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Articles 1 - 30 of 31
Full-Text Articles in Animal Sciences
Influence Of Physiochemical And Watershed Characteristics On Mercury Concentration In Walleye, Sander Vitreus, M., Cari-Ann Hayer, Steven R. Chipps, J. J. Stone
Influence Of Physiochemical And Watershed Characteristics On Mercury Concentration In Walleye, Sander Vitreus, M., Cari-Ann Hayer, Steven R. Chipps, J. J. Stone
Natural Resource Management Faculty Publications
Elevated mercury concentration has been documented in a variety of fish and is a growing concern for human consumption. Here, we explore the influence of physiochemical and watershed attributes on mercury concentration in walleye (Sander vitreus, M.) from natural, glacial lakes in South Dakota. Regression analysis showed that water quality attributes were poor predictors of walleye mercury concentration (R2 = 0.57, p = 0.13). In contrast, models based on watershed features (e.g., lake level changes, watershed slope, agricultural land, wetlands) and local habitat features (i.e., substrate composition, maximum lake depth) explained 81% (p = 0.001) …
Corn Hybrids: Deer Taste The Difference, Joshua A. Delger, Kevin L. Monteith, Jonathan A. Jenks
Corn Hybrids: Deer Taste The Difference, Joshua A. Delger, Kevin L. Monteith, Jonathan A. Jenks
Natural Resource Management Faculty Publications
As daylight begins to illuminate the countryside, a cold wind rustles through the leaves of the weedy rows of corn that you barely had time to get in the ground this past spring. The corn plants are stunted, the few small ears of corn that did grow are not even enticing to passing blackbirds, and that stud buck captured on your trail-camera months earlier is nowhere to be seen. Meanwhile, a couple hundred yards across the fence to the south, you hear the unmistakable sound of deer running through corn. Your heart rate involuntarily increases. As the sun continues to …
Match- Mismatch Regulation For Bluegill And Yellow Perch Larvae And Their Prey In Sandhill Lakes, Jeffrey C. Jolley, David W. Willis, Richard S. Holland
Match- Mismatch Regulation For Bluegill And Yellow Perch Larvae And Their Prey In Sandhill Lakes, Jeffrey C. Jolley, David W. Willis, Richard S. Holland
Natural Resource Management Faculty Publications
Food availability may regulate fish recruitment, both directly and indirectly. The availability of zooplankton, especially to newly hatched larvae, is thought to be crucial to their early growth and survival. We examined stomach contents of larval bluegill Lepomis macrochirus and yellow perch Perca flavescens in Pelican Lake and Cameron Lake, Nebraska, in 2004 and 2005. We also determined zooplankton availability and calculated prey selection using Chesson’s a. In addition, we investigated potential match–mismatch regulation of recruitment from 2004 to 2008. Bluegill positively selected copepod nauplii and Bosmina spp., and yellow perch often selected copepods. Abundant zooplankton populations were available for …
Growing South Dakota (Fall 2010), College Of Agriculture &. Biological Sciences
Growing South Dakota (Fall 2010), College Of Agriculture &. Biological Sciences
Growing South Dakota (Publication of the College of Agriculture, Food and Environmental Sciences)
[Page] 2 Focused on Lean Growth: Despite Challenging Times, Dean Barry Dunn Has a Vision of Growth and Excellence for ABS
[Page] 6 Building Better Communities: Horizons Helps Small Town South Dakota
[Page] 8 On Campus
[Page] 9 Urban Opportunities: A New Twist to Attract Urban Youth
[Page] 10 Saddle Up: Steers for State Helps SDSU Rodeo Program Attain Success [Page] 12 Inspiring Students: This Professor's Teaching & Research Style Is Earning Awards and Student Accolades
[Page] 14 Fish Feed :The Newest Market for South Dakota Crops 15 College News [Page] 16 Field Notes from Lyman County: Bob Fanning's Experience …
Late Summer Movements By Giant Canada Geese In Relation To A September Hunting Season, Charles D. Dieter, Bobby J. Anderson, Jeffrey S. Gleason, Paul W. Mammenga, Spencer Vaa
Late Summer Movements By Giant Canada Geese In Relation To A September Hunting Season, Charles D. Dieter, Bobby J. Anderson, Jeffrey S. Gleason, Paul W. Mammenga, Spencer Vaa
Natural Resource Management Faculty Publications
The population of giant Canada geese (Branta canadensis maxima) breeding in eastern South Dakota has increased dramatically since reintroduction efforts began in the 1960s. May breeding population levels of giant Canada geese exceeded population management goals set by the South Dakota Department of Game, Fish and Parks (SDGFP) by the mid-1990s, and the population has continued to increase into the 2000s. This population increase was accompanied by an increase in goose-related conflicts such as crop depredation. In 1996, a September hunting season was implemented in select counties in eastern South Dakota in an effort to reduce the giant …
Dispersal Movements Of Subadult Cougars From The Black Hills: The Notions Of Range Expansion And Recolonization, D. J. Thompson, J. A. Jenks
Dispersal Movements Of Subadult Cougars From The Black Hills: The Notions Of Range Expansion And Recolonization, D. J. Thompson, J. A. Jenks
Natural Resource Management Faculty Publications
Dispersal plays a vital role in cougar (Puma concolor) population ecology, creating genetic viability and maintaining gene flow between populations. The naturally recolonized cougar population in the Black Hills is at the edge of the species’ range in North America and completely surrounded by the grasslands of the Northern Great Plains. Our objective was to document dispersal movements and possible range expansion of subadult cougars captured within the Black Hills ecosystem of southwestern South Dakota and eastern Wyoming. Twenty-four (n ¼ 14 males, n ¼ 10 females) subadult cougars were captured in the Black Hills. Independence of cougars from females …
Survival And Harvest Characteristics Of Giant Canada Geese In Eastern South Dakota, 2000–2004, Charles D. Dieter, Jeffrey S. Gleason, Bobby J. Anderson, Spencer Vaa, Paul W. Mammenga
Survival And Harvest Characteristics Of Giant Canada Geese In Eastern South Dakota, 2000–2004, Charles D. Dieter, Jeffrey S. Gleason, Bobby J. Anderson, Spencer Vaa, Paul W. Mammenga
Natural Resource Management Faculty Publications
The population of giant Canada geese (Branta canadensis maxima) in eastern South Dakota has increased substantially since reintroduction efforts began in the 1960s. Breeding population estimates of Canada geese exceeded the population management objective of the South Dakota Game, Fish and Parks by the mid-1990s and has continued to increase at an estimated rate of 3 to 5% per year. Goose-related crop damage complaints have also increased. In 1996, a September hunting season (September 1 to 15) was implemented in 10 counties in eastern South Dakota and was expanded in 2000 to include most of eastern South Dakota. …
Twin Screw Extrusion Of Ddgs-Based Aquaculture Feeds, S. Kannadhason, Kurt A. Rosentrater, K. Muthukumapappan, Michael L. Brown
Twin Screw Extrusion Of Ddgs-Based Aquaculture Feeds, S. Kannadhason, Kurt A. Rosentrater, K. Muthukumapappan, Michael L. Brown
Natural Resource Management Faculty Publications
Six isocaloric (3.65 kcal/g), isonitrogenous (35% dry-basis [db] protein), ingredient blends were prepared with 0, 17.5, 20, 22.5, 25, and 27.5% distiller’s dried grains with solubles (DDGS) and other ingredients (soybean meal, corn, fish meal, whey, soybean oil, vitamin and mineral mix). The blends were moisture balanced to 15% db, then extruded in a twin screw extruder using a 2 mm die at 190 rpm, and a 3 mm die at 348 rpm. Analyses of the extrudates included moisture content, expansion ratio, unit density, bulk density, sinking velocity, color (L*, a*, and b*), water absorption, water solubility, and pellet durability …
Sdsu Irm‐Spa: Trend Analysis 2002 – 2008, E.M. Mousel
Sdsu Irm‐Spa: Trend Analysis 2002 – 2008, E.M. Mousel
South Dakota Beef Report, 2010
Production and financial efficiency data from cow‐calf producers in eastern South Dakota was analyzed. Data was collected from 2002‐2008; each herd represented one observation. The database consisted of 210 production observations and 140 financial observations. Analysis of production efficiency data was conducted according to the SPA guidelines, developed by the IRM Coordinating Committee of the National Cattlemen’s Beef Association. Financial data was collected using the SPA system, in accordance with the SPA guidelines as well information collected from IRS Schedule F to calculate operating expense ratio (OER). Overall trends suggested that following the market peak of 2005, production efficiency has …
Sdsu Irm‐Spa 2008 Summary Report, E.M. Mousel
Sdsu Irm‐Spa 2008 Summary Report, E.M. Mousel
South Dakota Beef Report, 2010
Integrated Resource Management (IRM) is a method of managing the farm as a whole, rather than as separate, unrelated enterprises. Using this method, resources can be utilized to maximize efficiency and profitability of an operation. A key component of the IRM approach to management is Standardized Performance Analysis (SPA). The SPA is a cow‐calf performance analysis system that is used to integrate production and financial data using a standardized performance analysis procedure to identify production management and financial inefficiencies in the cow‐calf enterprise. These performance values can be used to identify opportunities for change. Comparing results between production years as …
Effect Of Maternal Nutrition On Fetal Adipocyte Development, T.D. Jennings, K.R. Underwood, A.E. Wertz-Lutz, A.D. Weaver
Effect Of Maternal Nutrition On Fetal Adipocyte Development, T.D. Jennings, K.R. Underwood, A.E. Wertz-Lutz, A.D. Weaver
South Dakota Beef Report, 2010
The objective of this experiment was to determine the effects of maternal nutrition on the expression of genes in fetal tissues. Genes of interest were selected because each has been demonstrated previously to influence body composition. Twenty‐two Angus‐cross bred heifers (BW = 1161 ± 19 lbs) randomly were assigned to three dietary treatments. Maternal dietary treatments were formulated and intake was controlled to provide 150% (HIGH), 100% (INT), and 80% (LOW) of maintenance energy requirements for growing pregnant Angus heifers (NRC, 2000). Heifers were on dietary treatment from d 85 to d 180 of gestation, at which point fetuses were …
Effects Of Dietary Energy Source And Corn Oil Inclusion On Plasma Metabolite And Lipid Profiles And Intramuscular Adipose And Muscle Accretion In Beef Cattle, A.E. Wertz-Lutz, R.H. Pritchard, D.C. Mcfarland, K.W. Burns
Effects Of Dietary Energy Source And Corn Oil Inclusion On Plasma Metabolite And Lipid Profiles And Intramuscular Adipose And Muscle Accretion In Beef Cattle, A.E. Wertz-Lutz, R.H. Pritchard, D.C. Mcfarland, K.W. Burns
South Dakota Beef Report, 2010
The objectives of this research were to evaluate 1) fluctuations in plasma metabolites and lipid profiles and 2) differences in satellite cell differentiation and proliferation in cattle with differences in marbling relative to total fatness. Dietary starch is thought to optimize accumulation of marbling. In this experiment, readily fermentable fiber or corn oil were substituted for starch from corn in an effort to alter adipose tissue accretion. Crossbred yearling steers (n = 144) were used in a 131 d finishing trial. The trial was designed as a 3 x 2 factorial arrangement of dietary energy source by corn oil inclusion. …
The Presence Of Growth Hormone Secretagogue Receptor (Ghrelin Receptor) In Metabolic Tissues Of Beef Cattle With Differences In Composition Of Gain, J.S. Jennings, J.A. Clapper, A.D. Weaver, A.E. Wertz-Lutz
The Presence Of Growth Hormone Secretagogue Receptor (Ghrelin Receptor) In Metabolic Tissues Of Beef Cattle With Differences In Composition Of Gain, J.S. Jennings, J.A. Clapper, A.D. Weaver, A.E. Wertz-Lutz
South Dakota Beef Report, 2010
Beef steers (n = 72) of similar age, weight (651 ± 3.1 lb), and genetic (Angus crossbred) background were used to determine the effects of growing diet composition (high‐forage vs. high‐concentrate) on the abundance of growth hormone secretagogue receptor (GHS‐R or ghrelin receptor) in metabolically important tissues of beef cattle. At trial initiation (d 0), 8 steers were harvested for initial carcass composition. The remaining 64 steers were allotted, by weight, to pen and treatment was assigned randomly. Treatments were 1) a high‐forage diet fed during the growing period (116 d) followed by a high‐concentrate diet during the finishing period …
Effect Of Supplemental Fat From Dried Distillers Grains With Solubles Or Corn Oil On Nutrient Digestibility, A.J. Bartosh, A.E. Wertz-Lutz, C.L. Wright
Effect Of Supplemental Fat From Dried Distillers Grains With Solubles Or Corn Oil On Nutrient Digestibility, A.J. Bartosh, A.E. Wertz-Lutz, C.L. Wright
South Dakota Beef Report, 2010
The objective of this experiment was to determine the effects of supplemental fat from either dried distillers grains with solubles (DDGS) or raw corn oil on the digestibility of nutrients and long chain fatty acids. When compared to corn grain and grass hay, DDGS have considerably greater levels of fat, which may negatively influence rumen microbes and nutrient digestibility. Six medium‐framed crossbred steers (initial BW = 602 ± 23.6 lb) were used in a Latin square design to determine apparent total tract digestibility of diets formulated with no supplemental fat or supplemental fat from either DDGS or raw corn oil. …
Influence Of Dietary Corn Oil On Production Efficiencies And Adipose And Muscle Accretion In Beef Cattle, R.H. Pritchard, A. Wertz-Lutz, K.W. Bruns, D.M. Wulf
Influence Of Dietary Corn Oil On Production Efficiencies And Adipose And Muscle Accretion In Beef Cattle, R.H. Pritchard, A. Wertz-Lutz, K.W. Bruns, D.M. Wulf
South Dakota Beef Report, 2010
The objective of this research was to determine shifts in metabolism associated with differences in marbling relative to total fatness in beef carcasses. Dietary starch is thought to optimize accumulation of intramuscular adipose (IAT). The two mechanisms used to alter IAT accumulation were to substitute either readily fermentable fiber or corn oil for starch from corn. The model involved yearling steers (n = 144) during a 131 d finishing phase. The control diet contained 8.5% roughage and 81.2% corn. A higher fiber finishing diet included substitution of chopped, high moisture ear corn (43.7%) and dried corn gluten feed (18.2%) for …
Digestion And Metabolism Of Diets Containing Increasing Levels Of Corn Germ, R.H. Pritchard, G.B. Kleinhans
Digestion And Metabolism Of Diets Containing Increasing Levels Of Corn Germ, R.H. Pritchard, G.B. Kleinhans
South Dakota Beef Report, 2010
A novel germ fraction is being generated by the BFrac™4 process. The 20% fat, dry, flowable material is a potential source of concentrated energy to include in Northern Plains feedlot diets. A metabolism study with wethers was conducted to evaluate how ruminants would respond to this additional fat intake in finishing diets. Total collections of urine and feces were conducted on 23 wethers fed pelleted, high‐corn content, iso‐nitrogenous diets that included 0, 10, 20, or 30% germ. Each 6‐d collection period followed 21 d adaptation periods. Increasing BFrac™ germ content caused (P < 0.01) an increase in DMI and a linear (P < 0.001) decrease in DM digestibility, probably due to the effect of DMI. There was a quadratic (P < 0.01) increase in EE digestibility, plateauing at 10% germ. Dietary DE, kcal/g declined linearly (P < 0.01) but DE intake (kcal/d) increased linearly (P < 0.05) because of higher DMI. There was no (P > 0.15) dietary effect on N digestibility, but there …
Use Of De‐Oiled Dried Distillers Grains As A Source Of Crude Protein In Finishing Cattle Diets, R.H. Pritchard
Use Of De‐Oiled Dried Distillers Grains As A Source Of Crude Protein In Finishing Cattle Diets, R.H. Pritchard
South Dakota Beef Report, 2010
A de‐oiled distillers grains (dDGS) product was evaluated as a primary supplemental CP source in finishing diets. The 3 dietary treatments used were: SBM/Urea) as a control, typical of feedlot diets; dDGS) where dDGS replaced all of the SBM and some urea; and dDGS/SBM) where a 90% dDGS/10% SBM (N basis) blend was fed iso‐nitrogenous to the other diets. Eighteen pens of 8 steers each were fed these finishing diets for 132 d. There were no differences in steer performance or carcass traits attributable to diet. The dDGS product can be used effectively to replace oilseed meals and some of …
Effect Of Standing Estrus Prior To An Injection Of Gnrh On Steriodogenic Enzyme Expression In Luteal Tissue, Kaycee Gebhart
Effect Of Standing Estrus Prior To An Injection Of Gnrh On Steriodogenic Enzyme Expression In Luteal Tissue, Kaycee Gebhart
The Journal of Undergraduate Research
Cows detected in estrus around the time of fixed-time AI had increased pregnancy success and progesterone concentrations. Additionally, GnRH following onset of estrus influenced LH pulse frequency and CL formation/function. Therefore our objective was to determine steriodogenic enzyme expression within luteal tissue of cows that were or were not detected in standing estrus prior to an injection of GnRH. Cows were synchronized with the CO-Synch protocol (day -9 100 mg GnRH; day -2 25 mg PGF2α; day 0 100 mg GnRH). Estrus was detected with the HeatWatch system. Location and size of the ovulatory follicle was determined on day 0 …
Sdsu Dairy Digest 2010, South Dakota State University Dairy Club
Sdsu Dairy Digest 2010, South Dakota State University Dairy Club
Dairy Digest
No abstract provided.
The Jackrabbit Dairy Review, Vikram Mistry
The Jackrabbit Dairy Review, Vikram Mistry
The Jackrabbit Dairy & Food Review
No abstract provided.
Copper Supplementation Of Grazing Yearling Steers Supplemented Withmolybdenum While Consuming High‐Sulfur Water, K.L. Kessler, K.C. Olson, C.L. Wright, K.J. Austin, P.S. Johnson, K.M. Cammack
Copper Supplementation Of Grazing Yearling Steers Supplemented Withmolybdenum While Consuming High‐Sulfur Water, K.L. Kessler, K.C. Olson, C.L. Wright, K.J. Austin, P.S. Johnson, K.M. Cammack
South Dakota Beef Report, 2010
There has been on‐going research conducted by South Dakota State University in the area of the consumption of high‐sulfur (S) water by steers grazing rangeland. During the summer of 2009 a trial was conducted in cooperation with the University of Wyoming on the effects of copper supplementation of grazing pasture steers supplemented with molybdenum (Mo), while drinking high‐sulfur water. The main purpose of this experiment was to gather data that may aide in the formulation of a method to counteract the negative effects of high‐S water consumed by ruminant livestock species in areas where sulfur concentrations in water sources causes …
Effects Of Molybdenum Supplementation On Performance Of Forage‐Fed Steersreceiving High‐Sulfur Water, K.L. Kessler, K.C. Olson, C.L. Wright, K.J. Austin, P.S. Johnson, K.M. Cammack
Effects Of Molybdenum Supplementation On Performance Of Forage‐Fed Steersreceiving High‐Sulfur Water, K.L. Kessler, K.C. Olson, C.L. Wright, K.J. Austin, P.S. Johnson, K.M. Cammack
South Dakota Beef Report, 2010
There has been on‐going research in the area of the consumption of high‐sulfur (S) water by steers grazing rangeland as well as forage‐fed steers in a feedlot setting. During the summer of 2009, a trial was conducted on the effects of high‐S water in finishing steers supplemented with molybdenum (Mo). The main purpose of the research was to gather data that may aid in the formulation of a supplement to counteract the negative effects of high‐S water consumed by ruminant livestock species in areas where sulfur concentration in water sources is a risk to animal health and performance. The specific …
Relationship Of Circulating Ghrelin And Leptin Concentrations In Beef Cattle Exhibitingdifferences In Composition Of Gain, J.S. Jennings, R.H. Pritchard, K.W. Bruns, D.H. Keisler, A.E. Wertz-Lutz
Relationship Of Circulating Ghrelin And Leptin Concentrations In Beef Cattle Exhibitingdifferences In Composition Of Gain, J.S. Jennings, R.H. Pritchard, K.W. Bruns, D.H. Keisler, A.E. Wertz-Lutz
South Dakota Beef Report, 2010
Beef steers (n = 72) of similar age, weight (651 ± 3.1 lb), and genetic background (Angus crossbred) were used to determine the effects of growing period diet on the relationship of plasma ghrelin and leptin concentrations with growth performance and carcass composition. At trial initiation (d 0), 8 steers were harvested for initial carcass composition. The remaining 64 steers were allotted, by weight, to pen and treatment was assigned randomly. Treatments were 1) a high‐forage diet fed during the growing period (0‐116 d) followed by a high‐concentrate diet during the finishing period (117‐209 d; GRW‐FNSH) or 2) a high‐concentrate …
Metabolizability Of Dried Distillers Grains Plus Solubles In Finishing Cattle Diets, R.H. Pritchard, J.W. Mccarthick, J. Knock, D.L. Boggs, C.J. Mueller
Metabolizability Of Dried Distillers Grains Plus Solubles In Finishing Cattle Diets, R.H. Pritchard, J.W. Mccarthick, J. Knock, D.L. Boggs, C.J. Mueller
South Dakota Beef Report, 2010
The feeding value of dried distillers grains plus solubles (DDGS) is a combination of its contributions to protein nutrition as well as caloric intake of cattle. When DDGS is included in diets at levels where dietary CP has been met, the feeding value would primarily be a function of caloric density. A replicated 4 x 4 metabolism study was conducted to measure the caloric value of DDGS at high inclusion levels. Diets were formulated to contain 0, 12, 24, or 36% DDGS. These finishing diets were fed to yearling steers during a 21 d adaptation prior to total fecal and …
Long‐Term Production And Profitability From Grazing Cattle In The Northern Mixed Grassprairie, B.H. Dunn, A.J. Smart, R.N. Gates, P.S. Johnson, M.K. Beutler, M.A. Diersen, L.L. Janssen
Long‐Term Production And Profitability From Grazing Cattle In The Northern Mixed Grassprairie, B.H. Dunn, A.J. Smart, R.N. Gates, P.S. Johnson, M.K. Beutler, M.A. Diersen, L.L. Janssen
South Dakota Beef Report, 2010
Conventional wisdom among rangeland professionals has been that for long‐term sustainability of grazing livestock operations, rangeland should be kept in high good to low excellent range condition. Our objective was to analyze production parameters, economic costs, returns, and profit using data generated over a thirty‐four year period (1969‐2002) from grazing a Clayey range site in the mixed‐grass prairie of western South Dakota with variable stocking rates required to maintain pastures in low‐fair, good, and excellent range condition classes. Cattle weights were measured at turnout and at the end of the grazing season. Gross income per acre was calculated by multiplying …
Persistence Of Various Alfalfa Populations In South Dakota Rangeland, C.G. Misar, L. Xu, R.N. Gates, A.A. Boe, P.S. Johnson
Persistence Of Various Alfalfa Populations In South Dakota Rangeland, C.G. Misar, L. Xu, R.N. Gates, A.A. Boe, P.S. Johnson
South Dakota Beef Report, 2010
Inclusion of alfalfa (Medicago sativa L.) in grasslands has long been valued to increase forage production and quality. Persistence of alfalfa in semiarid rangeland has generally been poor when non‐adapted and/or conventional hay‐type cultivars are utilized, however. Demand exists for alfalfa cultivars that establish readily and persist, particularly under grazing, in semiarid rangelands. A wild population of predominantly yellow‐flowered alfalfa (Medicago sativa subsp. falcata) was found growing and reproducing naturally in the Grand River National Grassland in northwestern South Dakota. This predominantly falcata alfalfa therefore demonstrates persistence in this semiarid environment. We initiated a study in May 2006 at the …
2010 South Dakota Beef Report, Department Of Animal And Range Sciences, South Dakota State University, Agricultural Experiment Station, South Dakota State University, Cooperative Extension Service, South Dakota State University
2010 South Dakota Beef Report, Department Of Animal And Range Sciences, South Dakota State University, Agricultural Experiment Station, South Dakota State University, Cooperative Extension Service, South Dakota State University
South Dakota Beef Report, 2010
This is the 2010 South Dakota Beef Report produced by the SDSU Department of Animal Sciences in conjunction with the Agricultural Experiment Station , and the SDSU Cooperative Extension. The articles published in this report summarize many of the beef cattle research activities conducted at South Dakota State University during 2010. The articles in this report have many levels of application. Some information has immediate application for your farm, ranch, or agribusiness. The articles include information on nutrition,management, health, growth and development, and economics of the cattle and beef industry in South Dakota.
The Influence Of Didymosphenia Geminate On Fisheries Resources In Rapid Creek, South Dakota – An Eight Year History, D.A. James, S.R. Chipps
The Influence Of Didymosphenia Geminate On Fisheries Resources In Rapid Creek, South Dakota – An Eight Year History, D.A. James, S.R. Chipps
Natural Resource Management Faculty Publications
The aquatic nuisance diatom Didymosphenia geminata was established in Rapid Creek in the Black Hills of South Dakota in 2002. Shortly thereafter, large declines (>50%) of the naturalized brown trout Salmo trutta population were observed. We evaluated the influence of water resources and D. geminata on (1) declines in brown trout biomass, (2) changes in food resources, and (3) diet of brown trout in Black Hills streams. Drought conditions were largely responsible for trout declines in Black Hills streams. However, comparison of brown trout sizestructure between the pre-D. geminata and post-D. geminata periods revealed that juvenile brown …
Respiratory Disease In Young Dairy Calves., A. D. Garcia, R. Daly
Respiratory Disease In Young Dairy Calves., A. D. Garcia, R. Daly
Dairy Science Publication Database
Respiratory disease is the second leading cause of death losses (scours is the first) in un-weaned heifer calves. Respiratory problems have increased by 34 percent in the last twenty years resulting in nearly 21 percent of all newborn calf losses (NAHMS. 2007). Heifers that survive continue to perform poorly as adult cows. In order to prevent this costly problem it is important to address both determinant and predisposing causes.
Antipredatory Defense Of Neonatal Pronghorn (Antilocapra Americana) By Yearling Male Pronghorn In Southwestern South Dakota, Christopher N. Jacques, Jonathan A. Jenks
Antipredatory Defense Of Neonatal Pronghorn (Antilocapra Americana) By Yearling Male Pronghorn In Southwestern South Dakota, Christopher N. Jacques, Jonathan A. Jenks
Natural Resource Management Faculty Publications
Antipredatory defense of pronghorn (Antilocapra americana) neonates (≤1 month old) by adult females (>18 months old) is well documented throughout the geographic range of this species. However, reports of male pronghorn defending neonates against predators are limited to a single study in northwestern Wyoming where occurrences were documented of adult males assisting female pronghorn in defending neonates against coyotes (Canis latrans). To our knowledge, defense of neonatal pronghorn by yearling males (12–18 months old) has not been reported previously for this species. We report occurrences of antipredatory defense of neonatal pronghorn by yearling males in southwestern South Dakota