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Animal Sciences Commons

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2005

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Articles 271 - 300 of 835

Full-Text Articles in Animal Sciences

Ecological Analysis Of Nutrient, Plankton And Benthic Communities In Farmington Bay And The Great Salt Lake, Utah (2004), Amy M. Marcarelli, Wayne A. Wurtsbaugh Feb 2005

Ecological Analysis Of Nutrient, Plankton And Benthic Communities In Farmington Bay And The Great Salt Lake, Utah (2004), Amy M. Marcarelli, Wayne A. Wurtsbaugh

Watershed Sciences Faculty Publications

In Fall 2004, the Aquatic Ecology Practicum class at Utah State University finished a third year of research on limnological and ecological characteristics of Farmington Bay and Gilbert Bays of the Great Salt Lake. Our previous research has produced interesting findings in Farmington Bay, including hypereutrophy (Marcarelli et a!. 2001), high phosphorus loading into the Bay, overnight water column anoxia linked to high winds (Wurtsbaugh et a!. 2002), potential predator control of brine shrimp, and high levels of hydrogen sulfide in the sediment and deep brine layer (Marcarelli et a!. 2003). These class findings have lead to increased interest in …


Predicting Numbers Of Hauled-Out Harbour Seals: A Mathematical Model, James L. Hayward, Shandelle M. Henson, Clara J. Logan, Catherine R. Parris, Matthew W. Meyer, Brian Dennis Feb 2005

Predicting Numbers Of Hauled-Out Harbour Seals: A Mathematical Model, James L. Hayward, Shandelle M. Henson, Clara J. Logan, Catherine R. Parris, Matthew W. Meyer, Brian Dennis

Faculty Publications

1. It was once assumed that commercially important fish make up significant portions of seal diets. As a consequence, prior to the 1970s many seal populations were dramatically reduced by rampant slaughtering. Today, seals and other marine mammals are valued components of marine ecosystems and their numbers are carefully managed. To facilitate management, government statutes mandate the systematic monitoring of seal populations. Population estimates are based on counts of hauled-out seals obtained by aerial survey and radio and satellite telemetry; hence, considerable effort has been devoted to finding optimal times for such counts. We have developed a predictive mathematical model …


Code Of Practice For The Use Of Agricultural And Veterinary Chemicals In Western Australia, Peter Rutherford Feb 2005

Code Of Practice For The Use Of Agricultural And Veterinary Chemicals In Western Australia, Peter Rutherford

Bulletins 4000 -

Agricultural and veterinary chemicals are a critically important input to modern farming systems. There is, however an increasing responsibility on the spray operator and his supervisor to use them with utmost safety. An effective way of providing the “rules” of safe chemical use is through a Code of Practice, the concept of which arose because of the increase in new and emerging agricultural industries and their impact on traditional uses of agricultural chemicals.


Ponazuril Inhibits The Development Of Eimeria Vermiformis In Experimentally Infected Outbred Swiss Mice, S. A. Billeter, J. A. Spencer, Bill Chobotar, B. L. Blagburn Feb 2005

Ponazuril Inhibits The Development Of Eimeria Vermiformis In Experimentally Infected Outbred Swiss Mice, S. A. Billeter, J. A. Spencer, Bill Chobotar, B. L. Blagburn

Faculty Publications

We evaluated a 15% paste formulation of ponazuril in outbred Swiss mice that were experimentally infected with Eimeria vermiformis. Thirty, 8-week-old female mice (approximately 20 g) were placed in one group of 10 mice and one group of 20 mice. Mice in both groups were gavaged with approximately 5,000 sporulated oocysts of E. vermiformis on day 0. Mice in group 2 (n=10) were treated orally on days 3 and 4 with ponazuril (suspended in 30% propylene glycol) at the rate of 20 mg/kg. Mice in group 1 (n=20) were gavaged with a similar volume of 30% propylene glycol. Rates of …


Effect Of Using Cidrs For Seven Days Before The Introduction Of Bulls On The Proportion Of Cows Conceiving Early In The Breeding Season, George A. Perry Jan 2005

Effect Of Using Cidrs For Seven Days Before The Introduction Of Bulls On The Proportion Of Cows Conceiving Early In The Breeding Season, George A. Perry

South Dakota Beef Report, 2005

Cows that conceive earlier in the breeding season wean calves that are older and heavier at weaning. Therefore, the objective of this study was to determine the ability of a CIDR to increase the proportion of cows that conceived early during a natural service breeding season. Two hundred twenty-two postpartum beef cows were allotted to one of two treatments: 1) cows were treated with a CIDR for 7 days before bulls were introduced (n = 100), 2) cows were not treated and served as a control (n = 122). Seven days before bulls were introduced to the herd CIDRs were …


Comparison Of The Efficiency And Accuracy Of Three Estrous Detection Methods To Indicate Ovulation In Beef Cattle, George A. Perry Jan 2005

Comparison Of The Efficiency And Accuracy Of Three Estrous Detection Methods To Indicate Ovulation In Beef Cattle, George A. Perry

South Dakota Beef Report, 2005

The ability to successfully artificially inseminate cattle requires determining the appropriate time to inseminate. Therefore, detection of standing estrus is a major factor in the success or failure of most artificial insemination programs. The objective of these experiments was to determine the efficiency and accuracy of three estrous detection methods (visual, penile deviated bull, and Estrus Alert estrous detection aids) to determine if animals were going to ovulate. Fifty-three postpartum beef cows were synchronized with an injection of gonadotropin releasing hormone (GnRH) followed by an injection of prostaglandin F2_ (PG) seven days later. Estrus was monitored for 72 hours following …


Spring Drought Effects On Rangeland Forage Yield From Clayey Ecological Sites In Western South Dakota, Alexander J. Smart, Roger N. Gates, Barry H. Dunn Jan 2005

Spring Drought Effects On Rangeland Forage Yield From Clayey Ecological Sites In Western South Dakota, Alexander J. Smart, Roger N. Gates, Barry H. Dunn

South Dakota Beef Report, 2005

Understanding the historical influence of seasonal precipitation, especially spring precipitation, and stocking rate on forage yield would be desirable for planning purposes. The objectives of this study were to examine the historical precipitation pattern and how it influenced forage yield on pastures that were stocked at light, moderate, and heavy stocking rates for 15 years at the Cottonwood Range and Livestock Research Station in western South Dakota. Weather data from 1909 to 2004 at the station were analyzed to determine the frequency of occurrence of below (≤75 of mean), normal, and above normal (>125% of mean) spring precipitation (April, …


Sod Suppression Techniques For Legume Interseeding, Alexander J. Smart, Vance N. Owens, Dick Pruitt Jan 2005

Sod Suppression Techniques For Legume Interseeding, Alexander J. Smart, Vance N. Owens, Dick Pruitt

South Dakota Beef Report, 2005

Sod suppression is necessary for successful establishment of legumes interseeded into existing pasture; however such techniques vary in their effectiveness, cost, and management. Sod suppression experiments for legume interseeding into cool-season pasture were conducted at South Dakota State University’s Cow-Calf Unit located near Brookings, SD in 2003 to 2005. We evaluated (i) spring burn, (ii) field cultivator or disk, (iii) herbicide, (iv) heavy fall and spring graze, and (v) a control with no sod suppression. Legume species were alfalfa, birdsfoot trefoil, and kura clover. Sod suppression techniques enhanced the success of legume interseeding. In this study, the grazing equaled or …


Effect Of Grazing, Mowing, Or Herbicide On Leafy Spurge Control, Kelly W. Bruns, Alexander J. Smart Jan 2005

Effect Of Grazing, Mowing, Or Herbicide On Leafy Spurge Control, Kelly W. Bruns, Alexander J. Smart

South Dakota Beef Report, 2005

Leafy spurge (euphorbia esula L.) is an herbaceous perennial which is deep rooted and can reproduce by seeds and rhizomes. First introduced into North America in the 1800’s from Europe, it now covers 25 states in the USA and several provinces in Canada. It is a major concern in North Dakota, South Dakota, Wyoming, Montana, and Nebraska. Leafy spurge is considered a noxious weed that is extremely competitive, establishing itself in pastureland and roadsides. Bangsund et al. (1997) estimated that by 2005, uncontrolled leafy spurge acres would reach 18.5 million in the Northern Great Plains. The cost of leafy spurge …


Intravenous Ghrelin Infusion Affects Plasma Growth Hormone Concentrations, Dry Matter Disappearance, And Length Of Time Spent Feeding, Aimee E. Wertz-Lutz, Robbi H. Pritchard, Joseph A. Daniel, Jeff A. Clapper Jan 2005

Intravenous Ghrelin Infusion Affects Plasma Growth Hormone Concentrations, Dry Matter Disappearance, And Length Of Time Spent Feeding, Aimee E. Wertz-Lutz, Robbi H. Pritchard, Joseph A. Daniel, Jeff A. Clapper

South Dakota Beef Report, 2005

Six steers (915 ± 37.8 kg) were used in a crossover design to determine the effects of intravenous infusion of bovine ghrelin (BGR) on plasma growth hormone (GH) concentrations, length of time spent feeding, and dry matter disappearance per unit of metabolic weight. Steers were fed individually once daily (0800 h) and allowed to consume ad libitum until 2000 h when feed was removed. Daily feed allotment was sufficient to result in ≥ 10% feed refusal. Serial blood samples were collected from steers fitted with an indwelling jugular catheter at 15-min intervals from 0600 h through 1800 h. Harvested plasma …


Effect Of Feeding Schedule On Tympanic Temperature Of Steer Calves During Winter, Simone M. Holt, Robbi H. Pritchard Jan 2005

Effect Of Feeding Schedule On Tympanic Temperature Of Steer Calves During Winter, Simone M. Holt, Robbi H. Pritchard

South Dakota Beef Report, 2005

Angus steer calves (n=135) were used in a 55d feedlot growing study to investigate the effects of feeding schedule on tympanic temperature response when limit feeding. Steers were fed a high moisture ear corn diet (58 Mcal/cwt NEg) at 0900h (AM), 1500h (PM) or 50% at 0900h and 50% at 1500h (SPLIT) to allow for 2.50lb ADG. Climatic data were collected at 30 min intervals throughout the study via an on site automated weather station. Tympanic temperatures (TT) were collected every 30 min (5 steers/trt) for 5d (d44 to d48). Mean ambient temperature during the 5d TT collection period was …


Effect Of High-Sulfate Water On Trace Mineral Status Of Beef Steers, Cody L. Wright, Hubert H. Patterson Jan 2005

Effect Of High-Sulfate Water On Trace Mineral Status Of Beef Steers, Cody L. Wright, Hubert H. Patterson

South Dakota Beef Report, 2005

Two experiments were conducted to determine the effect of high-sulfate water on the performance, health, and mineral status of growing steers. The first experiment was conducted from June 20 to September 12, 2001, at the South Dakota State University (SDSU) Cottonwood Range and Livestock Research Station. Eighty-one crossbred steers (initial BW = 700 lb) were stratified by weight and randomly assigned to 12 dry-lot pens (6 or 7 steers/pen). Pens were then randomly assigned to one of three water quality treatments: 1) rural water (404 ppm sulfate), 2) well water (3087 ppm sulfate), and 3) stock dam water (3947ppm sulfate). …


Relative Efficiency Of Natural Feeding Programs Using Germ Or Bran Cake From A Dry Milling Process, Robbi H. Pritchard, Donald L. Boggs Jan 2005

Relative Efficiency Of Natural Feeding Programs Using Germ Or Bran Cake From A Dry Milling Process, Robbi H. Pritchard, Donald L. Boggs

South Dakota Beef Report, 2005

This experiment was designed to evaluate the potential of using high-fat ethanol co-products in cattle feeding programs that exclude implants and ionophores. Four treatments included: 1) Positive Control, implanted steers fed a typical diet that included 29g/T monensin; 2) Control Diet fed to non-implanted steers; 3) 14% Germ, no implant or ionophore; and 4) 30% Bran Cake, no implant, no ionophore. After a 110 d finishing period, the breakeven (B/E) fed cattle price increased $3.04/cwt when an implant was not used on the Control diet. The Germ diet resulted in comparable performance as the Control diet fed to non-implanted steers. …


Composition And Nutritive Value Of Corn Fractions And Ethanol Co-Products Resulting From A New Dry-Milling Process, Greg B. Kleinhans, Robbi H. Pritchard, Simone M. Holt Jan 2005

Composition And Nutritive Value Of Corn Fractions And Ethanol Co-Products Resulting From A New Dry-Milling Process, Greg B. Kleinhans, Robbi H. Pritchard, Simone M. Holt

South Dakota Beef Report, 2005

The development of a new dry-milling process for the production of corn ethanol has resulted in new feedstuffs. This process fractionates the corn kernel prior to fermentation. Pre-fermentation fractions include bran, germ, and endosperm. Post-fermentation fractions include dried distillers grains (DDG) and condensed distiller solubles (syrup). Proximate analysis was conducted on these fractions along with the parent corn sample. Equations were used to predict TDN and undegradable intake protein (UIP). These feeds differ substantially from historical dried distiller’s grains with solubles (DDGS). Feeding experiments will be necessary to confirm the results of the predicted feed values.


Corn Germ As A Source Of Supplemental Fat For Cows In Late Gestation, Dick Pruitt, Jeff A. Clapper, William B. Epperson, George A. Perry Jan 2005

Corn Germ As A Source Of Supplemental Fat For Cows In Late Gestation, Dick Pruitt, Jeff A. Clapper, William B. Epperson, George A. Perry

South Dakota Beef Report, 2005

To evaluate corn germ as a source of supplemental fat, 217 two to twelve-year-old cows receiving grass hay free choice were supplemented with either 2.75 lb of corn germ (dry basis) or an equal amount of crude protein from soybean meal (0.80 lb dry matter) starting approximately 50 days prior to the first expected calving. Cows were removed from treatment the day they calved and where managed as a group through the breeding season. Supplement treatment did not affect cow weight change or body condition score. Corn germ did not improve any measure of reproduction, including the percentage of cows …


Effect Of Harvest Method On The Nutrient Composition Of Baled Cornstalks, Cody L. Wright Jan 2005

Effect Of Harvest Method On The Nutrient Composition Of Baled Cornstalks, Cody L. Wright

South Dakota Beef Report, 2005

This experiment was conducted to determine the effect of chopping corn residue prior to baling on the nutrient composition of cornstalk bales. One dryland corn field planted with a single variety of corn was used. After harvest, one half of the field was chopped with a stalk chopper. The remaining half was not chopped. Each half of the field was then raked into windrows, baled, and wrapped with plastic netting. Ten round bales were harvested from each half of the field (chopped and not chopped). Three core samples were then collected from each bale and pooled for analysis. Pooled samples …


Factors Affecting Profitability Of The Cow-Calf Enterprise In The Northern Great Plains, Barry H. Dunn, Dick Pruitt, Edward Hamilton, Duane Griffith Jan 2005

Factors Affecting Profitability Of The Cow-Calf Enterprise In The Northern Great Plains, Barry H. Dunn, Dick Pruitt, Edward Hamilton, Duane Griffith

South Dakota Beef Report, 2005

One hundred and forty eight privately owned and operated cow-calf enterprises were surveyed for their production and financial performance measures and the results analyzed for factors that affected profitability. The results of these analyzes indicate that for cow-calf enterprises in the Northern Great Plains, high levels of profit are a function of lower than average investment, above average reproductive performance, lower than average total expenses, and above average market prices for calves produced. Neither high nor low levels of other biological production, geographical region, size of operation, or year were factors that explained differences in profitability. Profitability measured as Return …


Use Of Corn Co-Products In Soybean Hull-Based Feedlot Receiving Diets, Chad J. Mueller, Donald L. Boggs Jan 2005

Use Of Corn Co-Products In Soybean Hull-Based Feedlot Receiving Diets, Chad J. Mueller, Donald L. Boggs

South Dakota Beef Report, 2005

The use of different supplemental protein sources with soybean hulls in receiving cattle diets were evaluated using 200 Angus steer calves. Diets contained either corn and soybean meal (C-SBM), or soybean hulls with soybean meal (H-SBM), dried corn gluten feed (H-DCGF) or dried distillers grains plus solubles (H-DDGS). The replacement of corn (C-SBM) with soybean hulls (H-SBM) stimulated intake within the first 14 d of the receiving period and throughout the entire growing period (52 d). Supplementing soybean hulls with corn origin protein (COP) versus soybean meal did not result in any performance differences throughout the feeding period. Within the …


Influence Of Calcium Metabolism On Meat Tenderness In Heiferettes, Kelly W. Bruns, Robbi H. Pritchard Jan 2005

Influence Of Calcium Metabolism On Meat Tenderness In Heiferettes, Kelly W. Bruns, Robbi H. Pritchard

South Dakota Beef Report, 2005

Forty beef-type heiferettes (initial BW=1016 ± 93 lb) were used to evaluate the influence of dietary calcium depletion followed by dietary repletion prior to slaughter on carcass and meat quality traits. Treatments were 1.) control - feed calcium diet for duration of trial (13 hd); 2.) calcium depleted 14 days followed by one feeding of replete diet 20 h prior to slaughter (13 hd); 3.) calcium depleted 14 days followed by two feedings of repleted diet 20 h and 44 h before harvest (14 hd). Heifers were sorted on condition and weight from a larger population of 280 head. Heiferettes …


Comparative Anatomy Of A Presorted Pot-Load Of Yearling Steers, Kelly W. Bruns, Robbi H. Pritchard, Simone Holt Jan 2005

Comparative Anatomy Of A Presorted Pot-Load Of Yearling Steers, Kelly W. Bruns, Robbi H. Pritchard, Simone Holt

South Dakota Beef Report, 2005

One load (n = 72; initial BW = 745 ± 54.5) of grass-raised Angus-cross yearling steers was purchased from a sale barn in north central South Dakota. The steers were sorted into load lots by sale barn personnel from a larger group of 1200. Upon arrival, steers were used in the 4-day Feedlot Shortcourse before being weighed and appraised for visual differences. Cattle were divided (randomly) into 8 groups of 9 head each. One steer was randomly selected from each of the eight groups to make a 9th group of steers comprised of each classification. The steers were fed until …


Fenceline Weaning On Pasture And Forage Barley To Extend The Grazing Season For Replacement Heifers - A Three-Year Summary, Dick Pruitt, William Epperson, Vance Owens, Alexander Smart Jan 2005

Fenceline Weaning On Pasture And Forage Barley To Extend The Grazing Season For Replacement Heifers - A Three-Year Summary, Dick Pruitt, William Epperson, Vance Owens, Alexander Smart

South Dakota Beef Report, 2005

In a three-year study at the SDSU Cow/Calf Teaching and Research Unit, Brookings, SD, heifer calves were allotted to two weaning management treatments in early October. The pasture-weaned group was separated from their dams and grazed a grass pasture across the fence from their dams for two weeks. Then, until early December, they grazed “Robust” barley (forage type) that had been no-till planted into oat stubble in early August. The drylot-weaned group was fed a traditional weaning diet of grass hay, corn and protein supplement from weaning until early December. Heifers received the same diet and were managed as one …


Improved Pasture Systems Make Sense... And Dollars Too!, Jason Tower Jan 2005

Improved Pasture Systems Make Sense... And Dollars Too!, Jason Tower

Forage Symposium at the Kentucky Cattlemen’s Convention

Talk to most any beef producer and he can tell you the facts of his beef operation. Many cattlemen can go back three or four generation on a cow’s pedigree. He can tell you what bull was used on the farm for each of the last ten years. More than likely he can tell you the number of calves he weaned last year. He can tell you the average weight of those calves and if he topped the market, there is no doubt you will soon learn what price he received for the calves. Ask this cattleman what it cost …


Corn As A Grazing Crop: An Option For Extending The Grazing Season In Kentucky, David C. Ditsch, John T. Johns, Steven G. Isaacs, Tyler B. Mark, C. D. Lee Jan 2005

Corn As A Grazing Crop: An Option For Extending The Grazing Season In Kentucky, David C. Ditsch, John T. Johns, Steven G. Isaacs, Tyler B. Mark, C. D. Lee

Forage Symposium at the Kentucky Cattlemen’s Convention

Grazing is the cheapest way to feed cattle on a cost per pound of nutrient basis. However, producers with limited land resources in Kentucky have been able to use commodities or grain by-products to increase cattle numbers due to low cost and availability of these inputs. Extending the grazing season is one solution that would enable producers to reduce cost and expand production with little or no impact on the environment.


Forage Quality--Back To Basics, Garry D. Lacefield Jan 2005

Forage Quality--Back To Basics, Garry D. Lacefield

Forage Symposium at the Kentucky Cattlemen’s Convention

Forage quality means different things to different people. Forage quality varies tremendously among and within forage crops. Forage quality needs varies among and within animal species. Forage quality has been defined in terms of protein, fiber, lignin content, relative feed value, relative forage quality, color, smell, leafiness, fineness of stems, total digestible nutrients, and other physical and/or chemical components. All of these components have merit, but all fall short of clearly defining forage quality. Factors such as average daily gains, conception rates, milk production, wool production, etc. are reliable indicators of forage quality. Forage quality can be defined as: the …


Foreword [2005], Garry D. Lacefield, Christi L. Forsythe Jan 2005

Foreword [2005], Garry D. Lacefield, Christi L. Forsythe

Forage Symposium at the Kentucky Cattlemen’s Convention

No abstract provided.


Sdsu Cow/Calf Teaching And Research Unit, Dick Pruitt, Kevin Vanderwal, Anna Drew Jan 2005

Sdsu Cow/Calf Teaching And Research Unit, Dick Pruitt, Kevin Vanderwal, Anna Drew

South Dakota Beef Report, 2005

The SDSU Cow/Calf Unit (CCU) provides cattle and facilities for numerous Animal Science and Range Science classes and a variety of research projects. The CCU also provides cattle for the SDSU Little International, Block & Bridle Club activities, numerous judging team workouts, and other activities that bring potential students to the SDSU campus. Kevin VanderWal and Anna Drew along with part-time student employees, manage the herd, collect research data, and assist with numerous beef cattle activities throughout the year.


Nebraska 2005 Beef Cattle Report (Complete Volume) Jan 2005

Nebraska 2005 Beef Cattle Report (Complete Volume)

Nebraska Beef Cattle Reports

Contents

Cow/Calf
Comparison of Two Development Systems for March-born Replacement Beef Heifers
Effects of Supplemental Protein During Gestation and Grazing Sub-irrigated Meadow During the Postpartum Interval on Pregnancy Rates of Spring Calving Cows and Calf Growth
The Effects of Temperature and Temperature-Humidity Index on Pregnancy Rate in Beef Cows
Effects of Dried Distillers Grains Supplementation Frequency on Heifer Growth
Reproductive Response in Heifers Fed Soybeans During Post Weaning Development

Grazing
The Effects of Dried Distillers Grains on Heifers Consuming Low or High Quality Forage
Tree Growth and Cattle Weight Gain in a Ponderosa Pine System
Determination of Undegradable Intake Protein …


Cover & Acknowledgments: 2005 Beef Cattle Report Jan 2005

Cover & Acknowledgments: 2005 Beef Cattle Report

Nebraska Beef Cattle Reports

Appreciation is expressed to the following firms, associations, or agencies who provided grant support for research in the beef cattle program.


Back Cover: 2005 Beef Cattle Report Jan 2005

Back Cover: 2005 Beef Cattle Report

Nebraska Beef Cattle Reports

Two Programs -- One Industry

Grazing Livestock Systems Major
Feedlot Management Internship Program

Beef . . . Built on Partnerships


Comparison Of Aquatic Life Depicted In Illustrations And Plaster Casts Of The Punt Relief From The Temple Of Hatshepsut At Deir El-Bahari, Emily Lord, Eugene G. Maurakis Jan 2005

Comparison Of Aquatic Life Depicted In Illustrations And Plaster Casts Of The Punt Relief From The Temple Of Hatshepsut At Deir El-Bahari, Emily Lord, Eugene G. Maurakis

Virginia Journal of Science

The primary objective of this study is to document differences between image characteristics of two sources (illustrations in Naville, 1898; and images in the cast of the relief at Virginia Museum of Fine Arts (VMFA) of the Punt relief from the temple of Hatshepsut at Deir El-Bahri. Our second is to compare cast images to photographs of the original relief. Characteristics of 30 species in the illustrations were described and compared to descriptions of the corresponding 30 species photographed from the cast at VMFA. The number of differences and similarities were recorded for each pair of corresponding icons and used …