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Articles 601 - 611 of 611
Full-Text Articles in Animal Sciences
Morphological Differences Among Eyeless Amphipods In The Genus Stygobromus Dwelling In Different Subterranean Habitats, David C. Culver, John R. Holsinger, Mary C. Christman, Tanja Pipan
Morphological Differences Among Eyeless Amphipods In The Genus Stygobromus Dwelling In Different Subterranean Habitats, David C. Culver, John R. Holsinger, Mary C. Christman, Tanja Pipan
Biological Sciences Faculty Publications
The amphipod genus Stygobromus occurs in a variety of subterranean habitats in North America, including caves, phreatic (groundwater) lakes, and superficial subterranean habitats (seeps and epikarst). The habitats share the absence of light but differ in other features, such as pore size of the habitat, available food, and degree of seasonality. Measurements of body size, antennal size, and antennal segment number of type specimens were compared for 56 species occurring in the eastern United States. Except for differences in body size, differences among species in the four different habitats were not significant. Body size was related to relative pore size …
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 …
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 …
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 …
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 …
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 …
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 Volunteer Fisheries Liaison Officer (Vflo) Program: An Analysis Of Recreational Fishing Data From 1995 - 2007, Claire B. Smallwood, Adrian Thomson, David Harris, Danielle Johnston
The Volunteer Fisheries Liaison Officer (Vflo) Program: An Analysis Of Recreational Fishing Data From 1995 - 2007, Claire B. Smallwood, Adrian Thomson, David Harris, Danielle Johnston
Fisheries research reports
The aim of this report was to explore the data collected by VFLOs from 1995 - 2007 in each of the state’s four marine bioregions. During this period, volunteers undertook >2,000 days of activities, the majority of which were educational displays at events such as boat shows and patrols in coastal, marine and estuarine environs. Patrols focused on interviews with recreational anglers to provide information about sustainable fishing and collect data on catch and effort.
Socially Induced Synchronization Of Every-Other-Day Egg Laying In A Seabird Colony, Shandelle M. Henson, James L. Hayward, J. M. Cushing, Joseph C. Galusha
Socially Induced Synchronization Of Every-Other-Day Egg Laying In A Seabird Colony, Shandelle M. Henson, James L. Hayward, J. M. Cushing, Joseph C. Galusha
Faculty Publications
Spontaneous oscillator synchrony has been documented in a wide variety of electrical, mechanical, chemical, and biological systems, including the menstrual cycles of women and estrous cycles of Norway Rats (Rattus norvegicus). In temperate regions, many colonial birds breed seasonally in a time window set by photoperiod; some studies have suggested that heightened social stimulation in denser colonies can lead to a tightened annual reproductive pulse. It has been unknown, however, whether the analog of menstrual synchrony occurs in birdsthat is, whether avian ovulation cycles can synchronize on a daily timescale within the annual breeding pulse. We report every-other-day clutch-initiation and …
Endangered And Threatened Wildlife And Plants; Designation Of Critical Habitat For The Salt Creek Tiger Beetle
United States Fish and Wildlife: Staff Publications
We, the U.S. Fish and Wildlife Service (Service/USFWS), designate critical habitat for the Salt Creek tiger beetle (Cicindela nevadica lincolniana) under the Endangered Species Act of 1973, as amended (Act). In total, approximately 1,933 acres (ac) (782 hectares (ha)) located in Lancaster and Saunders Counties, Nebraska, fall within the boundaries of the critical habitat designation.