Meat Science Commons^™

Comparison Of Tai At Gnrh Injection And Delayed Insemination Of Non- Estrus Beef Heifers, Hazy R. Nielson, Dan J. Kelly, T. L. Meyer, Rick N. Funston

Nebraska Beef Cattle Reports

Heifers were estrus synchronized utilizing the melengestrol acetate (MGA)- prostaglandin (PG) protocol. Heifers expressing estrus aft er synchronization were removed from the herd and AI. Heifers not expressing estrus were administered GnRH and either AI at GnRH injection or AI 19 hours following GnRH injection. Heifers AI from estrus detection had a higher pregnancy rate compared with heifers not expressing estrus. Pregnancy rates to AI did not diff er between heifers AI immediately aft er GnRH compared to heifers AI 19 hours aft er the GnRH injection. Th ere was no benefit to delayed AI of non-estrus beef heifers compared …

Student Perceptions And Knowledge Of The Feedlot Industry And The Feedyard Management Specialization Internship, Rachel A. Oglesbee, Meredith L. Bremer, Kari L. Lewis Lewis, Dennis R. Brink, Terry J. Klopfenstein, Jim C. Macdonald, Galen E. Erickson

Nebraska Beef Cattle Reports

A survey was developed for seniors in the undergraduate feedlot management class (ASCI 457) at UNL to gauge interest in feedlot management as a profession and familiarity with the Feedyard Management Internship Program. Th e survey found that students feel the internship is beneficial for a future in production agriculture. Th e internship increases confidence of employment and management skills once participation is complete along with gaining experience. Th e number of positions available and the average salary of feedlot managers are underestimated by students. Recruiting efforts appear to be informing students of the program.

Evaluation Of Distillers Grains Components Singly Or In Combination In A Calf Fed Feedlot Study, Rachel A. Oglesbee, Curtis J. Bittner, F. Henry Hilscher, Galen E. Erickson, Jim C. Macdonald, Matt K. Luebbe

Nebraska Beef Cattle Reports

A finishing study was conducted to determine the value of the fiber, protein, fat, and solubles components from wet distillers grains plus solubles (WDGS) alone or in combination for feedlot cattle in comparison to WDGS diets. The fiber portion alone did not improve F:G. When protein was included in the composite with fiber, F:G improved. With fat and solubles both added separately, F:G continued to improve. None of the components alone could make up the feeding value of WDGS, however the composite diet of fiber, protein, fat, and solubles combined matched the performance observed when WDGS is fed.

Rumen Protected Amino Acids In Finishing Cattle Diets, Colton Oney, Curtis J. Bittner, F. Henry Hilscher Hilscher, Andrea K. Watson, Terry J. Klopfenstein, Galen E. Erickson, Whitney Rounds

Nebraska Beef Cattle Reports

A 190- d calf fed finishing study, utilizing 240 steers, was conducted to determine the effects of supplementing finishing cattle with bypass amino acids (methionine and lysine) on growth performance. Three treatments (control, methionine, methionine and lysine) were evaluated with 8 pens/trt. All cattle were fed a 40% Sweet Bran, 50% high moisture corn basal diet. Supplementing with bypass amino acids did not affect live cattle performance, and only small differences in 12th rib fat and USDA marbling score were observed. Lack of any dramatic changes in performance suggests these calves were not deficient in methionine or lysine.

Use Of Dietary Nitrate Or Sulfate For Mitigation Of Methane Production By Finishing Steers, Anna C. Pesta, Robert G. Bondurant, Samodha C. Fernando Fernando, Galen E. Erickson

Nebraska Beef Cattle Reports

A finishing study was conducted to evaluate the effects of dietary nitrate and sulfate on methane production in finishing cattle. Both nitrate and sulfate addition decreased DMI and ADG. In diets with no sulfate, addition of nitrate had no impact on emissions, but nitrate and sulfate in combination decreased CH4:CO2. However, neither nitrate nor sulfate had any further impact on methane production. Effect of these compounds may be diet dependent and in this study had little impact on CH4 emissions in finishing cattle.

Methane Production, Diet Digestibility, And Vfa Profile Of Growing Steers Fed High Or Low Quality Forage, A. C. Pesta, M. L. Jolly- Breithaupt, Samodha C. Fernando Fernando, Paul J. Kononoff, Galen E. Erickson

Nebraska Beef Cattle Reports

A headbox calorimeter study evaluated the impacts of forage quality on methane production, diet digestibility, and VFA profile of growing steers. Daily production of methane and carbon dioxide were greater for steers fed high- quality compared to low- quality forages. Th ere was no difference in DM or OM digestibility, likely due to dramatic intake differences, and no difference in the amount of methane produced per unit of OM digested. Methane emissions data from this study agree reasonably well with those obtained by alternate methods previously utilized by this group.

Impact Of A Newly Developed Direct- Fed Microbial On Performance In Finishing Beef Steers, Laura F. Prados, Nirosh D. Aluthge, Robert G. Bondurant Bondurant, Samodha C. Fernando, Galen E. Erickson

Nebraska Beef Cattle Reports

An individual feeding experiment (n = 60) was conducted to evaluate the effects of feeding a direct- fed microbial (DFM) or not on performance of finishing steers fed 0 or 40% modified distillers grains (MDGS) in a 2 × 2 factorial design. Gain and F:G were improved when cattle were fed MDGS compared to the corn diet. No significant differences (P ≥ 0.23) were observed between cattle fed DFM or not for DMI and ADG. However, numeric advantages were observed for F:G when cattle were fed a DFM, with a 5% improvement in feed efficiency for steers supplemented with DFM.

Impact Of Inoculating Corn Silage With Buchnerii 500 On Feedlot Cattle Performance With Or Without Added Yeast Product At Time Of Feeding, Cassandra A. Row, Curtis J. Bittner, Jana L. Harding Harding, James C. Macdonald, Terry J. Klopfenstein, Angel A. Aguilar, Renato J. Schmidt, Galen E. Erickson

Nebraska Beef Cattle Reports

Inoculant, Biotal® Buchneri 500, was used to evaluate effects of silage inoculant on feedlot cattle performance and the inclusion of a yeast product, Levucell- SC. Silage was fed at 15 or 40% inclusion so overall treatment structure was a 2 × 2 × 2 factorial arrangement of treatments. Numerous 3- way interactions were observed, but appear due to inconsistent patterns of treatment eff ects. Feeding silage at 40% increased DMI, decreased ADG, and increased F:G compared to feeding 15% silage. Inoculant or feeding Levucell- SC did not improve performance.

Effect Of Corn Plant Maturity On Yield And Nutrient Quality Of Corn Plants, 2- Year Summary, Cassandra A. Row, Robert G. Bondurant, Andrea K. Watson Watson, Jana Harding, Jim C. Macdonald, Terry J. Klopfenstein, Galen E. Erickson

Nebraska Beef Cattle Reports

Corn plots were serially harvested over 2 years to evaluate changes in nutrient content, digestibility, and yield as plants matured from half- milk line through black layer. In yr 1 (2013), short (102 d) and normal (111 d) season hybrids were grown. Year 2 used 111 d and 112 d hybrids. Silage and grain yield increased until black layer. Silage DM increased with maturity to 42% at black layer. Percent NDF in the stover, NDF- digestibility and overall silage TDN increased quadratically as maturity increased. Th ere is a balance between moisture content, nutrient content, and silage yield, as corn …

Cows With Excess Androgen Are Anovulatory And Have Differing Patterns Of Progesterone Secretion, Renata Spuri- Gomes, Sarah C. Tenley, Mohamed A. Abedal- Majed Majed, Scott G. Kurz, Jeff Bergman, Jennifer R. Wood, Andrea S. Cupp

Nebraska Beef Cattle Reports

Within the physiology herd, a group of cows that have excess androgen (androstenedione, A4) in the dominant follicle and a 17% reduction in calving rate have being identified. Thus, our objective was to determine follicular dynamics (follicle growth) and progesterone (P4) concentrations in High A4 cows to determine if they were anovulatory. High A4 cows had more persistent dominant follicles and either did not display estrus and ovulated at an inappropriate time or did not ovulate compared with Low A4 cows (Controls). Furthermore, P4 concentrations had reduced peak values and were maintained longer in High vs Low A4 cows which …

Statistics Used In The Nebraska Beef Report And Their Purpose

Nebraska Beef Cattle Reports

Th e purpose of beef cattle and beef product research at University of Nebraska– Lincoln is to provide reference information that represents the various populations (cows, calves, heifers, feeders, carcasses, retail products, etc.) of beef production. Obviously, the researcher cannot apply treatments to every member of a population; therefore, he/she must sample the population. Th e use of statistics allows the researcher and readers of the Nebraska Beef Report the opportunity to evaluate separation of random (chance) occurrences and real biological effects of a treatment. Following is a brief description of the major statistics used in the beef report. For …

Effects Of Supplementing Omnigen- Af® With Or Without Ractopamine Hydrochloride On Performance And Carcass Characteristics Of Feedlot Steers, Kelby M. Sudbeck, Robert G. Bondurant, Troy J. Wistuba Wistuba, Kevin C. Dehaan, James C. Macdonald, Galen E. Erickson, Matt K. Luebbe

Nebraska Beef Cattle Reports

An experiment was used to evaluate feeding OmniGen- AF during the last 28 or 56 days of the finishing phase in diets with or without Optafl exx. Th ere were no differences in steer performance or carcass characteristics when OmniGen- AF was fed alone or in combination with Optaflexx. Feeding Optaflexx increased ADG, HCW, and improved F:G. Supplementation of Optafl exx also increased the rate of accretion in LM area, but decreased the accretion of intramuscular fat percentage. These data illustrate the repartitioning of nutrients between lean and fat tissues when Optaflexx is fed.

Effect Of Corn Residue Harvest Method On In Vivo And In Vitro Digestibility, Janessa J. Updike, Levi J. Mcphillips, Melissa L. Jolly- Breithaupt Breithaupt, Jana L. Harding, Terry J. Klopfenstein, Jim C. Macdonald

Nebraska Beef Cattle Reports

A digestion study was conducted using 18 crossbred wether lambs to evaluate the effects of corn residue harvesting method and ensiling on the digestibility of corn residue. Husks had the greatest digestibility compared to any of the harvesting methods. No differences were observed for the digestibility of husklage, ensiled husklage, or stalklage. None of the harvest methods resulted in residue digestibilities similar to husks.

Effects Of Wintering System On Cow And Calf Performance In A Summer-Calving Intensive Production System, Jason M. Warner, Curtis J. Bittner, Robert G. Bondurant Bondurant, Karla H. Jenkins, Richard J. Rasby, Matt K. Luebbe, Galen E. Erickson, Terry J. Klopfenstein

Nebraska Beef Cattle Reports

Effects of wintering cow- calf pairs on cornstalks or in a drylot on cow- calf performance and reproduction in a summer-calving intensively managed cowherd were evaluated at two locations. Cow body condition score change was not different between treatments in western Nebraska, but was greater for pairs fed in a drylot in eastern Nebraska. In western Nebraska, calf gain and weights were not different between treatments, but were greater for drylot calves in eastern Nebraska. Initial data indicate that wintering pairs on cornstalks may decrease cow performance and calf gain. If reproduction is adequate and grazing is not impeded, wintering …

Evaluation Of Varying Corn Grain (And Byproduct) Inclusion In Beef Cattle Finishing Diets, Andrea K. Watson, Matt K. Luebbe, Galen E. Erickson Erickson

Nebraska Beef Cattle Reports

A pooled- analysis of UNL feedlot trials examined the impact of starch (corn grain) on cattle performance. Cattle age (calf- fed or yearling) affected DMI, ADG, and F:G, but not marbling score or fat depth. Intake, ADG, F:G, and fat depth were optimized with 50– 70% corn grain in the diet. Marbling was not maximized until the diet contained > 75% corn. Removing either all the corn or all the byproduct from diets did not maximize performance. Including a minimum of 20% byproduct and 20% corn in the diet is biologically advantageous, while the remaining 60% of the diet is flexible …

Performance And Economics Of Supplementing Yearlings On Smooth Bromegrass Pastures, Cody A. Welchons, Robert G. Bondurant, Terry J. Klopfenstein Klopfenstein, Jim C. Macdonald, Andrea K. Watson

Nebraska Beef Cattle Reports

Ten years of performance data from 2005– 2014 were summarized to evaluate the effects of distillers grains plus solubles supplementation or fertilization of smooth bromegrass on performance and economic profitability of yearling steers with corn priced at either $3,4, or 5/bu and DGS priced at either 95, 105, or 115% the price of corn. Steers supplemented with distillers grains on non- fertilized smooth bromegrass had greater ADG (2.37 lb/d) compared with unsupplemented steers (1.69 lb/d). Unsupplemented steers grazing fertilized and nonfertilized pasture had similar gains; however, steers grazing fertilized pasture were more profitable due to savings in land rent. Supplemented …

Effect Of Pelleted Byproducts On Performance When Fed To Growing Cattle, Cody A. Welchons, Curtis J. Bittner, Dirk Burken Burken, Jim C. Macdonald, Galen E. Erickson

Nebraska Beef Cattle Reports

Heifers fed a basal diet of either low or high quality forage were supplemented with a corn residue and corn by- product pellet at 0, 0.5, or 1.0% of BW. A linear increase in final BW, ADG, and feed efficiency was observed as supplement increased for heifers fed high quality forage while a quadratic response was observed for those fed low quality forage. Increasing supplement linearly decreased daily average forage dry matter intake from 16.5 lb to 12.6 lb at 0 and 1.0% of BW, respectively. Accordingly, as supplement intake increased, total dry matter intake increased linearly from 16.5 lb …

Table Of Contents 2016 Nebraska Beef Cattle Report

Nebraska Beef Cattle Reports

No abstract provided.

2016 Nebraska Beef Cattle Report (Complete)

Nebraska Beef Cattle Reports

Contents

Cow/Calf: Effects of Wintering System on Cow and Calf Performance in a Summer-Calving Intensive Production System ● How Many Clean-up Bulls Are Needed after Estrus Synchronization and Artificial Insemination? ● Economics of Rebreeding Non-pregnant Females ● Effect of MGA vs CIDR Estrus Synchronization on Estrus Response and Pregnancy Rates in 311 d Old Beef Heifers ● Comparison of TAI at GnRH Injection and Delayed Insemination of Non-estrus Beef Heifers ● Effect of Dam Age on Offspring Productivity ● Cows with Excess Androgen are Anovulatory and Have Differing Patterns of Progesterone Secretion ● Granulosa Cell Exposure to Excess Androgens Inhibits …

Dna Barcoding Reveals Mislabeling Of Game Meat Species On The U.S. Commercial Market, Charles Quinto, Rebecca Tinoco, Rosalee S. Hellberg

Food Science Faculty Articles and Research

Game meats represent a valuable specialty market in the United States that has high economic incentives associated with mislabeling. However, there is limited information on this topic. The purpose of this study was to conduct a market survey of game meats sold within the United States and identify instances of mislabeling using DNA barcoding. Products were also examined for the presence of threatened or endangered species. Fifty-four samples of whole-cut game meats were collected from online distributors in the United States and sequenced across a 658 base-pair region of the cytochrome c oxidase subunit I (COI) gene. The resulting DNA …