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Articles 30241 - 30270 of 35945
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Monensin, Protein Supplementation And Tylosin For Feedlot Cattle, Roger N. Gates
Monensin, Protein Supplementation And Tylosin For Feedlot Cattle, Roger N. Gates
Electronic Theses and Dissertations
Scientific research has made substantial contributions to the efficiency of American agriculture. Livestock producers in particular have benefited from the extensive study of animal nutrition. Nutrient requirements of animals and the nutrient composition of feeds are essential to efficient and economical feeding of farm animals. Research over many years has provided considerable information on animal requirements and feed composition. While there are still many gaps of knowledge in those areas, available information allows wise choice in selecting feedstuffs and using them in various combinations to meet animal requirements for various productive purposes. Feed costs represent the single largest expenditure in …
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 …
Status And Reflections Of Augustana College Athletic Letterwinners, Mark O. Ekeland
Status And Reflections Of Augustana College Athletic Letterwinners, Mark O. Ekeland
Electronic Theses and Dissertations
The purpose of this study was to determine the present status of intercollegiate varsity athletic letterwinners [sic] of Augustana College, Sioux Falls, South Dakota. Of equal importance to this study were the opinions and attitudes of these athletes toward their varsity athletic experience at Augustana College. All varsity letterwinners [sic] included in records obtained from the Alumni and Athletic office files, 1920 to 1977, were sent a questionnaire. The data were analyzed through calculation of the total number of responses to each questionnaire item, as well as percentages, and averages. The questionnaire was mailed to 958 letterwinners [sic]. Five-hundred and …
An Electron Microscopic Investigation Of Bovine Abortion, Hans A. Draayer
An Electron Microscopic Investigation Of Bovine Abortion, Hans A. Draayer
Electronic Theses and Dissertations
Bovine abortion continues to cause economic loss to farmers and ranchers. In South Dakota, monetary loss from bovine abortion has been estimated at 4 to 4.8 million dollars annually. (31) Brucellosis was once considered the major cause of bovine abortion. Since the prevalence of brucellosis has been reduced to less than 1% of the total United States cattle population, there has been an increase in demand for laboratory assistance in the diagnosis of the causes of bovine abortion. With the present day technology in microbiology, histology, and serology, a confirmed identification of the causative agent of bovine abortion can be …
Ground Water Quality Variation At A Rapid Infiltration Land Treatment System Used For Tertiary Wastewater Treatment, Thomas W. Drake
Ground Water Quality Variation At A Rapid Infiltration Land Treatment System Used For Tertiary Wastewater Treatment, Thomas W. Drake
Electronic Theses and Dissertations
Based on the need to monitor nitrates because of the 1977 modifications, as well as upon the original EPA provisions for ground water monitoring, the studies reported in this thesis were initiated. The objectives of this investigation were as follows: 1. To monitor four wells within the influence of the rapid infiltration pilot units, as well as two control wells located beyond the influence of the units, to determine any substantial changes in ground water quality, which might be attributed to the rapid infiltration pilot unit operation; 2. To specifically examine the nitrogen data collected from the perforated drains in …
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 …
Comparison Of Theoretical And Experimental Results Pertaining To R-Curves In Low And High Ductility Solids, Rabindra Nath Dash
Comparison Of Theoretical And Experimental Results Pertaining To R-Curves In Low And High Ductility Solids, Rabindra Nath Dash
Electronic Theses and Dissertations
Existing linear elastic fracture mechanics and J-integral analyses are well suited for safety assessments of high-strength, low-toughness materials. These analyses apply only to the onset of crack growth, which is usually tantamount to crack instability and structural failure in that class of materials. However, this is not the case for the low-strength, high-toughness materials in which crack instability may be preceeded [sic] by extensive stable crack growth under rising loads. Here, a substantial margin of safety may exist even when the onset of crack growth is imminent. This thesis describes research leading to a ductile fracture-mechanics methodology designed to treat …
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. …
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) …
Effects Of Ay On Preimplantation Embryo Lethalities (Ay/Ay) And On Abnormal Mating Behavior (Ay/A) In Strain C57bl/6j Mice, Kevin Thomas Brock
Effects Of Ay On Preimplantation Embryo Lethalities (Ay/Ay) And On Abnormal Mating Behavior (Ay/A) In Strain C57bl/6j Mice, Kevin Thomas Brock
Electronic Theses and Dissertations
The immediate objectives of the studies to be presented were (1) to establish the presence and characterize the morphology of the Ay/Ay homozygotes before and after implantation, (2) describe the relationship between embryo and uterus, (3) characterize prenatal and neonatal losses occurring to the Ay/a mouse, and (4) test the randomness of mating selection of the Ay/a mouse. To meet the objectives, data collected from the complete serial section of embryos in utero at 90 and 132 hours post coitum (hpc) from matings of yellow females (Ay/a) by yellow males (A …
Hydraulic Characteristics Of A Rapid Infiltration Land Treatment System, Brian A. Borgstadt
Hydraulic Characteristics Of A Rapid Infiltration Land Treatment System, Brian A. Borgstadt
Electronic Theses and Dissertations
In 1977 several additions were made to the pilot units and a different flooding procedure was undertaken. The author assisted in making these changes and continued the studies concerned with the infiltration rates and ground water hydraulics portions of the research. The objectives of this portion of the overall study were to: 1. Describe and evaluate improvements and additions that were made to the rapid infiltration pilot unit during 1977, 2. Evaluate the infiltration capacities of the basins with respect to the application procedure and to compare these rates with the results of prior studies, 3. Compare the groundwater table …
Factors Affecting Oat Yields In East-Central South Dakota, Thomas M. Brandner
Factors Affecting Oat Yields In East-Central South Dakota, Thomas M. Brandner
Electronic Theses and Dissertations
The social and economic importance of accurate crop-climate forecasting and agricultural data acquisition has been noted. The advances in methodology to analyze the relationship, has also been touched upon. The particular problem considered in this paper is to determine what factors play a significant role in the output, of oat yields. The yields will be correlated with monthly precipitation and temperature figures and a yearly fertilizer application variable. If some of these variables are found to be significant-they can be used in an equation to help predict oat yields. It is hoped that this study will add to the knowledge …
Flumethasone Induction Of Parturition In The Ewe, Donald H. Rommereim
Flumethasone Induction Of Parturition In The Ewe, Donald H. Rommereim
Electronic Theses and Dissertations
The idea of controlling the time of parturition in domestic mammals has arisen in the last 15 years from the development of techniques of estrous synchronization and from studies achieved on the mechanism of birth. Controlling the time of parturition is a management technique by which a producer might reduce livestock losses at birth and/or cut production costs. Birth for the new-born, or parturition for the mother is a critical time. Controlling the time of parturition allows the producer to exercise a constrained supervision at this critical time, and therefore limit possible losses. Being present at birth allows the producer: …
Cell Surface Changes During Early Mouse Development, James Thomas Rector
Cell Surface Changes During Early Mouse Development, James Thomas Rector
Electronic Theses and Dissertations
Objectives of this thesis were to further characterize cell surface properties of preimplantation mouse embryos. A study was conducted to determine latent effects of varying pulses of CB on early postimplantation mouse embryos by comparing their abilities to hatch, to attach and to sustain growth and differentiation of ICM and trophoblast tissue. CB treatment was begun at the 8-cell stage. Objectives of the studies involving Con A were to determine (1 ) whether agglutinability with Con A changes during compaction of 8-cell embryos, (2) if changes in numbers of binding sites parallel changes in agglutinability during preimplantation development, (3) whether …
Bearing Capacity Of Surface Footings On A Sand Layer Resting On A Rigid Rough Base, Tom Walter Pfeifle
Bearing Capacity Of Surface Footings On A Sand Layer Resting On A Rigid Rough Base, Tom Walter Pfeifle
Electronic Theses and Dissertations
The purpose of this study is to present the results of some recent laboratory model testing on the ultimate vertical load carrying capacity of rough, rectangular, surface footings which were placed on granular soil. A rigid base was located at limited depths. It is expected that these results will lend to a better quantitative understanding of the problem.
Pregnancy Diagnosis In The Ewe, Michael J. Trapp
Pregnancy Diagnosis In The Ewe, Michael J. Trapp
Electronic Theses and Dissertations
The ability to diagnose pregnancy accurately, rapidly and economically before the last six weeks of gestation in the ewe could be of real value as a sheep management tool. An efficient non-surgical pregnancy test could enable the producer to reduce feed costs, increase percent lamb crop and select for fertility. It is important to the health of the ewe and to the survival of the lamb that highly productive animals should be adequately fed. About 75% of the fetus' growth occurs during the last trimester of pregnancy. Therefore undernutrition of the ewe during this part of pregnancy leads to the …
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 …
The Rhetorical Practices Of The Honorable Sigurd Anderson, Paul H. Rohde
The Rhetorical Practices Of The Honorable Sigurd Anderson, Paul H. Rohde
Electronic Theses and Dissertations
The purpose of this study was to determine the rhetorical practices of the honorable Sigurd Anderson in his public addresses from 1951 to 1978 and the relationship between his rhetorical training and his rhetorical practices. More specifically, answers to the following questions have been sought: 1) What was Anderson's rhetorical training and preparation? 2) What rhetorical tenets were advocated in Anderson's training? 3) What inventional procedures did Anderson follow in preparing his addresses? 4) What practices did Anderson follow regarding arrangement in his public addresses? 5) What stylistic practices did Anderson follow in his public addresses? 6) How did Anderson …
Treatment Capabilities Of A Rapid Infiltration Pilot Unit Treating Stabilization Pond Effluent, Richard G. Seas
Treatment Capabilities Of A Rapid Infiltration Pilot Unit Treating Stabilization Pond Effluent, Richard G. Seas
Electronic Theses and Dissertations
In October, 1972, Congress passed PL 92-500, "Federal Water Pollution Control Act Amendments of 1972 1; which is designed to upgrade the quality of the nation's water. The act requires the formulation of effluent standards that would require use of “best practicable treatment”. The effluent standards are to require use of the "best available" technology by July 1, 1983 (1). PL 92-500 requires the Environmental Protection Agency Administrator to publish information explaining which treatment techniques may be used to meet the requirement of "best practicable treatment". Land application of wastewater has been designated as a viable alternative to traditional treatment …
An In-Plant Waste Survey Of An Egg-Processing Plant, James R. Schultz
An In-Plant Waste Survey Of An Egg-Processing Plant, James R. Schultz
Electronic Theses and Dissertations
The total number of eggs produced.in the United States has increased from 40 billion in 1940 to approximately 70 billion in 196 7 (1-265). It is expected that the demand for processed eggs will increase from ten percent of the total production in the 1960's to over 30 percent in the 1970's (2-805). The increase in use of processed eggs will undoubtedly result in an increase in production wastes. To estimate the water pollution potential of egg wastes and to provide the information necessary for procurement of waste discharge permits, knowledge of the volume, strength and treatability of egg-processing wastes …
The Effect Of Anxiety On Shooting Proficiency Among College Women Basketball Players, Betty Kae Smith
The Effect Of Anxiety On Shooting Proficiency Among College Women Basketball Players, Betty Kae Smith
Electronic Theses and Dissertations
The primary purpose of this study was to investigate the relationship between state anxiety measures and shooting proficiency among women basketball players during game conditions and throughout a co11egiate basketball season. A secondary purpose was to determine the relationship between trait anxiety and state anxiety in addition to selected measures of shooting proficiency. Twelve members of the 1977-78 South Dakota State University Wome1's Basketball Team were assessed through the use of the following measures: (1) State Anxiety Inventory; (2) Sport Competition Anxiety Test; (3) pre-game heart rate; (4) game fie]d goal percentages; (5) game free throw percentages; (6) season field …
Plant Availability Of Aqueous Phosphates Removed By Fly Ash, Paul D. Weeldreyer
Plant Availability Of Aqueous Phosphates Removed By Fly Ash, Paul D. Weeldreyer
Electronic Theses and Dissertations
Recycling non-renewable resources has become increasingly. important as man has continuously expected more and more from his environment. As stated by Spendlove (1976): "Recycling certainly is not new. It appears, in fact, to be one of the most obvious laws of nature, much like the seasons, the tides, and the life and death processes. It is not surprising, therefore, that the greatest motivating force behind present recycling efforts is the worldwide concern for the deteriorating natural environment." This ever-increasing demand for more production has created the need for more stringent pollution controls to maintain an acceptable quality of life. Pollution …
Communication Between U.S. Army Senior And Junior Officers As A Factor In Separation, Jeffrey H. Wetjen
Communication Between U.S. Army Senior And Junior Officers As A Factor In Separation, Jeffrey H. Wetjen
Electronic Theses and Dissertations
The purpose of this study is to determine the communication relationship between U.S. Army Senior Officers and those Junior Officers who separated from the service voluntarily from 1966 through 1970, as revealed in selected U.S. Army studies.
Application Analysis Of A Cellular Geographic Information System, Michael Edward Wehde
Application Analysis Of A Cellular Geographic Information System, Michael Edward Wehde
Electronic Theses and Dissertations
AREAS, the Area REsource Analysis System, was developed by the author as an analytical tool for resource data manipulation in a spatial context. The data base and processing software design factors relevant to economical application are reviewed. The investigation seeks to define a procedure for selection and justification of the grid cell size used to quantify the spatial domain. The performance of a cellular information system is measured in terms of mapping and inventory accuracy. These measures of performance are evaluated for various cellularizations of a single map. The interboundary distance distribution is justified as the only unique characterization of …
Observations On Attachment And Spreading Of Zonaless Tw32/Tw32 (Brachyury Locus) And Control Icr Preimplantation Mouse Embryos, Ker Hwa Tung
Observations On Attachment And Spreading Of Zonaless Tw32/Tw32 (Brachyury Locus) And Control Icr Preimplantation Mouse Embryos, Ker Hwa Tung
Electronic Theses and Dissertations
The objective of the first part of this thesis is to test, in vitro, the adhesiveness of different stages of denuded preimplantation ICR mouse embryos for the substratum. In the second part, experiments are conducted to determine if there are differences in the attachment and spreading potential between tw32 homozygotes and normal embryos. Studies by Spiegelman (1976), Calarco and Brown (1968), Granholm and Johnson (1978), and others indicate that t12, tw32 and other lethal t alleles of the Brachyury or T-complex may affect cell surface properties. Thus, the objectives of this thesis include the acquisition of …
Utilization Of Whole Aspen Tree Material As A Ruminant Feed Component, Mahendra Singh
Utilization Of Whole Aspen Tree Material As A Ruminant Feed Component, Mahendra Singh
Electronic Theses and Dissertations
A series of three separate experiments were conducted to determine the value of aspen tree (Populus tremuloides Michx.) as a ruminant feed component in growing, finishing and wintering rations. The entire tree, including the branches, leaves and bark, was fed to Hereford steers and commercial bred stock cows. In experiment 1, sixty steers were randomly allotted to six treatments of ten each. The six treatment rations were: 93% alfalfa as control, 12% aspen, 24% aspen, 36% aspen, 48% aspen and 48% aspen (with 4% sodium hydroxide). Soybean meal was included in aspen rations in a ratio of 40% soybean meal …
The Lake Dakota Plain: An Area Study, Anselem H. Rumpca
The Lake Dakota Plain: An Area Study, Anselem H. Rumpca
Electronic Theses and Dissertations
This thesis is a systematic-area geographical study of an ancient glacial lake bed [sic] called the Lake Dakota Plain. Most of the Lake Dakota Plain is located in the northeastern part of South Dakota with a small area in adjacent North Dakota. The present study will be limited to that portion which lies in South Dakota. This area study is not limited to one criterion such as location, climate, or human occupance [sic]. Rather, it incorporates the sum total of all the criteria included in a systematic-regional study.
A Study Of Female Participation In The Labor Force In South Dakota From 1950-1970, Mary K. Wagner
A Study Of Female Participation In The Labor Force In South Dakota From 1950-1970, Mary K. Wagner
Electronic Theses and Dissertations
A study of women's labor force participation in South Dakota from 1950 to 1970 was conducted to determine: (1) the changes that occurred in labor force participation by women in South Dakota fror.1 1950 to 1970; (2) the extent to which variations in demographic, socioeconomic and structural variables helped explain observed variations in labor force participation by women; and (3) the extent to which Transition Theory was applicable in explaining changes in labor force participation among women in South Dakota. The county was designated the unit of analysis, and selected demographic, socioeconomic and structural data from the United States Bureau …
The Transfer Of Resistance To Wheat Streak Mosaic Virus (Wsmv) From Wheatgrass (Agropyron Intermedium (Host.) Beauv.) To Common Wheat (Triticum Aestivum L. Em. Thell.) By Irradiation, Harnek S. Sandhu
Electronic Theses and Dissertations
A virus disease, wheat streak mosaic, has been an important, unsolved problem of winter wheat which is a major crop in South Dakota. F1BC3 monosomic alien addition seeds having three doses of Centurk were irradiated with fast neutrons to translocate a segment of the alien chromosome accounting for immunity from wheat streak mosaic virus to a Centurk chromosome. Immune plants from the irradiated seeds were used as male parents onto Centurk and about 2,000 F1BC4 seeds obtained. Cytological examination of pollen mother cells of 151 resistant F1BC4 plants indicated that the …
The Effect Of Potassium Permanganate On The Removal Of Iron And Manganese From Ground Water, Mohammad Reza Farvardin
The Effect Of Potassium Permanganate On The Removal Of Iron And Manganese From Ground Water, Mohammad Reza Farvardin
Electronic Theses and Dissertations
For the past three years or so, a gradual migration of iron and manganese deposits has been observed in the water mains to the west of the East Water Treatment Plant of Brookings, South Dakota. These deposits have been gradually migrating further westward from the plant (8). Routine analyses of the treated water from the East Plant indicate that the iron and manganese levels are within the USPHS recommended limits (9). Consequently, conclusive evidence that this plant is the source of the problem does not exist. However, the analyses are normally conducted on samples collected shortly before backwashing the filters. …