, Eileen Marks-Nelson, Kiristen A. Beede, Sean W. Limesand, Ty B. Schmidt, Jessica L. Petersen, Dustin T. Yates

Faculty Papers and Publications in Animal Science

Intrauterine growth restriction (IUGR) is linked to lifelong reductions in muscle mass due to intrinsic functional deficits in myoblasts, but the mechanisms underlying these deficits are not known. Our objective was to determine if the deficits were associated with changes in inflammatory and adrenergic regulation of IUGR myoblasts, as was previously observed in IUGR muscle. Primary myoblasts were isolated from IUGR fetal sheep produced by hyperthermia-induced placental insufficiency (PI-IUGR; n = 9) and their controls (n = 9) and from IUGR fetal sheep produced by maternofetal inflammation (MI-IUGR; n = 6) and their …

Vitamin And Mineral Supplementation And Rate Of Weight Gain During The First Trimester Of Gestation In Beef Heifers Alters The Fetal Liver Amino Acid, Carbohydrate, And Energy Profile At Day 83 Of Gestation, Matthew S. Crouse, Kacie L. Mccarthy, Ana Clara B. Menezes, Cierrah J. Kassetas, Friederike Baumgaertner, James D. Kirsch, Sheri Dorsam, Tammi L. Neville, Alison K. Ward, Pawel P. Borowicz, Lawrence P. Reynolds, Kevin K. Sedivec, J. Chris Forcherio, Ronald Scott, Joel S. Caton, Carl R. Dahlen

Faculty Papers and Publications in Animal Science

The objective of this study was to evaluate the effects of feeding heifers a vitamin and mineral supplement and targeting divergent rates of weight gain during early gestation on the fetal liver amino acid, carbohydrate, and energy profile at d 83 of gestation. Seventy-two crossbred Angus heifers were randomly assigned in a 2 × 2 factorial arrangement to one of four treatments comprising the main effects of vitamin and mineral supplementation (VTM or NOVTM) and feeding to achieve different rates of weight gain (low gain [LG] 0.28 kg/day vs. moderate gain [MG] 0.79 kg/day). Thirty-five gestating heifers with female fetuses …

Vitamin And Mineral Supplementation And Rate Of Gain In Beef Heifers Ii: Effects On Concentration Of Trace Minerals In Maternal Liver And Fetal Liver, Muscle, Allantoic, And Amniotic Fluids At Day 83 Of Gestation, Kacie L. Mccarthy, Ana Clara Ana, Cierrah J. Kassetas, Friederike Baumgaertner, James D. Kirsch, Sheri T. Dorsam, Tammi L. Neville, Alison K. Ward, Pawel P. Borowicz, Lawrence P. Reynolds, Kevin K. Sedivec, J. Chris Forcherio, Ronald Scott, Joel S. Caton, Carl R. Dahlen, Kacie L. Mccarthy

Faculty Papers and Publications in Animal Science

We evaluated the effects of vitamin and mineral supplementation (from pre-breeding to day 83 of gestation) and two rates of gain (from breeding to day 83 of gestation) on trace mineral concentrations in maternal and fetal liver, fetal muscle, and allantoic (ALF) and amniotic (AMF) fluids. Crossbred Angus heifers (n = 35; BW = 359.5 ± 7.1 kg) were randomly assigned to one of two vitamin and mineral supplementation treatments (VMSUP; supplemented (VTM) vs. unsupplemented (NoVTM)). The VMSUP factor was initiated 71 to 148 d before artificial insemination (AI), allowing time for the mineral status of heifers to be altered …

Yearling Bulls Have Reduced Sperm Concentration And Increased Seminal Plasma Interleukin-8 After A 28-Day Breeding Season, Alexandria P. Snider, Kacie L. Mccathy, Elane C. Wright-Johnson, Jeffrey D. Ondrak, William T. Oliver, Carl R. Dahlen, Robert A. Cushman, Matthew S. Crouse

Faculty Papers and Publications in Animal Science

We hypothesized that yearling bulls selected for a 28-d breeding season would have reduced sperm concentrations and morphology, and have increased seminal plasma concentrations of pro-inflammatory cytokine interleukin-8 (IL-8). Yearling bulls were selected based on a breeding soundness examination (BSE) at approximately 415 d of age and contained at least 750 million sperm in the ejaculate, with 12 bulls randomly selected for breeding (BREEDERS) and 12 bulls not selected for breeding (NON-BREEDERS). After a 28-d breeding period, all bulls underwent a BSE. Plasma and seminal plasma were collected at each time point for analysis. Data were analysed utilizing either the …

The Role Of Microbiota On Campylobacter Jejuni Colonization And Growth Performance In Broiler Chickens, Ayidh Almansour

Graduate Theses and Dissertations

The successful poultry production at modern era comes from the vertical integratedindustrialization, which has fundamentally changed how animals have been living for millions of years. Antimicrobial growth promoters have been used to sustain the efficient industrialized animal production, driving antimicrobial overuse and resistance. Because of the increasing pressure from consumer’s concerns and government regulations, it is urgent to develop antimicrobial free alternatives as growth promoters in poultry production, but few effective antimicrobial alternatives are currently available. Campylobacter jejuni is one of the worldwide prevalent foodborne bacterial pathogens mainly transmitted from poultry. However, few mechanisms are available on why C. jejuni …

Estimates Of Daily Oxygen Consumption, Carbon Dioxide And Methane Emissions, And Heat Production For Beef And Dairy Cattle Using Spot Gas Sampling, C. Lee, K. A. Beauchemin, J. Dijkstra, D. L. Morris, K. Nichols, Paul J. Kononoff, D. Vyas

Faculty Papers and Publications in Animal Science

A simulation study was conducted to examine accuracy of estimating daily O₂ consumption, CO₂ and CH₄ emissions, and heat production (HP) using a spot sampling technique and to determine optimal spot sampling frequency (FQ). Data were obtained from 3 experiments where daily O2 consumption, emissions of CO2 and CH4, and HP were measured using indirect calorimetry (respiration chamber or headbox system). Experiment 1 used 8 beef heifers (ad libitum feeding; gaseous exchanges measured every 30 min over 3 d in respiration chambers); Experiment 2 used 56 lactating Holstein-Friesian cows (restricted feeding; gaseous exchanges measured every 12 min …