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Full-Text Articles in Life Sciences
The Vegetational Composition Of The Samuel H. Ordway Memorial Prairie, Fred K. Carl
The Vegetational Composition Of The Samuel H. Ordway Memorial Prairie, Fred K. Carl
Electronic Theses and Dissertations
This thesis represents the first half of a two year study of the vegetational composition of the Samuel H. Ordway, Jr. Memorial Prairie. Quadrat and point frame sampling was completed along 100 transects distributed over the 10 pastures. Biomass for the study area was determined to be 133. 3 g•m-2 for live weight and 104.0 g•m-2 for mulch. Basal cover for Ordway Prairie was found to be 12.5%. The study area was found to be predominantly occupied by warm season species. Andropogon scoparius was found to be highest in relative density while Carex was highest in relative frequency. …
The Effect Of Foliar Fertilization On Soybean Yield And Leaf Necrosis, Robert Jay Goos
The Effect Of Foliar Fertilization On Soybean Yield And Leaf Necrosis, Robert Jay Goos
Electronic Theses and Dissertations
The soybean (Glycine max (L.) Merrill) is a very important world crop. The seed is rich in both protein and oil, making it a valuable human food resource. Many scientists believe that there are physiological barriers preventing increased soybean yields. Any agronomic discovery that would consistently increase soybean yields would be important to world food production. One possible yield barrier in soybeans concerns the mineral nutrition of the plant during the seed-filling stages of growth. During this period of growth, translocation of N, P, K, and S from the plant foliage to the developing seed occurs, accompanied by a virtual …
The Influence Of Isotonic And Isokinetic Weight Training On Vertical Jumping Proficiency, Jeffrey Thomas Spielman
The Influence Of Isotonic And Isokinetic Weight Training On Vertical Jumping Proficiency, Jeffrey Thomas Spielman
Electronic Theses and Dissertations
The purpose of this study was to determine the influence of isotonic and isokinetic weight training on vertical jumping proficiency as measured by a modified vertical jump. The subjects were college students enrolled in the Fitness and Lifetime Activities Program at South Dakota State University in Brookings, South Dakota. Isotonic and isokinetic training were assigned to the two experimental groups with the third group serving as controls. Training for the experimental groups consisted of isotonic circuit training on a Universal weight machine and isokinetic training on a Leaper machine. Data analysis included a reliability and reproducibility assessment, and a one-way …
An Evaluation Of High Protein Oat Forage For Dairy Cattle, Thomas Lee Schroeder
An Evaluation Of High Protein Oat Forage For Dairy Cattle, Thomas Lee Schroeder
Electronic Theses and Dissertations
As world population climbs toward the 6 billion mark predicted for the turn of the century, it becomes of grave importance that we meet the challenge of human food production. In developed nations, urban sprawl is devouring land once used for agricultural purposes, while in underdeveloped nations, malnutrition is commonplace. The technology of the 21st century will need to develop new methods and means whereby grains can be increasingly used to provide the nutritional needs of humans. Therefore, animal scientists must work toward even more efficient utilization of roughages by ruminant animals. Efficient conversion of roughages to high quality human …
Reasons Why Cows Were Removed From The Sdsu Fairy Herd 1. Discriminant Analysis To Classify Cows With Or Without Reproductive Problems, Fred Tidemann
Reasons Why Cows Were Removed From The Sdsu Fairy Herd 1. Discriminant Analysis To Classify Cows With Or Without Reproductive Problems, Fred Tidemann
Electronic Theses and Dissertations
One of the keys to financial success in the dairy business is the ability of management to detect herd problems and correct them instead of culling cows. It is well known that the average productive life of the dairy cow is less than 4 yr, which is short compared with her potential life. Involuntary removal of cows causes economic loss directly as a result of its effect on yearly milk production, increased replacement cost, and indirectly because the potential selection differential is reduced with premature loss of high producing cows. The degree of culling is related to important economic considerations …
A Comparison Between Crossbred And Straightbred Production Of Targhee Range Ewes, James M. Pajl
A Comparison Between Crossbred And Straightbred Production Of Targhee Range Ewes, James M. Pajl
Electronic Theses and Dissertations
This investigation was initiated. to determine the effect of crossbred vs. straightbred production under the environmental conditions found at the Antelope Range Research Station, Buffalo, South Dakota.
Western Corn Rootworm Sex Pheromone; Field Trapping Studies, Michael J. Lockwood
Western Corn Rootworm Sex Pheromone; Field Trapping Studies, Michael J. Lockwood
Electronic Theses and Dissertations
The purpose of this study was to explore the potential of monitoring field populations of the NCR and WCR beetles with pheromone baited sticky traps. Predictions of CRW infestations in corn fields on a single field basis have yet to be achieved. The objectives of this study were: 1. To determine the effects of trapping procedures on CRW beetle trap catch variability: trap design, trap height, pheromone age, pheromone concentration and beetle density. 2. To determine the impact of environmental factors on daily trap catch variability: temperature (OC), wind speed (m/sec), and relative humidity (%) taken at hourly intervals. 3. …
Rotaviral Enteritis In Gnotobiotic Pigs: A Scanning Electron Microscopic Study, Marcus W. Johnshoy
Rotaviral Enteritis In Gnotobiotic Pigs: A Scanning Electron Microscopic Study, Marcus W. Johnshoy
Electronic Theses and Dissertations
The objectives of this study were: 1. To experimentally reproduce rotaviral diarrhea in gnotobiotic pigs. 2. To determine the appearance of the normal intestine by scanning electron and light microscopy. 3. To compare by scanning electron and light microscopy the appearance of segments from different areas of intestine and to determine the development, location, and severity of rotaviral lesions in gnotobiotic pigs.
Discharge Measurement And Energy Efficiency Evaluation Of Irrigation Pumping Plants, Bruce A. Jennings
Discharge Measurement And Energy Efficiency Evaluation Of Irrigation Pumping Plants, Bruce A. Jennings
Electronic Theses and Dissertations
No information has been available regarding efficiencies of electric irrigation pumping plants in South Dakota. Pumping plant discharge, a key parameter in the calculation of pumping plant efficiency, is often difficult to measure in the field. A project was initiated at South Dakota State University in 1976 to investigate field pumping plant efficiencies. The following objectives were established for the project. 1. To investigate various methods of measuring irrigation pumping plant discharge. 2. To develop a suitable field procedure for determining electric irrigation pumping plant efficiency. 3. To measure energy efficiency of selected electric irrigation pumping plants in South Dakota.
Effects Of Strain On Response Of Laying Hens To Low Protein Diets And Amino Acid Supplements, Ali B. Kashani
Effects Of Strain On Response Of Laying Hens To Low Protein Diets And Amino Acid Supplements, Ali B. Kashani
Electronic Theses and Dissertations
Corn is by far the most widely used cereal grain in the United States for poultry feeding. In addition to its high energy content, corn provides adequate amounts of the essential fatty acids for maximum rates of growth and egg production. Palatability and ample xanthophyll and provitamin A contents of fresh corn are some o the other contributing factors for its popularity in livestock feeding. The most serious limitation in the nutritional value of corn as well as other cereal grains lies in the fact that they are low in both quantity and quality of protein. It has been a …
Nonsporing Anaerobic Bacteria In Foods, Sylvia M. Huppler
Nonsporing Anaerobic Bacteria In Foods, Sylvia M. Huppler
Electronic Theses and Dissertations
Anaerobic non spore forming bacteria are not detected in routine food examinations, and their occurrences in foods has seldom been reported in the literature. The purpose of this study is to determine the occurrence of non-spore forming anaerobes, the identification of the isolates found, and the possible growth and multiplication in foods which might contribute to spoilage or food illness.
Partial Characterization And Comparison Of Rhizobia From Astragalus Flexuosus Glycyrrhiza Lepidota, And Trifolium Spp., Elmer L. Eide
Partial Characterization And Comparison Of Rhizobia From Astragalus Flexuosus Glycyrrhiza Lepidota, And Trifolium Spp., Elmer L. Eide
Electronic Theses and Dissertations
Biological nitrogen fixation, a means of alleviating our increasing dependence on synthesized nitrogen fertilizers, is being studied with renewed interest. Production of nitrogen fertilizer requires large amounts of natural gas and other non-renewable energy sources, while the energy for biological nitrogen fixation is derived either directly or indirectly from photosynthesis. With only limited supplies of natural gas and an increasing population, and thus increasing demand for food, the advantages and even necessity of understanding and enhancing biological nitrogen is obvious. The nitrogenase enzyme complex which catalyzes the reduction of dinitrogen to ammonia is possessed by a limited number of species …
Anatomical Studies During Floral Induction, Evocation And Initiation In Eucharis Grandiflora, Planch., The Amazon Lily, Raphael T. Deba
Anatomical Studies During Floral Induction, Evocation And Initiation In Eucharis Grandiflora, Planch., The Amazon Lily, Raphael T. Deba
Electronic Theses and Dissertations
Several questions were posed at this point which led to the hypotheses to be tested in this investigation. The experimental design was divided into 3 phases. For a detailed description of the design, see Appendix A. Phase I of this study involved a comparative study of the anatomy of the apices of plants of Eucharis grandflora, the Amazon lily, exposed to heat (27-29° C) for one, two, three, four or five weeks, in an effort to see if manifestations of floral evocation and/or initiation are in evidence when compared to the control. Since the time from the end of heat …
Primary Productivity In Lake Cochrane, South Dakota, During And After Sediment-Control Dam Construction, Randall Francis Brich
Primary Productivity In Lake Cochrane, South Dakota, During And After Sediment-Control Dam Construction, Randall Francis Brich
Electronic Theses and Dissertations
Lake Cochrane was selected for this study because of its history of superior water transparency (Haertel 1972, 1976b). Significant amounts of silt and chemicals enter the lake with runoff at 3 locations (Haertel unpublished data). Restriction or impediment of runoff at these locations should result in improved water transparency (Haertel 1976b, Siegel 1975). Therefore, East Dakota Conservancy Sub-District and the South Dakota Department of Wildlife, Parks, and Forestry decided to impede runoff waters by means of 3 sediment-control dams incorporated into the perimeter road system of the lake and financed through a grant from the Environmental Protection Agency (Siegel 1975) …
A Study Of The Macrobenthic Community In Lake Cochrane, South Dakota, David R. German
A Study Of The Macrobenthic Community In Lake Cochrane, South Dakota, David R. German
Electronic Theses and Dissertations
As part of a continuing study of the biological community of Lake Cochrane, South Dakota, a quantitative survey of the macroscopic bottom fauna was made between the early part of April, 1976 and December, 1976. It was hoped that such a study could provide baseline data for an understanding of the interactions that occur between benthic organisms and other biological components of the lake system. The lake's primary productivity and phytoplankton and zooplankton standing crops have previously been studied by Haertel (1972, 1976) and Steinberg (1972). When this study was being conducted, sediment control dams were being built on three …
Blood Gases And Certain Energy Metabolite Concentrations In Ammonia Intoxicated Sheep, George E. Romkema
Blood Gases And Certain Energy Metabolite Concentrations In Ammonia Intoxicated Sheep, George E. Romkema
Electronic Theses and Dissertations
The objectives of this study were to measure the changes occurring in certain blood parameters during acute ammonia intoxication. It was hoped that these changes would reflect and thereby provide insight into the effects of acute ammonia intoxication on metabolic processes. Blood pH, p02, and pC02 were measured in order to observe possible metabolic disturbances as reflected in the acid-base balance. Glucose was measured due to its importance as a basic energy source and metabolic intermediate. Volatile fatty acids were measured because they serve as an important energy source in ruminants. Non-esterified fatty acids and triglycerides were …
Partial Purification Of Heat Stable Enterotoxin Produced By Escherichia Coli Isolated From A Case Of Porcine Colibacillosis, Lee Ann Zochert Swanson
Partial Purification Of Heat Stable Enterotoxin Produced By Escherichia Coli Isolated From A Case Of Porcine Colibacillosis, Lee Ann Zochert Swanson
Electronic Theses and Dissertations
Colibacillosis (CB) in livestock is an economically important disease caused by the bacterium Escherichia coli. It is estimated that nearly one third of all baby pigs born in South Dakota die prior to weaning, and one fourth of these deaths is believed to be caused by CB (62). Similarly, it has been stated that 6 to 20% of calves born alive die from this disease (3). The term colibacillosis encompasses a group of diseases caused by E. coli in neonatal and weaned animals and humans (3). The several different types of CB are due to the differences in tissue localization …
Effect Of Heat Treatment On Protein Quality And Utilization Of Soybean And Sunflower Meals By Dairy Cattle, Mohammad Ahrar
Effect Of Heat Treatment On Protein Quality And Utilization Of Soybean And Sunflower Meals By Dairy Cattle, Mohammad Ahrar
Electronic Theses and Dissertations
Effect of heat treatment on soybean and sunflower meal proteins were studied using in vitro and in vivo techniques. In experiment I, soybean meal (SBM) and sunflower meal (SFM) were subjected to steam heating about 120 C for 25 to 30 seconds using a commercial cooker extruder. The heat treatment was designed to reduce solubility of the SBM and SFM in the rumen, thereby allowing more soybean meal protein and sunflower meal protein to be undigestible in the rumen but still digestible in the lower digestive tract when fed to cattle. Solubilities of protein in SBM and SFM were reduced …
Performance Of A Diurnally Tracking Solar Energy-Intensifier, Calvin E. Siegel
Performance Of A Diurnally Tracking Solar Energy-Intensifier, Calvin E. Siegel
Electronic Theses and Dissertations
The United States agricultural system provides numerous opportunities in which solar energy can be utilized. Low to moderate temperature rise collectors can provide a large percentage of the energy requirements normally met by using high quality fossil fuels. As world demand for food production increases due to a growing population, alternative sources of energy need to be developed and applied as substitutes for these increasingly scarce fossil fuels. Agriculture offers practical advantages for the use of solar heat energy because there exists sufficient area for solar collectors and a wide range of temperature applications on most farmsteads. Demand for energy …