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2006

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Articles 301 - 330 of 590

Full-Text Articles in Animal Sciences

Effect Of Corn Processing In Finishing Diets Containing Wet Distillers Grains On Feedlot Performance And Carcass Characteristics Of Finishing Steers, Kyle J. Vander Pol, Galen E. Erickson, Matthew A. Greenquist, Terry J. Klopfenstein, Thomas Robb Jan 2006

Effect Of Corn Processing In Finishing Diets Containing Wet Distillers Grains On Feedlot Performance And Carcass Characteristics Of Finishing Steers, Kyle J. Vander Pol, Galen E. Erickson, Matthew A. Greenquist, Terry J. Klopfenstein, Thomas Robb

Nebraska Beef Cattle Reports

An experiment evaluated the effects of six corn processing methods in feedlot diets containing 30% (DM basis) wet distillers grains plus solubles (WDGS). Treatments consisted of whole corn, dry-rolled corn, a dry-rolled/ high-moisture corn mix, high-moisture corn, steam flaked corn, and fine ground corn. The ADG was highest for steers receiving dry-rolled corn, high-moisture corn, or a 50:50 blend of dry-rolled and high-moisture corn. Feed conversion was best for steers receiving high-moisture corn. Interestingly, cattle fed finely ground corn or steam-flaked corn did not gain or convert as well as expected. Results indicate that there is a performance advantage obtained …

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Effect Of Dietary Inclusion Of Wet Distillers Grains On Feedlot Performance Of Finishing Cattle And Energy Value Relative To Corn, Kyle J. Vander Pol, Galen E. Erickson, Terry J. Klopfenstein, Matthew A. Greenquist, Thomas Robb Jan 2006

Effect Of Dietary Inclusion Of Wet Distillers Grains On Feedlot Performance Of Finishing Cattle And Energy Value Relative To Corn, Kyle J. Vander Pol, Galen E. Erickson, Terry J. Klopfenstein, Matthew A. Greenquist, Thomas Robb

Nebraska Beef Cattle Reports

An experiment evaluated the effects of six dietary inclusions of wet distillers grain plus solubles (WDGS) on feedlot performance and carcass characteristics of yearling steers, and also evaluated the energy value of WDGS relative to corn. Treatments consisted of 0, 10, 20, 30, 40, and 50% (DM basis) dietary inclusion of WDGS. Final BW, DMI, and ADG increased quadratically, while feed: gain decreased quadratically as WDGS inclusion increased from 0 to 50% of DM. No differences in carcass characteristics were observed among treatments. Energy value of WDGS relative to corn was above 100% for all inclusion levels and decreased (178 …

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Evaluation Of A Low Protein Distillers By-Product For Finishing Cattle, Virgil R. Bremer, Galen E. Erickson, Terry J. Klopfenstein, Kyle J. Vander Pol, Matthew A. Greenquist, Matthew L. Gibson Jan 2006

Evaluation Of A Low Protein Distillers By-Product For Finishing Cattle, Virgil R. Bremer, Galen E. Erickson, Terry J. Klopfenstein, Kyle J. Vander Pol, Matthew A. Greenquist, Matthew L. Gibson

Nebraska Beef Cattle Reports

An experiment was conducted to evaluate the effect of level of a low protein distillers by-product, Dakota Bran Cake (DBRAN), on feedlot performance and carcass characteristics of yearling steers. Diets contained 0, 15, 30, 45% DBRAN, or 30% dried distillers grains plus solubles (DDGS), replacing corn (DM basis). Final BW, ADG, and F:G improved linearly and daily DMI had a quadratic positive response as level of DBRAN in the diet increased. With the exception of HCW, there were no significant differences for carcass characteristics. The DBRAN had feeding performance similar to DDGS at the same inclusion level. Feeding DBRAN in …

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Effect Of Min-Ad Ruminal Buffer And Roughage Level On Ruminal Metabolism And Extent Of Digestion In Steers, Grant I. Crawford, Terry J. Klopfenstein, Galen E. Erickson, Clint Krehbiel, Greg Nunnery Jan 2006

Effect Of Min-Ad Ruminal Buffer And Roughage Level On Ruminal Metabolism And Extent Of Digestion In Steers, Grant I. Crawford, Terry J. Klopfenstein, Galen E. Erickson, Clint Krehbiel, Greg Nunnery

Nebraska Beef Cattle Reports

Six ruminally and duodenally cannulated steers were used in a metabolism experiment to determine effects of adding a ruminal buffer to diets containing increasing levels of roughage. Steers were fed high-concentrate diets containing 4.5, 9.0, or 13.5% alfalfa hay with or without 1.0% MIN-AD ruminal buffer. There were no differences observed in feed intake, ruminal metabolism, or total tract digestibility due to MIN-AD inclusion in the diet. Average pH increased and time below pH 5.6 and pH 5.3 decreased with increasing alfalfa level. Total tract digestibility decreased with increasing alfalfa level. Addition of MIN-AD to high-concentrate diets did not produce …

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Sodium Chloride And Soybeans In Feedlot Diets, Sheryl L. Colgan, Terry L. Mader Jan 2006

Sodium Chloride And Soybeans In Feedlot Diets, Sheryl L. Colgan, Terry L. Mader

Nebraska Beef Cattle Reports

Two trials were conducted to evaluate feeding sodium chloride salt (NaCl) and soybeans to feedlot cattle in summer and winter seasons. The treatments were 1) control; 2) 1% added salt; 3) 5% added whole soybeans; and 4) the combination of 1% added salt and 5% added whole soybeans. Added salt had a tendency to decrease dry matter intake and increase water intake. Additional salt and soybeans elevated tympanic temperatures. Treatment did not have an effect on performance, carcass quality grade, or dressing percentage.

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Effects Of Field Pea Level And Processing In Finishing Diets, Erin M. Fendrick, Ivan G. Rush, David D. Baltensperger, Dennis R. Brink, Galen E. Erickson Jan 2006

Effects Of Field Pea Level And Processing In Finishing Diets, Erin M. Fendrick, Ivan G. Rush, David D. Baltensperger, Dennis R. Brink, Galen E. Erickson

Nebraska Beef Cattle Reports

Cattle were fed coarse rolled or whole field peas in a finishing diet to determine impact on finishing performance. The peas were included in the diet DM at 0%, 15%, and 30%. There were no significant differences in ADG, F:G, or carcass characteristics among processing methods or field pea level. DMI was significantly different due to level and not processing of peas. The DMI increased as the field peas inclusion increased to 30% the diet DM Field peas can be fed whole and replace corn in the diet up to 30%.

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Vaccination For Escherichia Coli O157:H7 In Market Ready Feedlot Cattle, Robert Peterson, David R. Smith, Rodney A. Moxley, Terry J. Klopfenstein, Galen E. Erickson, Susan Hinkley Jan 2006

Vaccination For Escherichia Coli O157:H7 In Market Ready Feedlot Cattle, Robert Peterson, David R. Smith, Rodney A. Moxley, Terry J. Klopfenstein, Galen E. Erickson, Susan Hinkley

Nebraska Beef Cattle Reports

A clinical trial was conducted during the summer of 2004 to evaluate the effects of vaccinating cattle against Escherichia coli on the probability of detecting E. coli O157:H7 in feces and colonization at the terminal rectum. The probability for vaccinated or nonvaccinated cattle to shed E. coli O157:H7 in feces was not significantly different. However, the probability for steers to be colonized by E. coli O157:H7 in the terminal rectum was greatly reduced for vaccinated (0.3%) compared with nonvaccinated (20.0%) steers. We concluded that the vaccine was effective at reducing colonization of E. coli O157:H7 at the terminal rectum of …

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Large-Scale Clinical Trial To Evaluate An Experimental Escherichia Coli Vaccine, Robert E. Peterson, David R. Smith, Rodney A. Moxley, Terry J. Klopfenstein, Susan Hinkley, Galen E. Erickson Jan 2006

Large-Scale Clinical Trial To Evaluate An Experimental Escherichia Coli Vaccine, Robert E. Peterson, David R. Smith, Rodney A. Moxley, Terry J. Klopfenstein, Susan Hinkley, Galen E. Erickson

Nebraska Beef Cattle Reports

A clinical trial was conducted within 19 Nebraska feedlots to evaluate effects of an E. coli vaccine on the probability to detect E. coli O157:H7 on ROPES or for cattle to be colonized by E. coli O157:H7 at the terminal rectum. Vaccinated pens of cattle were less likely to test ROPE-positive than nonvaccinated pens of cattle and a lower probability for E. coli O157:H7 colonization among vaccinated cattle compared with nonvaccinated cattle was observed. The vaccine was effective at reducing E. coli O157:H7 in the feedlot pen environment and colonization at the terminal rectum of cattle.

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Effect Of Optaflexx Dosage And Duration Of Feeding Prior To Slaughter On Feed Conversion And Carcass Characteristics, Grant I. Crawford, Galen E. Erickson, Kyle J. Vander Pol, Matthew A. Greenquist, Jeffrey Folmer, Mike Van Koevering Jan 2006

Effect Of Optaflexx Dosage And Duration Of Feeding Prior To Slaughter On Feed Conversion And Carcass Characteristics, Grant I. Crawford, Galen E. Erickson, Kyle J. Vander Pol, Matthew A. Greenquist, Jeffrey Folmer, Mike Van Koevering

Nebraska Beef Cattle Reports

Finishing steer calves were fed 0, 100, or 200 mg/head/day of Optaflexx for the final 28, 35, or 42 days of the finishing period. Steers were started on Optaflexx treatment at one-week intervals and marketed as a single group. Feeding Optaflexx to feedlot steers increased ADG, improved F:G, and increased carcass weight. Feeding 200 mg/head/day of Optaflexx improved feed conversion by 8.1% without impacting carcass characteristics. Feeding Optaflexx at 200 mg/head/d for 28 to 42 days appears beneficial when compared with feeding diets without Optaflexx.

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Nitrogen Mass Balance And Cattle Performance Of Steers Fed Clinoptilolite Zeolite Clay, Dawn M. Sherwood, Galen E. Erickson, Terry J. Klopfenstein Jan 2006

Nitrogen Mass Balance And Cattle Performance Of Steers Fed Clinoptilolite Zeolite Clay, Dawn M. Sherwood, Galen E. Erickson, Terry J. Klopfenstein

Nebraska Beef Cattle Reports

A winter and a summer nitrogen mass balance experiment were conducted to analyze effects of feeding clinoptilolite zeolite clay to steers. No differences were found in steer ADG, F/G or carcass characteristics. Nitrogen mass balance and volatilization were not affected by a 1.2% addition of clinoptilolite in feedlot diets. These experiments indicate clinoptilolite zeolite clay does not have a large enough cation exchange potential to be effective in reducing N volatilization in open feedlot pens.

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Factors Affecting Nitrogen Losses As Measured Using Forced-Air Wind Tunnels And Nitrogen Mass Balance, Dawn M. Sherwood, Galen E. Erickson, Terry J. Klopfenstein, Dennis D. Schulte, Richard R. Stowell Jan 2006

Factors Affecting Nitrogen Losses As Measured Using Forced-Air Wind Tunnels And Nitrogen Mass Balance, Dawn M. Sherwood, Galen E. Erickson, Terry J. Klopfenstein, Dennis D. Schulte, Richard R. Stowell

Nebraska Beef Cattle Reports

Two experiments using wind tunnels were conducted in conjunction with a N mass balance to evaluate the effect of clinoptilolite zeolite clay on ammonia (NH3) losses. Ammonia losses were measured using the wind tunnels during the last six weeks of each feeding period and compared to losses calculated using a N mass balance. Nitrogen loss, pH, surface DM and N contents, and soil and surface temperatures were assessed as possible contributing factors. There were no differences in NH3 volatilization due to dietary treatments. N loss was influenced by date, % DM, surface N and soil temperature. As …

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Economics Of Manure Phosphorus Distribution From Beef Feeding Operations, William F. Kissinger, Galen E. Erickson, Richard K. Koelsch, Raymond E. Massey Jan 2006

Economics Of Manure Phosphorus Distribution From Beef Feeding Operations, William F. Kissinger, Galen E. Erickson, Richard K. Koelsch, Raymond E. Massey

Nebraska Beef Cattle Reports

An economic model was developed to evaluate cost and value of manure distribution. A 2,500 head feedlot was used as a case study to calculate excretion amounts from cattle fed diets with a range of phosphorus. Diet P and subsequent costs of distributing that manure were used to analyze the corresponding costs of manure P distribution, in addition to determining the required acres needed to be in compliance with a nutrient management plan (NMP) based on use of manure P by the crops grown. The model illustrated when animals are fed diets of increasing P concentration, total distribution cost increased, …

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Valuing Feedyard Management Education, Experience, And Expertise, Rik R. Smith, Darrell R. Mark Jan 2006

Valuing Feedyard Management Education, Experience, And Expertise, Rik R. Smith, Darrell R. Mark

Nebraska Beef Cattle Reports

This study uses a mail survey to determine the value Nebraska feedyard operators place on education, experience, and area of expertise in new assistant manager hires. Using conjoint analysis, calculations are made that estimate the marginal value of moving from one level of these attributes to another. Results show that operators preferred higher levels of education and experience. However, relevant experience was preferred over formal education. As an area of expertise, animal health was valued highest by operators of feedyards in all size categories for new assistant managers. Personnel management was valued lowest. Results suggest prospective assistant managers can maximize …

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Alternative Enhancement Strategies For Beef Muscles, Donald A. Moss, Chris R. Calkins Jan 2006

Alternative Enhancement Strategies For Beef Muscles, Donald A. Moss, Chris R. Calkins

Nebraska Beef Cattle Reports

USDA Select grade semitendinosus (eye of round) muscles from 12 cattle were used for controls (non-enhanced); salt and phosphate enhanced; water enhanced, or enhanced by addition of 10% of a solution containing 1, 3, or 5% sodium citrate to evaluate the effect of citrate on meat tenderness. Shear force and trained taste panel ratings were not different, (P > 0.05) between controls and citrate-treated muscles. Less than half of the enhancement solution was retained by the muscle. Perhaps the high connective tissue content of the semitendinosus or poor retention of the enhancement solution contributed to these results, which are in conflict …

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Flavor Relationships Among Muscles Of The Beef Chuck And Round, Jessica Meisinger, Chris R. Calkins Jan 2006

Flavor Relationships Among Muscles Of The Beef Chuck And Round, Jessica Meisinger, Chris R. Calkins

Nebraska Beef Cattle Reports

Flavor relationships among muscles and causes of liver-like off-flavor of six muscles from each of 30 beef carcasses were evaluated by a trained sensory panel. The infraspinatus (flat iron) was lowest in sour, metallic, and oxidized flavors and highest in fatty flavor. The vastus lateralis (knuckle side) had the most intense off-flavor and was among the highest for sour and oxidized. Heme iron concentration and pH were lowly related to off-flavor. Of 18 muscles from three carcasses, 16 were high in liver-like off-flavor. These data suggest liver-like off-flavor is related to something that impacts the entire animal.

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Statistics Used In The Nebraska Beef Report And Their Purpose Jan 2006

Statistics Used In The Nebraska Beef Report And Their Purpose

Nebraska Beef Cattle Reports

The 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. The 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 a more detailed description of …

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Nebraska 2006 Beef Cattle Report Jan 2006

Nebraska 2006 Beef Cattle Report

Nebraska Beef Cattle Reports

Table of Contents

Cow/Calf
Effects of Supplementing Beef Cows with Lipid from Whole Corn Germ
Effects of Supplementing Lactating, June-calving Cows on Second-calf Pregnancy Rates
Effects of Pre- and Postpartum Nutrition on Reproduction in Spring Calving Cows and Calf Feedlot Performance
Effects of Dam Nutrition on Growth and Reproductive Performance of Heifer Calves
A System for Wintering Beef Heifers Using Dried Distillers Grains
Feeding Melengestrol Acetate to Bulls Prior to and at Puberty Alters Body Weight, and Hormone Concentration
Vascular Endothelial Growth Factor mRNA Isoforms 120 and 164 Are Differentially Regulated Prior to Ovulation
Bull Exposure, When Combined with a …

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Effects Of Supplementing Dried Distillers Grains To Steers Grazing Summer Sandhill Range, Sarah Morris, James C. Macdonald, Terry J. Klopfenstein, Don C. Adams, Rex Davis, James R. Teichert Jan 2006

Effects Of Supplementing Dried Distillers Grains To Steers Grazing Summer Sandhill Range, Sarah Morris, James C. Macdonald, Terry J. Klopfenstein, Don C. Adams, Rex Davis, James R. Teichert

Nebraska Beef Cattle Reports

Yearling steers continuously grazed summer native Sandhill range, with supplementation of varying levels of dried distillers grains with solubles (DDGS): 0.26, 0.51, 0.77, and 1.03% BW. Forage intakes were predicted using an equation based on TDN. Forage intakes linearly decreased as level of DDGS increased. Average daily gain linearly increased as level of DDGS increased. Steers were finished and slaughtered. No significant differences were found in feedlot performance or carcass data. Economical analyses were conducted and suggest supplementing DDGS is profitable. Increased gain from supplementing yearling steers DDGS while grazing summer range did not affect feedlot performance and can be …

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Summary Of Manure Amounts, Characteristics, And Nitrogen Mass Balance For Open Feedlot Pens In Summer Compared To Winter, William F. Kissinger, Galen E. Erickson, Terry J. Klopfenstein Jan 2006

Summary Of Manure Amounts, Characteristics, And Nitrogen Mass Balance For Open Feedlot Pens In Summer Compared To Winter, William F. Kissinger, Galen E. Erickson, Terry J. Klopfenstein

Nebraska Beef Cattle Reports

Data from 18 experiments (244 pen means) over a 10-year period were summarized in order to make a long term comparison between seasons dealing with nutrient mass balance studies and characteristics and amount of manure from open feedlot pens. The amount of manure DM increased from 10.6 lb to 20.0 lb/head finished/day from summer (May to September) to winter (November to May). Quantities of OM, ash, and N (lb/head finished/day) increased from 2.5 lb OM, 8.1 lb ash, and 0.13 lb N to 4.8 lb OM, 15.2 lb ash, and 0.22 lb N/ head finished/day from summer to winter, respectively. …

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Differential Habituation Of Male Betta Splendens To Qualitatively Different Stimuli, Lauren Baard Jan 2006

Differential Habituation Of Male Betta Splendens To Qualitatively Different Stimuli, Lauren Baard

Undergraduate Research Symposium (UGRS)

Habituation is a learning mechanism that functions to decrease the amount of energy and attention focused on a certain stimuli. Male Siamese Fighting Fish, Betta splendens, are territorial animals that defend their territories using a number of aggressive displays. Male Bettas have previously shown the ability to habituate to the presence of a conspecific male when visually exposed to each other. Due to the costly nature of many of the male Betta’s displays, I hypothesized that male Bettas should differentially habituate to qualitatively different stimuli. I presented each of three groups of male Betta splendens with a different stimulus, each …

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Wet Corn Gluten Feed And Alfalfa Hay Levels In Dry-Rolled Corn Finishing Diets: Effects On Finishing Performance And Feedlot Nitrogen Mass Balance, T. B. Farran, Galen E. Erickson, Terry Klopfenstein, C. N. Macken, R. Lindquist Jan 2006

Wet Corn Gluten Feed And Alfalfa Hay Levels In Dry-Rolled Corn Finishing Diets: Effects On Finishing Performance And Feedlot Nitrogen Mass Balance, T. B. Farran, Galen E. Erickson, Terry Klopfenstein, C. N. Macken, R. Lindquist

Department of Animal Science: Faculty Publications

One-hundred ninety-two crossbred steers (initial BW= 351 ± 11 kg) were used to determine the effects of removing alfalfa hay (AH) from dry-rolled corn-based diets containing wet corn gluten feed (WCGF) on animal performance and nutrient (N and OM) mass balance in open feedlot pens. Steers were stratified by weight and assigned randomly to 24 pens (2 × 3 factorial) and fed for 132 d from June to October 2002. Experimental diets contained either 0 or 35% WCGF and 0, 3.75, or 7.5% AH, and were formulated to be isonitrogenous. For efficiency of gain, an interaction occurred (P = 0.09) …

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Evaluation Of Average Daily Gain Prediction By Level One Of The 1996 National Research Council Beef Model And Development Of Net Energy Adjusters, H. C. Block, Terry Klopfenstein, Galen E. Erickson Jan 2006

Evaluation Of Average Daily Gain Prediction By Level One Of The 1996 National Research Council Beef Model And Development Of Net Energy Adjusters, H. C. Block, Terry Klopfenstein, Galen E. Erickson

Department of Animal Science: Faculty Publications

Two data sets were developed to evaluate and refine feed energy predictions with the beef National Research Council (NRC, 1996) model level 1. The first data set included pen means of group-fed cattle from 31 growing trials (201 observations) and 17 finishing trials (154 observations) representing over 7,700 animals fed outside in dirt lots. The second data set consisted of 15 studies with individually fed cattle (916 observations) fed in a barn. In each data set, actual ADG was compared with ADG predicted with the NRC model level 1, assuming thermoneutral environmental conditions. Next, the observed ADG (kg), TDN intake …

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Comparison Of Feed Energy Costs Of Maintenance, Lean Deposition, And Fat Deposition In Three Lines Of Mice Selected For Heat Loss, D. L. Eggert, Merlyn K. Nielsen Jan 2006

Comparison Of Feed Energy Costs Of Maintenance, Lean Deposition, And Fat Deposition In Three Lines Of Mice Selected For Heat Loss, D. L. Eggert, Merlyn K. Nielsen

Department of Animal Science: Faculty Publications

Three replications of mouse selection populations for high heat loss (MH), low heat loss (ML), and a nonselected control (MC) were used to estimate the feed energy costs of maintenance and gain and to test whether selection had changed these costs. At 21 and 49 d of age, mice were weighed and subjected to dual x-ray densitometry measurement for prediction of body composition. At 21 d, mice were randomly assigned to an ad libitum, an 80% of ad libitum, or a 60% of ad libitum feeding group for 28-d collection of individual feed intake. Data were analyzed using 3 approaches. …

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Estimation Of Undegradable Intake Protein In Forages Using Neutral Detergent Insoluble Nitrogen At A Single In Situ Incubation Time Point, H. L. Haugen, M. J. Lamothe, Terry J. Klopfenstein, Don C. Adams, M. D. Ullerich Jan 2006

Estimation Of Undegradable Intake Protein In Forages Using Neutral Detergent Insoluble Nitrogen At A Single In Situ Incubation Time Point, H. L. Haugen, M. J. Lamothe, Terry J. Klopfenstein, Don C. Adams, M. D. Ullerich

Department of Animal Science: Faculty Publications

Two experiments were conducted to evaluate the use of neutral detergent insoluble nitrogen (NDIN) at a single in situ incubation time point to estimate the undegradable intake protein (UIP) in forages as well as to compare rates of NDIN degradation. Forage samples in Exp. 1 comprised diet samples collected from range and meadow pastures monthly from May through September. In Exp. 2, clipped samples of alfalfa, birdsfoot trefoil, kura clover, and smooth bromegrass, and diet samples of the mixed legume-grass and smooth bromegrass were evaluated. Forage samples were incubated in situ for their mean retention time (MRT) estimated from IVDMD …

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Determination Of Undegradable Intake Protein Digestibility Of Forages Using The Mobile Nylon Bag Technique, H. L. Haugen, S. K. Ivan, James C. Macdonald, Terry J. Klopfenstein Jan 2006

Determination Of Undegradable Intake Protein Digestibility Of Forages Using The Mobile Nylon Bag Technique, H. L. Haugen, S. K. Ivan, James C. Macdonald, Terry J. Klopfenstein

Department of Animal Science: Faculty Publications

Two experiments were conducted using 2 ruminally and duodenally fistulated steers to determine the digestibility of undegradable intake protein (UIP) of smooth bromegrass (Bromis inermis), birdsfoot trefoil (Lotus coniculatus L.), and heat-treated alfalfa (Medicago sativa) using the mobile nylon bag technique. Undegradable intake protein was determined using neutral detergent insoluble CP at a single in situ incubation time point based on 75% of the total mean retention time estimated from IVDMD plus a 10-h passage lag. In Exp. 1, UIP (% DM) of smooth bromegrass in June and July were 1.82 and 1.71, respectively (P …

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Heat Stress Risk Factors Of Feedlot Heifers, Tami M. Brown-Brandl, Roger A. Eigenberg, John Nienaber Jan 2006

Heat Stress Risk Factors Of Feedlot Heifers, Tami M. Brown-Brandl, Roger A. Eigenberg, John Nienaber

Department of Animal Science: Faculty Publications

Heat stress in cattle results in millions of dollars in lost revenue each year due to production losses, and in extreme cases, death. Death losses are more likely to result from animals vulnerable to heat stress. A study was conducted to determine risk factors for heat stress in feedlot heifers. Over two consecutive summers, a total of 256 feedlot heifers (32/ breed/ year) of four breeds were observed. As a measure of stress, respiration rates and panting scores were taken twice daily (morning and afternoon) on a random sample of 10 heifers/ breed. Weights, condition scores, and temperament scores were …

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Effects Of Growth-Promoting Agents And Season On Blood Metabolites And Body Temperature In Heifers, Terry L. Mader, W. M. Kreikemeier Jan 2006

Effects Of Growth-Promoting Agents And Season On Blood Metabolites And Body Temperature In Heifers, Terry L. Mader, W. M. Kreikemeier

Department of Animal Science: Faculty Publications

To assess the efficacy of growth-promoting agents among seasons, triiodothyronine (T3), thyroxine (T4), plasma urea nitrogen (PUN), IGF-I, and tympanic temperature (TT) were measured in summer and winter studies. Heifers (n = 9/pen) were allotted to 12 pens in both December and June. Pens were assigned to 1 of 6 growth promotant treatments: control (no growth promotant), estrogenic implant (E), trenbolone acetate implant (TBA), E + TBA (ET), melengestrol acetate (MGA), and ET + MGA (ETM). Blood samples were collected from 4 heifers per pen per study on d 0, 28, 56, and 84 via jugular …

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Technical Note: Estimating Statistical Power Of Mixed Models Used In Dairy Nutrition Experiments, Paul J. Kononoff, Kathryn J. Hanford Jan 2006

Technical Note: Estimating Statistical Power Of Mixed Models Used In Dairy Nutrition Experiments, Paul J. Kononoff, Kathryn J. Hanford

Department of Animal Science: Faculty Publications

Statistical power is defined as the probability of correctly rejecting the null hypothesis. Power calculations may be useful in planning experiments. The objective of this technical note is to outline an applied method that estimates statistical power of a dairy nutrition experiment that employs a Latin square as the experimental design. Because the SAS MIXED procedure (PROC MIXED) is commonly used to analyze data sets, this note outlines basic programming procedures that may be used to estimate statistical power of a mixed model using this procedure.

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The Cost Of Corn Processing For Finishing Cattle, C. N. Macken, G. E. Erickson, T. J. Klopfenstein Jan 2006

The Cost Of Corn Processing For Finishing Cattle, C. N. Macken, G. E. Erickson, T. J. Klopfenstein

Department of Animal Science: Faculty Publications

Three corn processing methods were compared for use in 5,000- and 20,000-head capacity feedlots. Processing methods were dry-rolled (DRC), early harvest and ensiling high-moisture (HMC), and steam-flaked corn (SFC). Processing costs were determined to be $1.58, $4.71, and $9.57/t (metric ton; DM basis) for DRC, HMC, and SFC, respectively, for the 5,000-capacity feedlot. Processing costs were less for the 20,000-capacity feedlot at $0.81, $3.07, and $6.23/t (DM basis) for DRC, HMC, and SFC, respectively. Using these economic calculations in an 85% corn diet (DM basis), an improvement of dietary feed efficiency would need to be 2.4 and 6.1% for feeding …

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Characterization Of 35 Microsatellite Loci In The Pacific Lion-Paw Scallop (Nodipecten Subnodosus) And Their Cross-Species Amplification In Four Other Scallops Of The Pectinidae Family, Ana M. Ibarra, Jessica Lynn Petersen, Thomas R. Famula, Bernie May Jan 2006

Characterization Of 35 Microsatellite Loci In The Pacific Lion-Paw Scallop (Nodipecten Subnodosus) And Their Cross-Species Amplification In Four Other Scallops Of The Pectinidae Family, Ana M. Ibarra, Jessica Lynn Petersen, Thomas R. Famula, Bernie May

Department of Animal Science: Faculty Publications

Four microsatellite-enriched DNA libraries yielded 35 microsatellite loci from 100 primer pairs designed for Pacific lion-paw scallop, Nodipecten subnodosus. The number of alleles ranged from four to 28. Three of the 35 loci were not in Hardy–Weinberg equilibrium and linkage disequilibrium was found for one pair of loci. These microsatellites will be used to analyze the population structure of the species in Mexico’s Baja Peninsula to propose management strategies for scallop aquaculture development. Twenty-six primer pairs cross-amplified in Nodipecten nodosus, whereas none (Argopecten ventricosus) or few cross-amplified in the Argopecten species.

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