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Veterinary Preventive Medicine, Epidemiology, and Public Health Commons™
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Articles 31 - 60 of 371
Full-Text Articles in Veterinary Preventive Medicine, Epidemiology, and Public Health
Evaluation Of Condensed Algal Residue Solubles As An Ingredient In Cattle Finishing Diets, John C. Gibbons, Bradley M. Boyd, Levi Mcphillips, Andrea K. Watson, Galen E. Erickson
Evaluation Of Condensed Algal Residue Solubles As An Ingredient In Cattle Finishing Diets, John C. Gibbons, Bradley M. Boyd, Levi Mcphillips, Andrea K. Watson, Galen E. Erickson
Nebraska Beef Cattle Reports
A study was conducted to evaluate feeding 0, 2.5, or 5.0% of a novel liquid feed, Condensed Algal Residue Solubles (CARS), in one of two base diets with CARS replacing corn. ! e two base diets were fed to mimic Northern Great Plains (high moisture and dry rolled corn blend fed with wet distillers grains plus solubles) and Southern Great Plains (steam- flaked corn and dry distillers grains plus solubles) feedlot diets. ! ere were no interactions between base diet and CARS inclusion. Feed intake and longissimus muscle area decreased as CARS inclusion increased in the diet. A quadratic effect …
Training Improves The Reliability Of Temperament Assessment In Cattle, Jamie T. Parham, Jessica J. Schmidt, Ronald M. Lewis
Training Improves The Reliability Of Temperament Assessment In Cattle, Jamie T. Parham, Jessica J. Schmidt, Ronald M. Lewis
Nebraska Beef Cattle Reports
Accurate and precise measurement of docility in cattle is paramount when including temperament as a criterion for selection. The value of training individuals in assigning a docility score was evaluated by comparing the reliability of individual assessments of temperament in beef cattle before and after various instructional methods. Preceding training, participants’ assessment of cattle behavior, videoed while each heifer was restrained in a chute, was not impacted by age, gender, or pre- existing cattle handling experience. Groups of participants that received additional training were more accurate and precise in evaluating temperament, regardless of training method, compared to those without. No …
An Assessment Of The Carrier State And A Novel Marker Of Leptospira And Abortion In Central Kentucky Horses, Gloria Louise Gellin
An Assessment Of The Carrier State And A Novel Marker Of Leptospira And Abortion In Central Kentucky Horses, Gloria Louise Gellin
Theses and Dissertations--Veterinary Science
Leptospirosis is a reemerging zoonotic infection of worldwide importance and affects all mammals. The bacterium is transmitted to animals and humans by urine, fetal membranes and body fluids. Leptospira shedding in the urine contaminates both soil and water, exposing both humans and animals to the bacterium. Leptospirosis in horses can cause abortion and is one of the etiologies of equine recurrent uveitis which can lead to blindness. Equine leptospiral abortion in Central Kentucky is primarily caused by serovar Pomona, with occasional cases attributed to serovar Grippotyphosa. There are a few reports in the literature attributing abortion to serovar Bratislava in …
Predicting Tomorrow: Optimizing The Early Detection Of Disease And Disease Recovery In Dairy Calves Using Precision Technologies, Melissa Cantor
Predicting Tomorrow: Optimizing The Early Detection Of Disease And Disease Recovery In Dairy Calves Using Precision Technologies, Melissa Cantor
Theses and Dissertations--Animal and Food Sciences
The leading causes of morbidity and mortality in preweaned dairy calves are diarrhea and bovine respiratory disease complex (BRD). The delayed detection of these diseases in calves can also delay intervention and disease recovery. The overarching objective of this dissertation was to follow a cohort of calves daily for the first 90 days of life for naturally occurring clinical BRD bouts and diarrheal bouts. The objective answered if feeding behaviors and activity levels were different in at-risk calves during BRD development and BRD recovery from an antimicrobial intervention. Furthermore, the potential of colostrum replacer as a feeding intervention strategy to …
Genetic Parameter Estimates For Age At Slaughter And Days To Finish In A Multibreed Population, Lindsay R. Upperman, Larry A. Kuehn, Matthew L. Spangler
Genetic Parameter Estimates For Age At Slaughter And Days To Finish In A Multibreed Population, Lindsay R. Upperman, Larry A. Kuehn, Matthew L. Spangler
Nebraska Beef Cattle Reports
No abstract provided.
Milk Production Impacts On Cow Reproductive And Calf Growth Performance, Tasha M. King, J. A. Musgrave, R. Funston, Travis Mulliniks
Milk Production Impacts On Cow Reproductive And Calf Growth Performance, Tasha M. King, J. A. Musgrave, R. Funston, Travis Mulliniks
Nebraska Beef Cattle Reports
No abstract provided.
Dietary Impact On Antibiotic Resistance In Feedlot Manure, Maranatha Zelt, Amy Schmidt, Noelle Mware, Xu Li, Galen E. Erickson
Dietary Impact On Antibiotic Resistance In Feedlot Manure, Maranatha Zelt, Amy Schmidt, Noelle Mware, Xu Li, Galen E. Erickson
Nebraska Beef Cattle Reports
There is a growing public concern regarding antibiotic resistance and the use of antibiotics, including in livestock management. Understanding the ecology of antibiotic resistance among microbes, identifying resistance gene reservoirs, and implementing antibiotic resistance mitigation practices in livestock production are critical to protecting animal and human health while meeting increasing food demands. This research is one of several studies seeking to assess risk for livestock- to- human transfer of antibiotic resistance and to identify mechanisms for reducing that risk where possible. This study evaluated the impact of forage concentration and supplemental essential oil in beef cattle finishing diets on antibiotic …
Perceptions Of Barriers And Benefits Of Manure Use In Cropping Systems, Richard Koelsch, Daniel Andersen, Erin Cortus, Leslie Johnson, Amy Schmidt, Siok A. Siek, Melissa Wilson
Perceptions Of Barriers And Benefits Of Manure Use In Cropping Systems, Richard Koelsch, Daniel Andersen, Erin Cortus, Leslie Johnson, Amy Schmidt, Siok A. Siek, Melissa Wilson
Nebraska Beef Cattle Reports
Animal agriculture is tasked with recycling the nitrogen and phosphorus in manures in an environmentally sound manner, typically as a soil fertility amendment, which often requires voluntary transfer of manures to crop farms on which there may be little or no history of manure use. # e ability of manure to compete with commercially available fertilizers is essential for this transfer. A survey was conducted of farmers’ and their advisors’ perceptions of the benefits and barriers to manure use in crops. There exists a strong recognition of manure’s agronomic, yield, and soil health benefits. However, many challenges associated with manure …
Transforming Manure And Cedar Mulch From “Waste” To “Worth”, Karla Melgar, Agustin Olivo, Richard Koelsch, Larry Howard, Gary Lesoing, Aaron Nygren, Randy Saner, Amy D. Timmerman, Troy Walz, Todd Whitney, Amy Schmidt
Transforming Manure And Cedar Mulch From “Waste” To “Worth”, Karla Melgar, Agustin Olivo, Richard Koelsch, Larry Howard, Gary Lesoing, Aaron Nygren, Randy Saner, Amy D. Timmerman, Troy Walz, Todd Whitney, Amy Schmidt
Nebraska Beef Cattle Reports
In nearly every production environment, there are opportunities to capture profits if waste streams can be further processed or enhanced to create “value added” products. Animal feeding operations in Nebraska generate significant amounts of manure that are considered as a “waste” product. Additionally, Eastern red cedar (Juniperus virginiana) encroachment into grazing land has become an economic and ecological threat, reducing forage production, fragmenting wildlife habitats, and increasing the risk and severity of wild fires. Value- added uses for cedar woodchips are being sought by the Nebraska Forest Service and other agencies to promote tree management by landowners. Using manure and …
Accelerated Dry Aging Under Anaerobic Conditions, Joseph A. Sonderman, Soon K. Lau, Felipe A. Ribeiro, David M. Velasco, Nicolas A. Bland, Nicolas J. Herrera, Morgan L. Henriott, Jeyamkondan Subbiah, Chris Calkins
Accelerated Dry Aging Under Anaerobic Conditions, Joseph A. Sonderman, Soon K. Lau, Felipe A. Ribeiro, David M. Velasco, Nicolas A. Bland, Nicolas J. Herrera, Morgan L. Henriott, Jeyamkondan Subbiah, Chris Calkins
Nebraska Beef Cattle Reports
The purpose of dry aging is to develop novel favors and other sensory characteristics different from wet aged meat. However, leaving meat exposed to air for an extended period of time can have negative effects on meat quality. As the meat is exposed to oxygen for an extended period of time, lipids are oxidized resulting in compounds that negatively affect favor. In this study, oxygen concentration was regulated along with time, temperature, humidity, and air flow. The purpose of oxygen regulation was to determine the effect of oxidation on the quality, specifically flavor preference, of dry aged meats. Sensory analysis …
The Relationship Of Liver Abscess Scores And Early Postmortem Meat Tenderness, Nicolas J. Herrera, Felipe A. Ribeiro, Nicolas A. Bland, Morgan L. Henriott, Kellen B. Hart, Chris Calkins
The Relationship Of Liver Abscess Scores And Early Postmortem Meat Tenderness, Nicolas J. Herrera, Felipe A. Ribeiro, Nicolas A. Bland, Morgan L. Henriott, Kellen B. Hart, Chris Calkins
Nebraska Beef Cattle Reports
Acidosis is one of the most common nutritional disorders found in commercial feedlots. Cattle diets with high concentrations of starch can cause rapid production of acids in the rumen, disrupting microbial fermentation, causing liver abscess formation, and lowering livestock performance. This study was conducted to evaluate the relationship between the occurrence of liver abscesses and beef tenderness early postmortem. Results showed numerically lesser shear force values (greater tenderness) in loins from animals without liver abscesses, however, this was not statistically significant for slice shear force or Warner- Bratzler shear force. Although the effects of liver abscess occurrence in relation to …
Fate Of Generic Escherichia Coli In Beef Steaks During Sous Vide Cooking At Different Holding Time And Temperature Combinations, Heather B. Hunt, Samuel C. Watson, Byron D. Chaves, Gary Sullivan
Fate Of Generic Escherichia Coli In Beef Steaks During Sous Vide Cooking At Different Holding Time And Temperature Combinations, Heather B. Hunt, Samuel C. Watson, Byron D. Chaves, Gary Sullivan
Nebraska Beef Cattle Reports
Sous vide cookery utilizes water baths held at precise temperatures to cook food and has increased in popularity in domestic and food service settings due to ease of use and consistent final cooking temperature of food. Some sous vide manufacturers’ cooking websites suggest cooking intact and nonintact beef products to internal temperatures as low as 115º F. To address the safety concerns of cooking non- intact beef products to temperatures below USDA- FSIS guidance temperatures, steaks were internally inoculated with a strain of generic E. coli and sous vide cooked to internal temperatures of 115, 125, 130, and 145º F …
Effect Of Increasing Corn Silage Inclusion In Finishing Diets With Or Without Tylosin On Performance And Liver Abscesses, Hannah C. Wilson, Levi Mcphillips, Bradely M. Boyd, Andrea K. Watson, J. C. Macdonald, Galen E. Erickson
Effect Of Increasing Corn Silage Inclusion In Finishing Diets With Or Without Tylosin On Performance And Liver Abscesses, Hannah C. Wilson, Levi Mcphillips, Bradely M. Boyd, Andrea K. Watson, J. C. Macdonald, Galen E. Erickson
Nebraska Beef Cattle Reports
A finishing study was conducted to assess the impact of increasing silage inclusion in finishing diets to reduce the prevalence of liver abscesses in beef cattle. Cattle were fed two inclusions of corn silage (15 or 45% of diet dry matter), with or without tylosin for control of liver abscesses. Cattle fed 15% corn silage had a 2% improvement in feed efficiency when tylosin was added to the diet. However, in cattle fed 45% corn silage, no improvements in feed efficiency were observed when tylosin was added to the diet. Cattle fed 15% corn silage without tylosin, had the greatest …
Impact Of Days Fed On Holstein Bull And Steer Performance And Cutability Of Cattle Pen- Fed Organic Diets, Elizabeth A. Schumacher, Braden C. Troyer, Bradley M. Boyd, Levi Mcphillips, J. C. Macdonald, Andrea K. Watson, Terry Klopfenstein, Galen E. Erickson
Impact Of Days Fed On Holstein Bull And Steer Performance And Cutability Of Cattle Pen- Fed Organic Diets, Elizabeth A. Schumacher, Braden C. Troyer, Bradley M. Boyd, Levi Mcphillips, J. C. Macdonald, Andrea K. Watson, Terry Klopfenstein, Galen E. Erickson
Nebraska Beef Cattle Reports
Performance, carcass characteristics, and total meat yield of Holstein bulls and steers were compared in a simulated organic production system with the goal of producing ground beef. Holstein bulls (n = 120, initial BW = 487 lb) and steers (n = 120, initial BW = 471 lb) of the same age were blocked by BW and assigned randomly to be harvested at 308, 343, 378, and 413 days on feed. After harvest, all meat o" the carcass was considered trim and was collected and weighed to calculate total trim yield. Bulls gained faster and had greater live body weight, carcass …
Evaluation Of Processing Technique For High- Moisture And Dry Corn Fed To Finishing Cattle, C A. Coulson, B M. Boyd, Braden C. Troyer, Levi Mcphillips, Mitch M. Norman, Galen E. Erickson
Evaluation Of Processing Technique For High- Moisture And Dry Corn Fed To Finishing Cattle, C A. Coulson, B M. Boyd, Braden C. Troyer, Levi Mcphillips, Mitch M. Norman, Galen E. Erickson
Nebraska Beef Cattle Reports
A 134- day finishing trial was conducted to evaluate the effect of milling method and corn type on finishing cattle performance and carcass characteristics. Treatments were applied in a 2 × 3 factorial arrangement, with the first factor as milling method (Automatic Ag roller mill or hammer mill) and the second factor as corn type, either 100% dry corn, 50:50 blend of dry and high moisture corn, or 100% high moisture corn. $ ere was no interaction between milling method and corn type for carcass- adjusted final body weight, average daily gain, or dry matter intake but there was an …
Mineral Concentrations Of Forages For Livestock In Nebraska And South Dakota, Rebecca J. Kern, John W. Kern, Hannah M.G. Dorn, Carrie E. Putnam, Janna J. Block, Adele A. Harty, M. E. Drewnoski
Mineral Concentrations Of Forages For Livestock In Nebraska And South Dakota, Rebecca J. Kern, John W. Kern, Hannah M.G. Dorn, Carrie E. Putnam, Janna J. Block, Adele A. Harty, M. E. Drewnoski
Nebraska Beef Cattle Reports
Forage samples from Nebraska and South Dakota submitted to Ward Laboratories, Inc. from 2012– 2019 were analyzed for mineral concentrations. Samples were categorized by forage species, quality based on protein content, and mineral concentration based on requirements for lactating beef cows. ! e data indicate that copper and zinc are frequently deficient across all species and levels of forage quality, emphasizing the need for supplementation. Except for magnesium, macro- mineral deficiencies are less likely to occur when feeding high quality forages in Nebraska and South Dakota. Corn feedstuffs are particularly likely to result in mineral deficiencies if fed without mineral …
Evaluation Of Models Used To Predict Dry Matter Intake In Forage- Based Diets, Aksel Wiseman, Andrea K. Watson, Rick Stock, Terry Klopfenstein
Evaluation Of Models Used To Predict Dry Matter Intake In Forage- Based Diets, Aksel Wiseman, Andrea K. Watson, Rick Stock, Terry Klopfenstein
Nebraska Beef Cattle Reports
Accurately predicting intake is critical to model performance of cattle in order to formulate diets to meet nutritional requirements. Modeling systems must be accurate in order to provide correct information to producers. Multiple studies with growing cattle consuming forage- based diets were summarized. Actual gain and weights of the cattle were used to determine predicted dry matter intake using the Beef Cattle Nutrient Requirements Model (2016). ! e predicted dry matter intakes were compared to observed dry matter intakes to determine accuracy of the prediction model. ! e model over predicted intakes at low TDN and under predicted intakes at …
Growing Calf Intake Of Hay Or Crop Residue Based Diets, Aksel Wiseman, Andrea K. Watson, Rick Stock, Terry Klopfenstein
Growing Calf Intake Of Hay Or Crop Residue Based Diets, Aksel Wiseman, Andrea K. Watson, Rick Stock, Terry Klopfenstein
Nebraska Beef Cattle Reports
It is important to know or predict feed intake by growing calves on forage- based diets in order to balance these diets for nutrients such as energy and protein. Several growing calf studies with forage- based diets were summarized. ! ese studies evaluated the use of crop residue as a substitute for conventional forages, primarily grass hay. Calves gained about 1.8 lb/day for all forage- based diets. Calves consumed 2.6% of body weight daily when fed hay- based diets, but those fed residue with distillers grains diets consumed only 1.6% of body weight. However, when feeding the residue with distillers …
Winter Growth Rate And Timing Of Marketing On Economics Of Yearling Systems, Michael Merical, M. E. Drewnoski, Jay Parsons
Winter Growth Rate And Timing Of Marketing On Economics Of Yearling Systems, Michael Merical, M. E. Drewnoski, Jay Parsons
Nebraska Beef Cattle Reports
Economic analyses were conducted examining 18 years of Nebraska monthly- average auction data to ! nd the e" ects of certain management decisions on the pro! tability of yearling production systems. A 2×2 experimental design was used to examine four possible scenarios. $ e variables were either fast winter growth (daily gain, 2.0 lb/ day) or slow winter growth (daily gain, 0.8 lb/day), and either a September or a July marketing date. In addition to pro! tability, risk management was also examined in this study. Average pro! tability of all scenarios was good, ranging from $112 to $143 per calf. …
Economics Of Yearling Systems, Terry J. Klopfenstein, Mary E. Drewnoski, James C. Macdonald, Andrea K. Watson, Jay Parsons
Economics Of Yearling Systems, Terry J. Klopfenstein, Mary E. Drewnoski, James C. Macdonald, Andrea K. Watson, Jay Parsons
Nebraska Beef Cattle Reports
Economic analyses were conducted to estimate the effect of management decisions on profitability of yearling production systems. Three reported experiments were analyzed where rate of winter gain and length of summer grazing were variables. Corn stalk grazing with distillers grains supplement is quite economical. Winter gains of 1.5 to 2.0 lb/day were more profitable, aft er grass or aft er feedlot, than winter gains less than 1 lb/ day. Yearlings compensated for lower winter gains while on grass, but those gaining more in the winter gained better in the feedlot and produced heavier final weights. The analyses do not show …
Statistics Used In The Nebraska Beef Cattle Report And Their Purpose
Statistics Used In The Nebraska Beef Cattle Report And Their Purpose
Nebraska Beef Cattle Reports
Th e purpose of beef cattle and beef product research at UNL 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 Cattle 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 a more …
Impact Of Myoglobin Oxygenation State On Color Stability Of Frozen Beef Steaks, Morgan L. Henriott, Felipe A. Ribeiro, Nicolas J. Herrera, Kellen B. Hart, Nicolas A. Bland, Chris Calkins
Impact Of Myoglobin Oxygenation State On Color Stability Of Frozen Beef Steaks, Morgan L. Henriott, Felipe A. Ribeiro, Nicolas J. Herrera, Kellen B. Hart, Nicolas A. Bland, Chris Calkins
Nebraska Beef Cattle Reports
The objective of this study was to determine the impacts of myoglobin oxygenation level and frozen storage duration on frozen beef color. Strip loins were wet- aged for 4 or 20 days and were fabricated into steaks that were assigned a myoglobin oxygenation level (highly oxygenated, lowly oxygenated, or deoxymyoglobin) and packaging film (impermeable or permeable). Steaks were then frozen for 0, 2, 4, or 6 months of storage and analyzed for various beef color measurements. Highly oxygenated steaks had greater a* values (redness) and percent oxymyoglobin compared to the other treatments. Frozen storage beyond 4 months and oxygen impermeable …
Evaluating Syngenta Enogen Feed Corn Silage Or Grain On Growing Beef Cattle Performance, Mckenna M. Brinton, Bradley M. Boyd, F. Henry Hilscher, Levi J. Mcphillips, J. C. Macdonald, Galen E. Erickson
Evaluating Syngenta Enogen Feed Corn Silage Or Grain On Growing Beef Cattle Performance, Mckenna M. Brinton, Bradley M. Boyd, F. Henry Hilscher, Levi J. Mcphillips, J. C. Macdonald, Galen E. Erickson
Nebraska Beef Cattle Reports
A growing trial was conducted to evaluate Syngenta Enogen Feed Corn containing an alpha amylase enzyme trait compared with commercially available corn without the amylase enzyme trait on growing cattle performance characteristics. Corn was harvested as either corn silage or dry corn, and corn silage was further harvested with kernel processing or not. Th e treatment design was a 2×2+2 factorial with 2 hybrids of silage, kernel processed or not, and then a 40% dryrolled corn and hay growing diet as Syngenta Enogen Feed Corn or control corn. No interactions were observed between silage hybrids and kernel processing. Cattle fed …
Combined Analysis On The Effects Of Late Gestation Supplementation In A Spring Calving Beef Herd, Devin L. Broadhead, Kathy Hanford, Matthew C. Stockton, Jacki A. Musgrave, R. A. Funston
Combined Analysis On The Effects Of Late Gestation Supplementation In A Spring Calving Beef Herd, Devin L. Broadhead, Kathy Hanford, Matthew C. Stockton, Jacki A. Musgrave, R. A. Funston
Nebraska Beef Cattle Reports
Data were compiled from 4 independent studies conducted over 13 years in the Nebraska Sandhills. Th is combined analysis evaluated the effects of late gestation supplementation on cow and calf productivity in a spring calving herd. Cows wintered on dormant range, sub- irrigated meadow or corn residue. Late gestation supplementation improved pregnancy rates regardless of supplement amount or over winter treatment. Supplement did not affect cow body weight and condition score. Calves born to cows fed supplement had greater weaning weights regardless of when they were weaned.
Evaluation Of Commercial Genomic Tests For Maternal Traits In Crossbred Beef Cattle, Mckay R. Erickson, J.R. Tait, R. A. Funston
Evaluation Of Commercial Genomic Tests For Maternal Traits In Crossbred Beef Cattle, Mckay R. Erickson, J.R. Tait, R. A. Funston
Nebraska Beef Cattle Reports
DNA samples were collected from beef heifers born at the Gudmundsen Sandhills Laboratory and analyzed with a genomic test. Phenotypic data from these females were compiled and used in a regression analysis to evaluate the utility of these genomic scores as predictors for phenotypic outcomes. Th e genomic score for birth body weight (BW) was signifi cantly associated with animal birth BW. Th e genomic score for heifer pregnancy was not a statistically significant predictor of actual pregnancy. Neither dam age or the genomic score for stayability were significant predictors of actual reproductive longevity.
Efficacy Of A Second Injection Of Prostaglandin F2Α In Yearling Beef Heifers Following Previous Estrus Synchronization, Mckay R. Erickson, Kenneth C. Ramsay, R. Funston
Efficacy Of A Second Injection Of Prostaglandin F2Α In Yearling Beef Heifers Following Previous Estrus Synchronization, Mckay R. Erickson, Kenneth C. Ramsay, R. Funston
Nebraska Beef Cattle Reports
Angus- based, yearling beef heifers were utilized to determine the effects of administering a second prostaglandin F2α (PGF; Lutalyse, Zoetis Animal Health, Parsippany, NJ) injection to heifers who did not previously respond to estrus synchronization. All heifers were exposed to a melengestrolacetate (MGA)- PGF protocol. Following PGF injection, heifers were observed for estrus (estrus detection patches rubbed) for 3 d and inseminated. Heifers who did not show signs of estrus were placed with fertile bulls. Aft er 3 d with bulls, heifers with greater than 50% of the rub- off coating removed from estrus detection aids were considered to have …
Effect Of Gnrh Injection At - 72 H In Mga- Pgestrus Synchronization Protocol, Mckay R. Erickson, Dan Kelly, Doug O’Hare, T.L. Meyer, R. Funston
Effect Of Gnrh Injection At - 72 H In Mga- Pgestrus Synchronization Protocol, Mckay R. Erickson, Dan Kelly, Doug O’Hare, T.L. Meyer, R. Funston
Nebraska Beef Cattle Reports
Yearling beef heifers from 2 locations were synchronized with melengestrol acetate (MGA)- prostaglandin F2α (PGF) fi xed time AI (TAI) protocol. At PGF administration 72 h before AI, heifers were randomly assigned to receive either 0 or 5 μg gonadotropinreleasing hormone (GnRH). Th e administration of 5 μg GnRH at PGF did not increase estrus activity or improve TAI pregnancy rates at either location (Location 1, 56% (GnRH) vs. 57%; Location 2, 59% (GnRH) vs. 53%). Administering GnRH at PGF increased (74% vs. 63%) pregnancy rates for heifers inseminated during a follow- up heat detection period at one location. A …
Evaluation Of Level Of Milk Potential On Nutrient Balance In 2- And 4- Year- Old May- Calving Range Cows Grazing Sandhills Upland Range, J. Travis Mulliniks, Don C. Adams
Evaluation Of Level Of Milk Potential On Nutrient Balance In 2- And 4- Year- Old May- Calving Range Cows Grazing Sandhills Upland Range, J. Travis Mulliniks, Don C. Adams
Nebraska Beef Cattle Reports
A modeling study evaluated the effects of milk production level on nutrient balance in May- calving cows grazing Sandhills upland range during the breeding season. Forage quality of upland range peaks in June and steadily declines in July until November. With timing of forage quality decline and increasing nutrient demands due to lactation, cows were in a negative energy balance in late June and early July prior to deficiency of metabolizable protein. Supplementation to meet energy deficiencies in June and July and MP deficiencies in July with distiller grains that is high ruminally undegradable protein and high fiber energy may …
Comparison Of Rumen Undegradable Protein Content Of Conventional And Organic Feeds, Elizabeth A. Schumacher, Galen E. Erickson, Hannah C. Wilson, J. C. Macdonald, Andrea K. Watson, Terry J. Klopfenstein
Comparison Of Rumen Undegradable Protein Content Of Conventional And Organic Feeds, Elizabeth A. Schumacher, Galen E. Erickson, Hannah C. Wilson, J. C. Macdonald, Andrea K. Watson, Terry J. Klopfenstein
Nebraska Beef Cattle Reports
Knowledge of a feed ingredient’s protein content and degradability is important in formulating diets for growing cattle. However, there are limited data on protein composition and digestibility of feeds produced in an organic production system. Two studies were conducted using an in situ mobile bag procedure to compare feeds raised in organic and conventional production systems for rumen undegradable protein (RUP) content and digestibility. No differences were observed for RUP content between organic or conventional sources for dehydrated alfalfa, field peas, or expeller pressed soybean meals. Solvent extracted soybean meals were lower in RUP content than expeller pressed soybean meals. …
Effect Of Conventional Or High Protein Dry Distillers Grains Plus Solubles In Either Dry- Rolled Or Steam- Flaked Corn Based Diets On Amount And Site Of Nutrient Digestion, Lauren A. Ovinge, Mitch M. Norman, Hannah C. Wilson, Kaylee E. Wheeler, Galen E. Erickson
Effect Of Conventional Or High Protein Dry Distillers Grains Plus Solubles In Either Dry- Rolled Or Steam- Flaked Corn Based Diets On Amount And Site Of Nutrient Digestion, Lauren A. Ovinge, Mitch M. Norman, Hannah C. Wilson, Kaylee E. Wheeler, Galen E. Erickson
Nebraska Beef Cattle Reports
A 2 × 3 factorial metabolism study using 6 ruminally and duodenally cannulated heifers evaluated the site and amount of nutrient digestion when feeding high protein dry distillers grains plus solubles (DDGS) or conventionally produced DDGS at 30% inclusion compared to feeding no distillers in either dry- rolled or steam- flaked corn diets. Apparent total tract starch digestibility was unaffected by distillers treatment in SFCbased diets, but decreased from 95.1% to 92.0% when DDGS was added to DRC diets, and further decreased to 88.7% for HiPro diets. Dry matter and OM digestibilities were lower types of when either DDGS diets …