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1998 Nebraska Beef Cattle Report
1998 Nebraska Beef Cattle Report
Nebraska Beef Cattle Reports
Cow/Calf
Spring versus Summer Calving for the Nebraska Sandhills: Production Characteristics
Performance of Summer- and Spring-Born Calves Finished as Calves or Yearlings
Use of the NRC Model for Evaluating Nutrient Balances of Grazing Beef Cattle
Dried Poultry Waste as a Protein Supplement for Cows Grazing Winter Forages
Escape Protein Supplementation and Weaning Effects on Calves Grazing Meadow Regrowth
Calving Difficulty and Calf Response to Stress
Effect of Summer Grazing on Crude Protein and Digestibility of Winter Diets of Cattle in the Nebraska Sandhills
Ruminal Degradation of Rubisco by Beef Cattle Grazing Switchgrass and Big Bluestem
Evaluating Stress in Calves Weaned …
Evaluation Of Feather Meal For Calves Grazing Cornstalks, D. J. Jordon, Terry J. Klopfenstein, Mark Klemesrud
Evaluation Of Feather Meal For Calves Grazing Cornstalks, D. J. Jordon, Terry J. Klopfenstein, Mark Klemesrud
Nebraska Beef Cattle Reports
Three years of cornstalk grazing trials were conducted from 1995-97 to determine the feeding value of a sunflower, feather and blood meal supplement compared to a traditional soybean meal supplement. Analysis revealed no year x treatment interaction in years 1 and 2, so data were pooled. Gains of calves receiving soybean meal (0.97 lb/day) were not significantly different from those consuming sunflower/ feather meal (0.83 lb/day). In year 3, protein sources were evaluated for undegradable intake protein before formulation. Gains were similar between soybean meal (0.19 lb/day) and sunflower/feather meal (0.16 lb/day). A supplement containing sunflower/ feather meal is an …
Comparative Calf Grazing Of Corn And Soybean Residues, D. J. Jordon, Terry J. Klopfenstein, Mark Klemesrud
Comparative Calf Grazing Of Corn And Soybean Residues, D. J. Jordon, Terry J. Klopfenstein, Mark Klemesrud
Nebraska Beef Cattle Reports
A grazing trial was conducted in the winter of 1996-97 to compare the feeding value of soybean stubble to that of cornstalks. Irrigated bean residues were stocked at 0.5 animals/acre, while irrigated corn residues were stocked at 1.2 animals/acre. Calves grazing cornstalks gained (0.17 lb/day) faster (P = .003) than calves consuming soybean stubble (-0.03 lb/day). In addition, calves grazing cornstalks remained in fields 14 days longer. Diet samples were collected on both corn and soybean residues. Ruminally fistulated steer calves grazing bean stubble consumed diets high in crude protein (12- 25%), but low in organic matter digestibility (40-46%). Calves …
Escape Protein Supplementation And Weaning Effects On Calves Grazing Meadow Regrowth, Greg Lardy, Don C. Adams, Terry J. Klopfenstein, June Ueckert, Richard T. Clark
Escape Protein Supplementation And Weaning Effects On Calves Grazing Meadow Regrowth, Greg Lardy, Don C. Adams, Terry J. Klopfenstein, June Ueckert, Richard T. Clark
Nebraska Beef Cattle Reports
Forty spring-born calves grazing subirrigated meadow regrowth were assigned to two weaning and two supplementation treatments in the fall of 1995 and 1996. Weaning treatments were: 1) weaning September 1; or 2) nursing during the trial. Supplementation treatments were 1) no supplemental undegraded intake protein (escape protein); or 2) supplemental undegraded intake protein. No treatment interactions were detected indicating weaning and supplementation affects were independent. Nursing calves had higher weight gains (2.1 versus 1.3 lb/day) and lower forage intakes (5.2 versus 6.5 lb/day) than weaned calves. Supplemental undegraded intake protein increased weight gains of calves (1.94 versus 1.45 lb/day). We …
Cull Dry Edible Beans In Growing Calf Rations, Ivan G. Rush, Burt Weichenthal, Brad Van Pelt
Cull Dry Edible Beans In Growing Calf Rations, Ivan G. Rush, Burt Weichenthal, Brad Van Pelt
Nebraska Beef Cattle Reports
Including cull dry edible beans into diets for steer calves in two yearly trials produced slightly different results. In the first year, calculated net energy levels were higher in diets with 5 or 10% dry beans and daily gains were equal or better than for the no-bean diets. In the second year, with equal net energy values in rations containing 0, 7.5 or 15% dry beans, daily gains and feed intake decreased linearly with dry bean additions. Feed efficiency was improved as bean level increased.
Observations On Acidosis Through Continual Feed Intake And Ruminal Ph Monitoring, Rob Cooper, Terry J. Klopfenstein, Rick Stock, Cal Parrott
Observations On Acidosis Through Continual Feed Intake And Ruminal Ph Monitoring, Rob Cooper, Terry J. Klopfenstein, Rick Stock, Cal Parrott
Nebraska Beef Cattle Reports
A system of continual data acquisition of feed intake and ruminal pH has been developed for studying subacute acidosis in finishing steers. Feed intake is monitored with feedbunks which are suspended from weigh cells. Ruminal pH is monitored with submersible pH electrodes suspended in the rumen. Numerous anecdotal observations of subacute acidosis have been made throughout the feeding periods of several steers, providing information unlikely to be recognized during a planned trial. Therefore, this model for studying subacute acidosis offers many unique opportunities for enhancing our understanding of the interactions between feed intake and acidosis.
Effect Of Winter Gain On Summer Rate Of Gain And Finishing Performance Of Yearling Steers, Dale Downs, Galen E. Erickson, Don C. Adams, Terry J. Klopfenstein
Effect Of Winter Gain On Summer Rate Of Gain And Finishing Performance Of Yearling Steers, Dale Downs, Galen E. Erickson, Don C. Adams, Terry J. Klopfenstein
Nebraska Beef Cattle Reports
The effect of winter rate of gain on subsequent grazing and finishing performance was evaluated using 80 medium- framed steers. During the winter period, steers were fed to achieve gains of approximately .7 (low gain; 40 head) or 1.7 lb/day (high gain; 40 head). Warm-season Sandhills range was grazed by 20 low-gain and 20 high-gain steers, while the other 40 grazed bromegrass pasture from May to September. Both low- and high-gain cattle grazing brome pasture gained slower than those grazing sandhills range. During summer grazing, low-gain cattle gained faster than high-gain cattle, but compensated for only 19.9% (sandhills) and 18.7% …
Nutrient Balance Of Nitrogen, Organic Matter, Phosphorus And Sulfur In The Feedlot, Galen E. Erickson, Terry J. Klopfenstein, Daniel T. Walters, Gary Lesoing
Nutrient Balance Of Nitrogen, Organic Matter, Phosphorus And Sulfur In The Feedlot, Galen E. Erickson, Terry J. Klopfenstein, Daniel T. Walters, Gary Lesoing
Nebraska Beef Cattle Reports
Ninety-six crossbred yearling steers (656 lb) were assigned to either control (CON) or balanced (BAL) treatments. Steers were fed for 135 days in 12 waste-management pens with runoff collection basins. Control diet consisted of a DRC, 7.5 % roughage finisher formulated for 13.5 % protein and 0.35 % phosphorus. Balanced diet was formulated using the 1996 NRC model to meet the animal’s protein (11.5%) and phosphorus (0.22%) requirements. Gains were unaffected and feed efficiency tended to improve by feeding the BAL diet. Nitrogen and P excretion were lower with BAL steers compared with CON steers. Consequently, the manure’s N:P ratio …
Phosphorus Requirement Of Finishing Yearlings, Galen E. Erickson, Mark Klemesrud, Todd Milton, Terry J. Klopfenstein
Phosphorus Requirement Of Finishing Yearlings, Galen E. Erickson, Mark Klemesrud, Todd Milton, Terry J. Klopfenstein
Nebraska Beef Cattle Reports
Sixty yearling crossbred steers (849 lb) were fed individually either 0.35 or 0.70 % of DM as Ca and 0.14, 0.19, 0.24, 0.29 or 0.34 % P. Ash content was determined on bones from the lower front legs and one rib from each carcass was used to determine breaking strength. Performance and bone characteristics were not affected by dietary P concentration or P intake. Steers fed the 0.70 % Ca diets had lower gains and poorer efficiencies when compared to those fed 0.35 % Ca. These results indicate the requirement for finishing yearlings is 0.14 % P or less and …
A Novel Estrous Synchronization Program For Beef Cattle Using Melengestrol Acetate, Karol Fike, Michael Wehrman, Brad Lindsey, Ellen G. M. Bergfeld, Eric Melvin, Jorge Quintal, Eraldo Zanella, Freddie Kojima, James Kinder
A Novel Estrous Synchronization Program For Beef Cattle Using Melengestrol Acetate, Karol Fike, Michael Wehrman, Brad Lindsey, Ellen G. M. Bergfeld, Eric Melvin, Jorge Quintal, Eraldo Zanella, Freddie Kojima, James Kinder
Nebraska Beef Cattle Reports
Estrous synchronization rate and conception and pregnancy rates to AI were evaluated following three estrous synchronization protocols for beef cattle. During 1995 and 1996, heifers and cows (n = 379) received either: 1) melengestrol acetate (MGA) for 18 days plus an injection of progesterone and estradiol in oil 7 days before end of treatment; 2) MGA for 17 days; or 3) two injections of PGF2&#;&#;&#;10 days apart. The greatest pregnancy rates (number conceived/number treated) among both anestrous and estrual females were achieved following treatment with MGA and an injection of progesterone and estradiol.
Solvent-Extracted Germ Meal, Corn Bran And Steep Liquor Blends For Finishing Steers, Daniel Herold, Mark Klemesrud, Terry J. Klopfenstein, Todd Milton, Rick Stock
Solvent-Extracted Germ Meal, Corn Bran And Steep Liquor Blends For Finishing Steers, Daniel Herold, Mark Klemesrud, Terry J. Klopfenstein, Todd Milton, Rick Stock
Nebraska Beef Cattle Reports
Three trials evaluated solvent-extracted germ meal for finishing ruminants. Dry corn bran and steep liquor/ distillers solubles were fed in combination with solvent-extracted germ meal to evaluate interactions of byproduct blends. Byproducts enhanced intake and gain relative to dry-rolled corn diets. Adding tallow to byproduct diets increased efficiency. Feeding solvent-extracted germ meal with steep liquor heightened performance, but the benefit diminished when steep liquor level reached 30% of dry matter. Including solvent-extracted germ meal with wet corn gluten feed influenced neither daily gain nor intake. Results show solvent-extracted germ meal, either alone or blended with steep liquor/distillers solubles and dry …
Induction Of Estrus In Anestrous Suckled Beef Cows, Karol Fike, Michael Day, Keith Inskeep, James E. Kinder, Paul Lewis, Robert Short, Harold Hafs
Induction Of Estrus In Anestrous Suckled Beef Cows, Karol Fike, Michael Day, Keith Inskeep, James E. Kinder, Paul Lewis, Robert Short, Harold Hafs
Nebraska Beef Cattle Reports
Suckled anestrous beef cows (n=362) received either: 1) an intravaginal implant containing progesterone for 7 days plus a 1 mg injection of estradiol benzoate 24 to 30 hours after implant removal; 2) an intravaginal implant containing progesterone for 7 days; 3) a sham implant for 7 days plus a 1 mg injection of estradiol benzoate 24 to 30 hours after implant removal; or 4) a sham implant for 7 days. Treatment with progesterone resulted in resumption of luteal function in suckled anestrous beef cows with most cows developing corpora lutea with a typical lifespan, whereas treatment with estradiol benzoate enhanced …
Prolonged Elevated Concentrations Of Estradiol Do Not Affect Conception Rates In Beef Cattle, Karol Fike, Michael Wehrman, Ellen G. M. Bergfeld, Freddie Kojima, James E. Kinder
Prolonged Elevated Concentrations Of Estradiol Do Not Affect Conception Rates In Beef Cattle, Karol Fike, Michael Wehrman, Ellen G. M. Bergfeld, Freddie Kojima, James E. Kinder
Nebraska Beef Cattle Reports
Following treatments causing either prolonged elevated concentrations of estradiol associated with development of persistent follicles or inhibited elevated concentrations of estradiol and development of persistent follicles, conception rates were compared. Beef females received either four norgestomet implants for 9 days (day 0 = treatment initiation; n=59) or one norgestomet implant for 7 days and three additional norgestomet implants for 2 days (n=60). All implants were removed on day 9 followed by estrous detection and AI for 7 days. Treatment and day interacted to affect estradiol concentrations from day 0 to day 9 with elevated estradiol in females treated with one …
Dietary Calcium And Phosphorous: Relationship To Beef Tenderness And Carcass Maturity, Dana Hanson, Galen E. Erickson, Chris R. Calkins, Terry J. Klopfenstein, Todd Milton, Mark Klemesrud
Dietary Calcium And Phosphorous: Relationship To Beef Tenderness And Carcass Maturity, Dana Hanson, Galen E. Erickson, Chris R. Calkins, Terry J. Klopfenstein, Todd Milton, Mark Klemesrud
Nebraska Beef Cattle Reports
The effect of dietary mineral status as related to carcass maturity or meat tenderness was studied. Finishing yearling steers were individually fed varying levels of calcium and phosphorous. Neither mineral was significantly related to overall carcass maturity scores or meat tenderness. When fed at the levels in this trial, it appears there are no adverse effects of dietary calcium and phosphorous on carcass or meat characteristics.
Dried Poultry Waste As A Protein Supplement For Cows Grazing Winter Forages, D. J. Jordon, Terry J. Klopfenstein, Don C. Adams, Jackie Johnson, Mark Klemesrud, James A. Gosey
Dried Poultry Waste As A Protein Supplement For Cows Grazing Winter Forages, D. J. Jordon, Terry J. Klopfenstein, Don C. Adams, Jackie Johnson, Mark Klemesrud, James A. Gosey
Nebraska Beef Cattle Reports
Two trials conducted in 1996-1997 evaluated dried poultry waste relative to soybean meal for cows grazing winter forages. In Trial 1, cows grazing native Sandhills winter range received: 1) no supplement; 2) urea; 3) 22% dried poultry waste+urea; 4) soybean meal; 5) 22% dried poultry waste+soybean meal; or 6) 44% dried poultry waste. Cows receiving supplements gained more weight (P<.001) and maintained greater body condition (P<.001) than unsupplemented cows. Cows receiving urea gained less (P<.10) than cows receiving more natural protein, although body condition remained similar. In Trial 2, cows grazing cornstalks received supplements containing either soybean meal or dried poultry waste; however, gains were not different.
Lime Filtrate As A Calcium Source For Finishing Cattle, Mark Klemesrud, Terry J. Klopfenstein, Todd Milton
Lime Filtrate As A Calcium Source For Finishing Cattle, Mark Klemesrud, Terry J. Klopfenstein, Todd Milton
Nebraska Beef Cattle Reports
Finishing diets containing wet corn gluten feed were fed to 128 yearling steers to evaluate inclusion of lime filtrate as the source of supplemental calcium. Lime filtrate supplied 0, 50, 100 and 150% of the base calcium level of .70%, with limestone supplying the remainder. While dry matter intake was reduced for the 100% level of calcium from lime filtrate (P<.10), average daily gain and feed efficiency were not different from the limestone control. The 150% level of calcium from lime filtrate did reduce average daily gain and feed efficiency (P<.10).
Nutrient Balance On Nebraska Feedlots, Richard K. Koelsch, Gary Lesoing
Nutrient Balance On Nebraska Feedlots, Richard K. Koelsch, Gary Lesoing
Nebraska Beef Cattle Reports
A balance between the nutrient inputs and the managed nutrient outputs balance was constructed for 16 Nebraska feedlots to provide insight to potential environmental risks. Substantial nitrogen and phosphorus imbalances were observed for many participating feedlots. Size of the livestock operation and the degree of integration of livestock with a cropping operations provided only limited explanation concerning nutrient balance variations observed among the feedlots. Substantially improved nutrient balances were achieved by those feedlots marketing manure nutrients to off-farm customers. A “sustainable” nutrient balance appears possible for larger feedlots actively marketing manure nutrients.
Spring Versus Summer Calving For The Nebraska Sandhills: Production Characteristics, Greg Lardy, Terry J. Klopfenstein, Don C. Adams, Dick Clark, Jackie Johnson, Andy Applegarth
Spring Versus Summer Calving For The Nebraska Sandhills: Production Characteristics, Greg Lardy, Terry J. Klopfenstein, Don C. Adams, Dick Clark, Jackie Johnson, Andy Applegarth
Nebraska Beef Cattle Reports
Effects of summer calving versus traditional spring calving were investigated over three years. Calving dates were: 1) March to April (beginning March 18) for spring calving and 2) mid-June to mid-August (beginning June 18) for summer calving. Spring-born calves were weaned in October, while summer-born calves were weaned in November or January. Summer calving cows were bred either on native range or subirrigated meadow. Birth weights were higher for summer-born calves, although weaning weights were lower. Pregnancy rates for spring-calving cows bred on native range were similar to summer-calving cows bred on subirrigated meadow or native range. Summer calving reduced …
Use Of The Nrc Model For Predicting Nutrient Balances Of Finishing Cattle, Greg Lardy, Rob Mccoy, Drew Shain, Todd Milton, Dennis R. Brink, Terry J. Klopfenstein
Use Of The Nrc Model For Predicting Nutrient Balances Of Finishing Cattle, Greg Lardy, Rob Mccoy, Drew Shain, Todd Milton, Dennis R. Brink, Terry J. Klopfenstein
Nebraska Beef Cattle Reports
Trials conducted at the University of Nebraska’s Research Feedlot were used to validate the NRC Beef Cattle Nutrient Requirements Model. Guidelines were developed for nutrient values for feedstuffs commonly fed in Nebraska feedlots. Generally, the NRC model predicted DIP and MP balances which were in agreement with performance data. The NRC Model generally under-predicted feed intake. The NRC model correctly predicted DIP deficiencies in dry-rolled corn diets which did not contain supplemental degradable protein. The effective NDF level of wet corn gluten feed appears to be higher than that of dry-rolled corn. The NRC model is a useful tool for …
Extended Grazing And Byproduct Diets In Beef Growing Finishing Systems, Ramiro Lucena, Terry J. Klopfenstein, Mark Klemesrud, Rob Cooper
Extended Grazing And Byproduct Diets In Beef Growing Finishing Systems, Ramiro Lucena, Terry J. Klopfenstein, Mark Klemesrud, Rob Cooper
Nebraska Beef Cattle Reports
Two experiments evaluated methods of reducing costs of finished beef. The first experiment, used lambs as a model for cattle. A dry rolled corn diet served as a control and two byproduct diets: 1) corn gluten feed; or 2) gluten feed plus wheat midds, were supplemented with three levels of tallow. Byproduct diets gave feed efficiencies nearly equal to corn and efficiencies increased with tallow supplementation. In the second experiment, 128 steers were used in grazing systems including smooth brome, warm-season grasses, oats and cornstalks and finished on corn or byproduct diets. High forage gains reduced costs and slaughter breakevens.
In Situ Method For Estimating Forage Protein Degradability, Ryan Mass, Greg Lardy, Rick Grant, Terry J. Klopfenstein
In Situ Method For Estimating Forage Protein Degradability, Ryan Mass, Greg Lardy, Rick Grant, Terry J. Klopfenstein
Nebraska Beef Cattle Reports
Four experiments including vegetative and dormant forages tested modifications of the in situ neutral detergent fiber nitrogen (NDFN) method of estimating forage undegraded intake protein (UIP). Experiments 1, 2 and 3 tested bag size, closure, rinsing, density, and reflux conditions. None of the modifications affected in situ NDFN content. Experiment 4 compared rates of in situ NDFN digestion calculated with or without correction for undegradability. A close relationship exists between rates calculated by the two methods. Modifications make the improved in situ NDFN method a more desirable means of estimating forage UIP than the standard method.
Tenderness And Retail Stability Of Hydrodyne-Treated Beef, Bernadette O'Rourke, Chris R. Calkins, Rose Rosario, Morse Solomon, John Long
Tenderness And Retail Stability Of Hydrodyne-Treated Beef, Bernadette O'Rourke, Chris R. Calkins, Rose Rosario, Morse Solomon, John Long
Nebraska Beef Cattle Reports
Detonating a small explosive within a water-filled, stainless steel tank, creates a shock wave which penetrates vacuum-packaged meat. The acoustical match between water and meat caused an immediate and significant (P<.05) reduction in shear force. After an additional 10 days of aging, no tenderness differences (P>.05) were detected. Hydrodyne created no differences in pH, sarcomere length, purge, oxidative rancidity, bacterial counts (anaerobic or aerobic) or panel color ratings for either cut. Treated samples had higher Hunter L* values. The Hydrodyne process can tenderize unaged meat with no detriment to product display or shelf stability characteristics.
Metabolism And Digestibility Of Corn Bran And Corn Steep Liquor/Distillers Solubles, Tony Scott, Terry J. Klopfenstein, Rick Stock, Rob Cooper
Metabolism And Digestibility Of Corn Bran And Corn Steep Liquor/Distillers Solubles, Tony Scott, Terry J. Klopfenstein, Rick Stock, Rob Cooper
Nebraska Beef Cattle Reports
Six ruminally cannulated steers and six intact steers were used in a 6x6 Latin square design to determine the effect of corn bran and/or corn steep liquor/distillers solubles on ruminal metabolism and digestibility. Steers fed corn steep liquor/distiller’s solubles had lower average daily pH. Corn bran helped maintain a higher average pH. Corn steep liquor/distillers solubles fed alone altered the fermentation pattern of steers. There was a tendency for corn bran to reduce digestibility and for corn steep liquor/distillers solubles to improve digestibility.
Summer And Fall Forage Grazing Combinations: Five-Year Summary, Drew Shain, Terry J. Klopfenstein, D. J. Jordon, Rick Stock
Summer And Fall Forage Grazing Combinations: Five-Year Summary, Drew Shain, Terry J. Klopfenstein, D. J. Jordon, Rick Stock
Nebraska Beef Cattle Reports
A five-year study using British-breed crossbred cattle included slaughter breakeven analysis and evaluated the effect of grazing alternative summer and fall forages on beef production systems. Grazed summer and fall forage combinations included continuous brome and combinations of brome, warm-season grasses, alfalfa, sudangrass, red clover, native Sandhills range, turnips, rye and cornstalks. The most consistent improvement in summer grazing gain and most desirable slaughter breakeven costs were observed in cattle grazing brome and warm-season grasses or brome and Sandhills range. A reduction in slaughter breakeven cost by grazing fall forages was observed in years with adequate moisture for forage growth. …
Ruminal Degradation Of Rubisco By Beef Cattle Grazing Switchgrass And Big Bluestem, Dan Vaughn, Walter H. Schacht, Lowell E. Moser, Robert Graybosch, Terry J. Klopfenstein
Ruminal Degradation Of Rubisco By Beef Cattle Grazing Switchgrass And Big Bluestem, Dan Vaughn, Walter H. Schacht, Lowell E. Moser, Robert Graybosch, Terry J. Klopfenstein
Nebraska Beef Cattle Reports
This two-year study was conducted on monocultures of switchgrass and big bluestem to: (1) determine the concentration of the protein ribulose-1,5- bisphosphate carboxylase (Rubisco), found only in the bundle sheath cells of warm-season grasses, in omasal, masticate and fecal samples of grazing cattle; and (2) estimate rumen-escape Rubisco via bundle sheath cells. A quantifying enzyme-linked immunosorbent assay, along with estimates of rumen and lower tract digestibilities, indicated as much as 11% of Rubisco in big bluestem and 13% in switchgrass escaped rumen degradation and was absorbed in the lower tract. Realizing these amounts of escape Rubisco represent a significant level …
Evaluating Stress In Calves Weaned At Three Different Ages, Andrea Bueno, Todd Cappel, Chuck Story, Richard J. Rasby, Edd Clemens, Mark Dragastin
Evaluating Stress In Calves Weaned At Three Different Ages, Andrea Bueno, Todd Cappel, Chuck Story, Richard J. Rasby, Edd Clemens, Mark Dragastin
Nebraska Beef Cattle Reports
Trials were conducted to evaluate the effects of weaning calves at 150, 210 and 270 days of age (i.e. August, October and December, respectively). A total of 75 Angus x MARC II heifers calves were used in this study. Heifers were bled on the day of weaning and again at 2, 7, 14 and 28 days after weaning. Blood was analyzed for differential WBC, cortisol, T3 and glucose. Weight changes were recorded. The data suggests October weaned calves (210 days) had both greater blood cortisol and glucose at days 7, 14 and 28 post-weaning and greater weight gains when …
Calving Difficulty And Calf Response To Stress, Todd Cappel, Andrea Bueno, Edd Clemens
Calving Difficulty And Calf Response To Stress, Todd Cappel, Andrea Bueno, Edd Clemens
Nebraska Beef Cattle Reports
Calving difficulty altered the stress-related capabilities of the calf, placing the newborn in a compromised situation. Calves derived by severe mechanical pull or cesarean section exhibited depressed short-term defensive capabilities, lower cortisol and elevated neutrophil values, necessary for fighting infectious organisms. Of equal concern: when compared to calves born with little or no parturition difficulty, the stressed calves failed to develop effective adaptive mechanisms, having lower thyroid activity and lymphocyte values of principle importance for long-term survival. Neither the heifer’s mothering ability nor her disposition tended to influence her calf’s stress indicators.
Effects Of Luteinizing Hormone Releasing Hormone Antagonist On The Bovine Corpus Luteum, Debra T. Clopton, Jorge Quintal, Freddie Kojima, Karol Fike, Jim Kinder
Effects Of Luteinizing Hormone Releasing Hormone Antagonist On The Bovine Corpus Luteum, Debra T. Clopton, Jorge Quintal, Freddie Kojima, Karol Fike, Jim Kinder
Nebraska Beef Cattle Reports
The size and function of the corpus luteum were examined after administration of luteinizing hormone releasing hormone antagonist. Luteinizing hormone releasing hormone antagonist was administered to three animal groups starting: 1) 2 days before the preovulatory luteinizing hormone surge inducing ovulation; 2) at initiation of the preovulatory surge; and 3) 2 days after the preovulatory surge. Although size and function of the corpus luteum were suppressed in all treated groups, the greatest developmental suppression occurred when luteinizing hormone release was blocked 2 days before the preovulatory surge of LH inducing ovulation. Therefore, optimal pregnancy rates in cattle may depend on …
Effects Of Feed Intake Variation On Acidosis And Performance Of Finishing Steers, Rob Cooper, Terry J. Klopfenstein, Rick Stock, Cal Parrott, Dan Herold
Effects Of Feed Intake Variation On Acidosis And Performance Of Finishing Steers, Rob Cooper, Terry J. Klopfenstein, Rick Stock, Cal Parrott, Dan Herold
Nebraska Beef Cattle Reports
Four metabolism and two finishing trials were conducted to determine the effects of imposed feed intake variation on acidosis and performance of finishing steers. In metabolism trials, intake variation of 3 lb DM/day increased acidosis of limit-fed steers as measured by ruminal pH. However, when steers were fed at ad libitum levels of intake, intake variation of up to 4 lb DM/day did not increase acidosis. In finishing trials, imposed intake variation of 4 lb DM/day neither decreased daily gain nor feed efficiency of steers fed at ad libitum levels of intake.
Effect Of Summer Grazing On Crude Protein And Digestibility Of Winter Diets Of Cattle In The Nebraska Sandhills, Dale Downs, Don C. Adams, Terry J. Klopfenstein, Walter H. Schacht, Patrick E. Reece
Effect Of Summer Grazing On Crude Protein And Digestibility Of Winter Diets Of Cattle In The Nebraska Sandhills, Dale Downs, Don C. Adams, Terry J. Klopfenstein, Walter H. Schacht, Patrick E. Reece
Nebraska Beef Cattle Reports
Twenty-one pastures (three pastures/ treatment) were used in a two-year study to determine the effects of summer grazing on winter diet quality of Sandhills range. Summer grazing treatments consisted of no summer grazing (control) and June or July grazing at three stocking rates. After summer grazing, pastures were then diet sampled using esophageally fistulated cows in November, January and March following summer treatments. Year and sampling date had a significant effect on CP and IVDMD of winter range diets, whereas summer grazing treatments did not have a large impact.