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2003

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Articles 241 - 270 of 605

Full-Text Articles in Animal Sciences

Dna Sequence Of Melanocortin 1-Receptor Gene In Coturnix Japonica: Correlation With Three E Locus Alleles, E, E+, Erh, Rupali B. Ugrankar Jan 2003

Dna Sequence Of Melanocortin 1-Receptor Gene In Coturnix Japonica: Correlation With Three E Locus Alleles, E, E+, Erh, Rupali B. Ugrankar

Inquiry: The University of Arkansas Undergraduate Research Journal

The melanocortin 1-receptor (MC1-R) gene plays a key role in the expression of fur and feather color in mammals and birds by regulating the distribution of two melanin pigments: eumelanin (black/brown) and pheomelanin (red/yellow). MC1-R corresponds to the classical Extension (E) locus in mice, pigs, dogs, horses, and chickens. Three E locus alleles, the wild-type (e + ), brown (E), and redhead (e rh) have been identified in Japanese quail (Coturnix japonica). To determine if the quail E locus phenotypes were due to variation in the MC1-R gene, the coding region of the MC1-R gene was PCR amplified and DNA …

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Varriation Of Growth Rates In Yellow-Bellied Marmots, Carmen M. Salsbury, K. B. Armitage Jan 2003

Varriation Of Growth Rates In Yellow-Bellied Marmots, Carmen M. Salsbury, K. B. Armitage

Scholarship and Professional Work - LAS

Growth rates of yellow-bellied marmot (Marmota flaviventris) populations over a 32-year period (1965 -1996) varied Significantly with sex, age, location, and year. Overall, males had higher growth rates than females and young and yearlings generally had higher growth rates compared to adults at all locations. The locations varied with respect to elevation and the relationship between elevation and growth rate was complex and likely weather dependent. Low rainfall in late summer was often associated with low growth rates at high elevations where the active season is constrained and delayed by late spring snowmelt compared to low elevations. Growth rates and …

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Seasonal Body Temperature Fluctuations And Energetic Strategies In Free-Ranging Eastern Woodchucks, Carmen M. Salsbury Jan 2003

Seasonal Body Temperature Fluctuations And Energetic Strategies In Free-Ranging Eastern Woodchucks, Carmen M. Salsbury

Scholarship and Professional Work - LAS

During a 2-year period, radiotelemetry was used to continuously monitor body temperature ( T b) of free-ranging woodchucks (Marmota monax) in southeastern Pennsylvania. Hibernation was preceded by daily T b fluctuations ("test drops") of 2-4°C. During hibernation, woodchucks exhibited the characteristic pattern of torpor bouts. Time of arousals occurred randomly, but onset of torpor occurred predominantly between 1800 and 0000 h. Males had shorter hibernation periods (mean of 104.8 days) than did females (121.8 days). Males had shorter torpor bouts, but euthermic bouts were the same length as in females. Males also maintained higher T b during torpor. Overall, the …

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Relationships Of Chute-Side Measurements To Carcass Measurements, James C. Macdonald, Terry J. Klopfenstein, Galen E. Erickson, Casey Macken, Jeffrey Folmer Jan 2003

Relationships Of Chute-Side Measurements To Carcass Measurements, James C. Macdonald, Terry J. Klopfenstein, Galen E. Erickson, Casey Macken, Jeffrey Folmer

Nebraska Beef Cattle Reports

Three data sets were compiled to determine the relationship of weight, performance, hip height and ultrasound-measured fat thickness to hot carcass weight and fat thickness. Weight is generally the best predictor of relative differences in carcass weight at any time in the production system. Hip heights do not predict relative differences in carcass weight. Although the combination of hip height and weight is a more precise indicator of carcass weight than is hip height alone, generally this combination is inferior to weight alone. Only ultrasound-measured fat thickness predicted relative differences in fat thickness. Prediction of relative differences in carcass weight …

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Winter Ecology Of Kokanee: Implications For Salmon Management, G. B. Steinhart, Wayne A. Wurtsbaugh Jan 2003

Winter Ecology Of Kokanee: Implications For Salmon Management, G. B. Steinhart, Wayne A. Wurtsbaugh

Watershed Sciences Faculty Publications

We sampled various limnological parameters and measured growth and diet of age-0 kokanee Oncorhynchus nerka (lacustrine sockeye salmon) during two winters in a high-mountain lake of the Sawtooth Valley, Idaho. Although winter has been recognized as an important period for many warmwater fishes and for stream-dwelling salmonids, winter limitations have only recently been studied for coolwater and coldwater species. Ice and snow cover in winter limited light penetration. As a result, chlorophyll-a and zooplankton density were lower in ice-covered periods than during ice-free periods. The weight of stomach contents was often below a maintenance ration, yet the incidence of empty …

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2003 Beef Cattle Report Jan 2003

2003 Beef Cattle Report

Nebraska Beef Cattle Reports

Entire issue. 92 pages.

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Evaluation Of Cow And Calf Performance And Profit Potential In Beef Systems, Rosemary Anderson, Richard J. Rasby, Terry J. Klopfenstein, Casey Macken Jan 2003

Evaluation Of Cow And Calf Performance And Profit Potential In Beef Systems, Rosemary Anderson, Richard J. Rasby, Terry J. Klopfenstein, Casey Macken

Nebraska Beef Cattle Reports

A three-year experiment was conducted to determine the production efficiencies of two beef systems. Spring-calving, crossbred cows were either wintered on pasture (Control System) or on corn stalks (Treatment System). Control System steers were transported to a feedlot, fed a finishing diet and harvested. Treatment System steers were wintered on corn stalks, grazed pasture, fed a finishing diet, and harvested. Cow weights and condition differed but pregnancy rates were similar. Control System steers spent more days in the feedlot, had lower feed conversions and higher marbling scores. Treatment System steers had higher average daily gains and produced heavier carcasses.

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Ingredient Opportunities For Case-Ready Beef, Mike Baczwaski, Roger W. Mandigo Jan 2003

Ingredient Opportunities For Case-Ready Beef, Mike Baczwaski, Roger W. Mandigo

Nebraska Beef Cattle Reports

Case-ready beef products have grown at a tremendous rate since the early large scale introductions in the mid 1990’s. Estimates exceed 9 billion pieces in the near future, up from 500 million in 1997 and 1.2 billion in 2000. The key producers of case-ready beef products are fresh-meat processors and retailer co-packers and the list continues to grow rapidly. Justification for producers and consumers includes better-in-stock at retail or less out-of-stock on a 24-hour basis, labor availability at retail level, less shrink, greater cost savings, and most importantly consumer satisfaction, consistency, tenderness, juiciness and improved food safety.

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The Effects Of Tumbler Volume On Roasted Beef Quality, Mike Baczwaski, Roger W. Mandigo, Jesus Velazco Jan 2003

The Effects Of Tumbler Volume On Roasted Beef Quality, Mike Baczwaski, Roger W. Mandigo, Jesus Velazco

Nebraska Beef Cattle Reports

Semitendinosus beef muscles (n = 108) were used to determine optimum tumbler volume with regards to meat quality. Fill capacity of 2/3 meat had lower shear force values than capacities of 1/2 (P = 0.02) and 1/3 (P < 0 .01). Texture profile analysis showed favorable results among treatments. Hardness was lower with 2/3 capacity than 1/2 (P = 0.02) and 1/3 (P = 0.06). Gumminess favored 2/3 capacity over 1/2 (P = 0.02). Springiness favored 1/2 capacity over 1/3 capacity (P < 0.01) and 2/3 capacity (P=0.04). Purge, absorption rate during tumbling, absorption rate after rest, cooking loss and yield had no effect between treatments.

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Quality Traits Of Grain- And Grass-Fed Beef: A Review, Perry Brewer, Chris R. Calkins Jan 2003

Quality Traits Of Grain- And Grass-Fed Beef: A Review, Perry Brewer, Chris R. Calkins

Nebraska Beef Cattle Reports

Carcasses from grass-fed beef have lower fat thickness and lighter carcass weights, which increases the risk for cold shortening and reduces muscle proteolysis, both of which would reduce beef tenderness. A review of nine research papers indicates grass-fed beef is lower in tenderness (both from shear force and by taste panel), flavor and overall acceptability/desirability ratings.

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Carcass And Palatability Characteristics Of Calf-Fed And Yearling Finished Steers, Perry Brewer, Rosemary Anderson, Chris R. Calkins, Terry J. Klopfenstein, Richard J. Rasby Jan 2003

Carcass And Palatability Characteristics Of Calf-Fed And Yearling Finished Steers, Perry Brewer, Rosemary Anderson, Chris R. Calkins, Terry J. Klopfenstein, Richard J. Rasby

Nebraska Beef Cattle Reports

Steers finished in two management systems were used to compare carcass and palatability characteristics. Calves (n=34) were finished on a high concentrate diet for 203 days. Yearlings (n=42) grazed forages followed by 93 days on a high concentrate diet. Calves had higher marbling scores, lower shear force values and higher sensory ratings for tenderness, flavor and overall acceptability. Compared at equal marbling scores, calves had lower shear force values and higher sensory ratings for tenderness and overall acceptability. The risk of steaks being classified as “tough” was higher in yearlings, but relatively low, especially at extended aging times.

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Adjustments For Wind Speed And Solar Radiation To The Temperature-Humidity Index, Shane Davis, Terry L. Mader Jan 2003

Adjustments For Wind Speed And Solar Radiation To The Temperature-Humidity Index, Shane Davis, Terry L. Mader

Nebraska Beef Cattle Reports

Data from three separate feedlot finishing trials were combined into one data set to determine wind speed and solar radiation adjustments to the temperature- humidity index equation based on degree of panting and ambient environmental conditions. Regression equations were used to determine the relationship between observed panting and current temperature-humidity index, wind speed and solar radiation for developing correction factors. Based on these calculations, for each 1 mile/ hour increase in wind speed, THI should be decreased approximately 1 unit, and for each 3 Langley increase in solar radiation or 10% increase in cloud cover, THI should be decreased approximately …

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Carbon Sequestration Following Beef Cattle Feedlot Manure, Compost, And Fertilizer Applications, Bahman Eghball, Daniel Ginting Jan 2003

Carbon Sequestration Following Beef Cattle Feedlot Manure, Compost, And Fertilizer Applications, Bahman Eghball, Daniel Ginting

Nebraska Beef Cattle Reports

Manure or compost application can increase carbon (C) sequestration in the soil since these organic sources contain significant amounts of C, which is a major constituent of soil organic matter. An experiment was conducted from 1992 to 1996 to evaluate the effects of annual or biennial N- and P-based manure or composted manure application on soil C sequestration. Fertilized and unfertilized checks were also included. About 25% of applied manure C and 36% of applied compost C remained in the surface (0-6 inch) soil after four years of application, indicating greater C sequestration with composted than noncomposted manure. Soil C …

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Evaluation Of Buffering Agents In Feedlot Diets For Cattle, Travis Farran, Galen E. Erickson, Terry J. Klopfenstein Jan 2003

Evaluation Of Buffering Agents In Feedlot Diets For Cattle, Travis Farran, Galen E. Erickson, Terry J. Klopfenstein

Nebraska Beef Cattle Reports

Six ruminally cannulated heifers were used in a 6 x 6 Latin square to determine effects of Acid Buf, sodium bicarbonate and Rumensin on severity of acidosis and feeding behavior when fed to cattle consuming high grain finishing diets. Heifers received diets containing no added buffer, Acid Buf at 0.75% or 1.25% DM, sodium bicarbonate at 1.25% DM, 28 grams/ton Rumensin, or 28 grams/ton Rumensin + 0.75% DM Acid Buf. Heifers were adapted to dietary treatments 9 days before a 5-day data collection period. Animals fed Acid Buf and sodium bicarbonate had a higher average ruminal pH. Feeding Rumensin and …

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Intervention Strategies For Reduction Of E. Coli O157:H7 In Feedlot Steers, Jeffrey Folmer, Casey Macken, Galen E. Erickson, Terry J. Klopfenstein, Mindy Brashears, Rodney A. Moxley, David R. Smith, Suzanne Hinkley Jan 2003

Intervention Strategies For Reduction Of E. Coli O157:H7 In Feedlot Steers, Jeffrey Folmer, Casey Macken, Galen E. Erickson, Terry J. Klopfenstein, Mindy Brashears, Rodney A. Moxley, David R. Smith, Suzanne Hinkley

Nebraska Beef Cattle Reports

Two experiments were conducted to evaluate the effects of three intervention strategies on the prevalence of E. coli O157:H7 in feedlot steers. In both experiments, 432 steers were assigned to one of 54 pens. Intervention strategies were two competitive exclusion products, monthly pen cleaning. In Experiment 2 a diet change treatment was imposed prior to slaughter. No differences in performance or carcass yield were observed for the competitive exclusion products or the pen cleaning treatments, compared to the control. However, changing the finishing diet prior to slaughter decreased steer performance. We also observed a nonsignificant decrease in the prevalence of …

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Impact Of Manure Application On Phosphorus In Surface Runoff And Soil Erosion, Christina Gossin, Gregory J. Teichmeier, Galen E. Erickson, Terry J. Klopfenstein, Daniel T. Walters Jan 2003

Impact Of Manure Application On Phosphorus In Surface Runoff And Soil Erosion, Christina Gossin, Gregory J. Teichmeier, Galen E. Erickson, Terry J. Klopfenstein, Daniel T. Walters

Nebraska Beef Cattle Reports

Effects of method of manure management and dietary P were compared on 21 natural runoff plots to monitor the long-term impact of dietary P to P losses in runoff and erosion. Reducing feed P resulted in a 33% reduction in manure P content and soil test P buildup and runoff losses of P also were directly proportional to feed P inputs. The timing and management of manure are also important considerations for controlling P losses in runoff in the year of application. However, residual effects of timing and management are probably small. Management criteria designed to assess the potential for …

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Summer Vs. Winter Growth Promotant Strategies For Intact Yearling Heifers, Wanda Kreikemeier, Terry L. Mader Jan 2003

Summer Vs. Winter Growth Promotant Strategies For Intact Yearling Heifers, Wanda Kreikemeier, Terry L. Mader

Nebraska Beef Cattle Reports

A winter and a summer trial were conducted to evaluate growth promoting strategies among season for yearling heifers fed feedlot finishing diets. Two hundred seventy Angus crossbred intact yearling heifers were used for each trial. Daily dry matter intake and daily water intake were recorded and average daily gain and feed efficiency were calculated. A growth promotant by season interaction was found for dry matter intake only. Performance was improved in both summer and winter when a growth promoting system was used. In the summer, adding melengestrol acetate to estrogenic and androgenic implants strategies tended to stimulate DMI, while in …

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Feeding Kelp Meal In Feedlot Diets, Wanda Kreikemeier, Terry L. Mader, Shane Davis, Dan Colling Jan 2003

Feeding Kelp Meal In Feedlot Diets, Wanda Kreikemeier, Terry L. Mader, Shane Davis, Dan Colling

Nebraska Beef Cattle Reports

Three trials were conducted to assess the effects of feeding kelp meal to feedlot cattle. In Trial 1, two commercial feedlots were utilized to determine the effects of kelp meal fed to finishing steers exposed to heat stress. Trial 2 was conducted to evaluate the effects of feeding kelp meal in receiving feedlot steer diets. Trial 3 assessed the effects of kelp meal on performance and carcass characteristics when finishing feedlot heifers were exposed to heat stress. Panting scores were reduced in commercial pens of cattle fed kelp meal while dry matter intakes were maintained. Water intake and dry matter …

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Estimation Of Rumen Undegradable Protein In Forages By Using Neutral Detergent Insoluble Nitrogen At A Single In Situ Incubation Time Point, Mariela Lamothe, Terry J. Klopfenstein Jan 2003

Estimation Of Rumen Undegradable Protein In Forages By Using Neutral Detergent Insoluble Nitrogen At A Single In Situ Incubation Time Point, Mariela Lamothe, Terry J. Klopfenstein

Nebraska Beef Cattle Reports

Neutral detergent insoluble nitrogen (NDIN) was used as a direct estimate of UIP. Forage samples collected from upland range and subirrigated meadow sites over the summer were incubated in situ for a time equivalent to a mean retention time estimated from the digestibility of the forage plus 10 hour to account for a lag in passage of particles from the rumen. Samples also were incubated for 75% of the estimated total mean retention time. The UIP values obtained from the fractional rates of degradation and passage were highly correlated with those estimated from samples incubated for 75% of total mean …

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Microbial Protein Production In Gestating Cows Supplemented With Different Sources Of Rumen Degradable Protein Grazing Dormant Range, Mariela Lamothe, Terry J. Klopfenstein, Don C. Adams, Jacqueline A. Musgrave, Galen E. Erickson Jan 2003

Microbial Protein Production In Gestating Cows Supplemented With Different Sources Of Rumen Degradable Protein Grazing Dormant Range, Mariela Lamothe, Terry J. Klopfenstein, Don C. Adams, Jacqueline A. Musgrave, Galen E. Erickson

Nebraska Beef Cattle Reports

Twenty-four gestating spring calving cows grazing dormant native range were used to determine the effect of two different sources of DIP supplementation in the winter. Supplementation treatments were: 1) supplement containing urea as a source of non-protein nitrogen, 2) corn gluten feed (CGF) as a source of true protein, and 3) no supplement . Forage intake was greater for cows supplemented with urea compared to no supplement, and forage intake tended be greater for cows supplemented with urea than CGF. Microbial protein (MCP) synthesis estimated from urinary excretion of allantoin was greater for cows receiving urea than CGF or no …

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Value Of Dry Distillers Grains In High-Forage Diets And Effect Of Supplementation Frequency, Tim Loy, Terry J. Klopfenstein, Galen E. Erickson, Casey Macken Jan 2003

Value Of Dry Distillers Grains In High-Forage Diets And Effect Of Supplementation Frequency, Tim Loy, Terry J. Klopfenstein, Galen E. Erickson, Casey Macken

Nebraska Beef Cattle Reports

An experiment was conducted with 120 crossbred heifers to determine the value of dry distillers grains (DDG) in high-forage diets, and to evaluate the effect of supplementing daily compared to three times weekly. Heifers were fed to consume grass hay ad libitum and supplemented with DDG, dry rolled corn (DRC), or DRC with corn gluten meal (DRC+CGM). Supplements were fed at two levels and offered either daily or three times per week in equal proportions. Heifers supplemented daily ate more hay, gained faster (1.37 vs. 1.24 lb per day), but were not more efficient than those supplemented on alternate days. …

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Sorting Strategies For Yearlings, James C. Macdonald, Terry J. Klopfenstein, Galen E. Erickson, Casey Macken, Jeffrey Folmer, Mark Blackford Jan 2003

Sorting Strategies For Yearlings, James C. Macdonald, Terry J. Klopfenstein, Galen E. Erickson, Casey Macken, Jeffrey Folmer, Mark Blackford

Nebraska Beef Cattle Reports

One hundred sixty medium-framed English-cross steers were used in each year of a two-year study to determine effects of three sorting strategies on performance, carcass characteristics and profitability in an extensive beef production system. Sorting by weight before the grazing period or entering the feedlot decreased variation in carcass weight. Sorting by weight before the grazing period increased marbling scores and resulted in significantly higher premiums. However, no sorting strategy significantly increased carcass weight or improved profitability.

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Amino Acid Supplementation To Growing Heifers Fed Soypass®, James C. Macdonald, Terry J. Klopfenstein, Casey Macken Jan 2003

Amino Acid Supplementation To Growing Heifers Fed Soypass®, James C. Macdonald, Terry J. Klopfenstein, Casey Macken

Nebraska Beef Cattle Reports

Sixty individually fed heifers were used in an 84-day growing trial to determine effects of adding rumen protected methionine and/or bloodmeal on performance of growing heifers supplemented with Soypass®. Treatments were designed to be a 2x2 factorial with diets supplemented with or without rumen protected methionine and bloodmeal (0.3% of DM) to provide 0.72 g per day of additional histidine as factors. The rumen protected methionine source, Smartamine M®, provided 1.85 g per day of additional methionine. No statistical differences in performance among treatments were observed, suggesting growing animals fed Soypass® do not benefit from addition of supplemental rumen protected …

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Corn Steep And Bran:Germ Meal Ratio In Steam-Flaked Corn Based Finishing Diets, Casey Macken, Galen E. Erickson, Terry J. Klopfenstein, Rob Cooper, Rick Stock Jan 2003

Corn Steep And Bran:Germ Meal Ratio In Steam-Flaked Corn Based Finishing Diets, Casey Macken, Galen E. Erickson, Terry J. Klopfenstein, Rob Cooper, Rick Stock

Nebraska Beef Cattle Reports

A finishing trial was conducted to evaluate corn steep:bran/germ meal combinations in steam-flaked based diets. Feed efficiency improved in a linear fashion as steep level increased. Feed efficiency was similar between cattle that received no byproducts compared with cattle fed 25% corn byproducts that contained 50% steep. Feed efficiency was decreased for levels of 37.5, 41.7, and 45.8% steep compared to no byproduct or 50% steep. Daily gain was similar among treatments.

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Wet Corn Gluten Feed Levels For Steam-Flaked Corn Based Finishing Diets, Casey Macken, Galen E. Erickson, Terry J. Klopfenstein, Rob Cooper, Rick Stock Jan 2003

Wet Corn Gluten Feed Levels For Steam-Flaked Corn Based Finishing Diets, Casey Macken, Galen E. Erickson, Terry J. Klopfenstein, Rob Cooper, Rick Stock

Nebraska Beef Cattle Reports

A finishing trial was conducted to evaluate level of wet corn gluten feed in steam-flaked corn based finishing diets. Feed efficiency and daily gain were similar among all levels (10, 20, 25, 30, and 35%, DM basis) of inclusion of Sweet Bran® wet corn gluten feed evaluated in this trial. These data indicate wet corn gluten feed is similar in energy content to steam-flaked corn based on animal performance.

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Body Temperature Changes Associated With Moving Feedlot Cattle, Terry L. Mader Jan 2003

Body Temperature Changes Associated With Moving Feedlot Cattle, Terry L. Mader

Nebraska Beef Cattle Reports

In two winter and two summer studies, tympanic temperatures (TT), an indicator of body temperature, were obtained in unrestrained feedlot cattle moved through working facilities. Moving yearling cattle elevated TT between 0.5 and 1.4°F. Effects of cattle movement and handling on body temperature needs to be taken into account when evaluating animal health studies. Furthermore, minimal handling of cattle during hot days is recommended for promoting animal well-being and comfort.

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Influence Of Rinsing Technique And Sample Size On In Situ Protein Degradation, Kimberly Whittet, Kelly Creighton, Kyle Vander Pol, Galen E. Erickson, Terry J. Klopfenstein Jan 2003

Influence Of Rinsing Technique And Sample Size On In Situ Protein Degradation, Kimberly Whittet, Kelly Creighton, Kyle Vander Pol, Galen E. Erickson, Terry J. Klopfenstein

Nebraska Beef Cattle Reports

Four experiments were conducted to evaluate effects of in situ bag rinsing technique and sample size on the variation of undegradable intake protein (UIP) and dry matter disappearance (DMD) of soybean meal (SBM) and Soypass, a heat-treated soybean meal. Five rinsing techniques and five sample sizes were used to test effects. Soybean meal had higher DMD, lower UIP and higher variance for UIP than Soypass. A steer difference was noted for experiments with steer as a replication and also contributed a larger effect than day and run within day. Rinsing technique and sample size were not significant in concentrate fed …

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Effects Of Grazing Corn Stalks In The Spring On Subsequent Crop Yields, Casey Wilson, Galen E. Erickson, Terry J. Klopfenstein, Walter Luedtke Jan 2003

Effects Of Grazing Corn Stalks In The Spring On Subsequent Crop Yields, Casey Wilson, Galen E. Erickson, Terry J. Klopfenstein, Walter Luedtke

Nebraska Beef Cattle Reports

Two studies evaluated impact of grazing corn residue during the spring on subsequent soybean yields in a corn-soybean rotation. Each study was conducted for two consecutive years. Tillage treatments consisting of ridge-till, fall till, spring-till, and no-till were also evaluated to determine if yields could be maintained by alleviating compaction from grazing in the spring. No significant differences in yield with tillage treatment and grazing were observed. Grazing treatments overall increased soybean yields in both studies. In the second study only a depression in subsequent corn yield was noted with spring grazing at stocking rate of .32 acres/calf for 60 …

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Utilization Of Genetically Enhanced Corn Residue On Grazing Steer Performance, Casey Wilson, Casey Macken, Casey Macken, Galen E. Erickson, Terry J. Klopfenstein, Edward Stanisiewski Jan 2003

Utilization Of Genetically Enhanced Corn Residue On Grazing Steer Performance, Casey Wilson, Casey Macken, Casey Macken, Galen E. Erickson, Terry J. Klopfenstein, Edward Stanisiewski

Nebraska Beef Cattle Reports

Two studies were conducted to evaluate the efficacy of transgenic corn hybrids for residue grazing. In Experiment 1 two irrigated corn fields were used after grain harvest, one Roundup Ready® and it’s non-transgenic control line to evaluate grazing performance. This experiment was terminated after 35 days due to excessive snow cover. There was no significant difference in performance in Experiment 1. Experiment 2 was conducted the following year using dryland corn. In Experiment 2 corn root worm protected variety (Bt), Roundup Ready®, and their non-transgenic control line were evaluated. No differences in animal performance were observed between either genetically enhanced …

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Microbial Protein Synthesis And Efficiency In Nursing Calves, Mariela Lamothe, Terry J. Klopfenstein, Don C. Adams, Jacqueline A. Musgrave, Galen E. Erickson Jan 2003

Microbial Protein Synthesis And Efficiency In Nursing Calves, Mariela Lamothe, Terry J. Klopfenstein, Don C. Adams, Jacqueline A. Musgrave, Galen E. Erickson

Nebraska Beef Cattle Reports

Microbial protein synthesis and efficiency were estimated in springborn nursing calves grazing native range and subirrigated meadow. Forage intake increased from 1.5 lb/ day (0.6% BW) in June to 5.9 lb/day (1.2% BW) in September while milk intake decreased over the same period. Microbial protein (MCP) synthesis increased from 67 g/day in May to 278 g/day right before weaning in September. Urinary allantoin was used as a marker. Efficiency of MCP synthesis was approximately 19% of forage digestible organic matter (OM) intake.

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