Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Electronic Theses and Dissertations

Discipline
Institution
Keyword
Publication Year

Articles 2731 - 2760 of 3226

Full-Text Articles in Entire DC Network

Flowering And Podding Response Of Soybeans (Glycine Max) To Irrigation, John Douglas Mcleod Jan 1980

Flowering And Podding Response Of Soybeans (Glycine Max) To Irrigation, John Douglas Mcleod

Electronic Theses and Dissertations

Soybeans have recently increased in importance as an alternative crop throughout the corn belt and parts of the South. In South Dakota this has involved the expansion of soybean production into less well adapted cropping environments. Because of considerable interest in bean production under irrigation, a need for information on the management of irrigation water has developed, to assure high yields in these marginal areas. The increasing demand for limited supplied of irrigation water, the marginal or poor quality of many of these waters, and the increasing awareness of the energy cost of irrigating have all intensified the necessity to …

Go to article

The Effect Of Ferric-Nitrilotriacetic Acid On Selected Hemogram Parameters Of Gestating And Lactating Swine And Their Offspring, Thomas Allen Heirigs Jan 1980

The Effect Of Ferric-Nitrilotriacetic Acid On Selected Hemogram Parameters Of Gestating And Lactating Swine And Their Offspring, Thomas Allen Heirigs

Electronic Theses and Dissertations

Ever since man has moved to confinement farrowing of swine, the problem of iron-deficiency in baby pigs has increased. The problem can be partially alleviated by various treatments which can be employed by the swine producer. However, many of these treatments stress to the young piglet and involve much time and labor, which may not be available during parturition. A beneficial tool to the porcine producer would be the elimination of both the stress placed on the neonatal pig and of the extra labor providing a hematinic which would be administered prepartum to the dam. The hematinic employed must be …

Go to article

Summer And Fall Ecology Of Gray Patridge In Eastern South Dakota, Jerry W. Hupp Jan 1980

Summer And Fall Ecology Of Gray Patridge In Eastern South Dakota, Jerry W. Hupp

Electronic Theses and Dissertations

Gray partridge (Perdix perdix) nesting biology, summer and fall habitat utilization, home range, and food habits were studied in Brookings County, South Dakota, during 1978-79. Data were collected on a 62 km² study area 16 km northeast of Brookings. Nesting habitats, success, and clutch size were determined from 44 randomly located nests. Most nests (91%) were in grassy roadsides and fencerows. Few birds nested in cover dominated by legume vegetation. Average clutch size of completed nests was 17.8 eggs and nest success was 37%. Mammalian predation was the major cause (50%) of nesting failure. Gray partridge habitat utilization was determined …

Go to article

Feeding Value Of High Protein Oat Silage Versus Corn Silage For Dairy Cows, Tilahun Sahlu Jan 1980

Feeding Value Of High Protein Oat Silage Versus Corn Silage For Dairy Cows, Tilahun Sahlu

Electronic Theses and Dissertations

Corn accounts for 80% of the total silage production in the United States while oats ranks second as a feed grain crop. Oats are a major crop in areas of the world where temperatures are cool and short growing seasons are not well suited for corn production. South Dakota is the leading oat producing state in the nation with 1. 68 million kilograms of oats produced annually. Oats play an important roll as animal feed because among common cereals in the United States it ranks highest in both protein and lysine content. Due to the wide genetic diversity of oat …

Go to article

Stand Densities Of Interseeded Alfalfa During The Initial Years Of Establishment And The Effect Of Applied Nitrogen And Phosphorous On Five Selected Grasses, Levi Mudogo Akundabweni Jan 1980

Stand Densities Of Interseeded Alfalfa During The Initial Years Of Establishment And The Effect Of Applied Nitrogen And Phosphorous On Five Selected Grasses, Levi Mudogo Akundabweni

Electronic Theses and Dissertations

This study was conducted to test the feasibility of establishing alfalfa (Medicago sativa L.) in the semi-arid grasslands of north central and north western South Dakota, as a means of pasture renovation. The north central and northwestern South Dakota regions are, for the most part, native grasslands. The yield potential of these resources is primarily limited by lack of adequate precipitation. Not much research has been done in these regions to establish the magnitude of severity of factors such as nitrogen limitation and pasture and range diseases, which may, separately or in combination with soil moisture, be limiting yield potentials …

Go to article

A Survey Evaluation Of South Dakota Beef Cattle Production, Vernon Dooley Jan 1980

A Survey Evaluation Of South Dakota Beef Cattle Production, Vernon Dooley

Electronic Theses and Dissertations

The beef industry is of paramount importance to the economic activity of South Dakota. Therefore, it is essential that information be made available which can serve as a guide to the development of increasingly more efficient beef production systems. Since total pounds of weaned calf represent the salable product of cow-calf operations, this is the characteristic of primary interest to producers and researchers. Fertility of the breeding herd, livability of calves and weaning weight of calves are all components of this profit-determining characteristic. Problems of low fertility are difficult to study, especially under range conditions were many of the nation’s …

Go to article

Teenagers Teaching Nutrition: Effects On Their Own Dietary Habits, Marlys Hauck-Fenner Jan 1980

Teenagers Teaching Nutrition: Effects On Their Own Dietary Habits, Marlys Hauck-Fenner

Electronic Theses and Dissertations

This researcher first felt the need for teenage nutrition education beyond the traditional in-class activities after teaching several years of home economics at the high school level. During discussions, students revealed that they daily consumed only small quantities of food in order to lose weight or remain slim. Diets leaned heavily towards meats and carbohydrate foods, and included very few fruits and minute quantities of vegetables other than potatoes. Students also showed a great reluctance to prepare or sample unfamiliar foods in the laboratory, especially vegetables and milk products. Discussions with other teachers showed those to be common problems in …

Go to article

A Plant Growth Study Of 18 Flax (Linum Usitatissimum, L.) Genotypes, Mick Sikaenyi Mwala Jan 1980

A Plant Growth Study Of 18 Flax (Linum Usitatissimum, L.) Genotypes, Mick Sikaenyi Mwala

Electronic Theses and Dissertations

Flax is an important oilseed cop in the United States. Limitations on seed yield have been a major concern of researchers trying to develop high yielding flax cultivators. Dybing stated that comparative studies of physiological and biochemical factors could provide necessary insight into the cause of these limitations. Comstock concluded that there was sufficient genetic variability in the Flax World Collection to meet any breeding objective. Lay et al. considered the question of what physiological parameters could be measured to identify high yielding genotypes, and when in the life cycle of a plant those parameters could be influencing seed yield …

Go to article

The Effectiveness Of Aeration And Potassium Permanganate Oxidation And Filtration On Removal Of Iron And Manganese From Ground Water, Steven J. Quail Jan 1980

The Effectiveness Of Aeration And Potassium Permanganate Oxidation And Filtration On Removal Of Iron And Manganese From Ground Water, Steven J. Quail

Electronic Theses and Dissertations

The United States Public Health Service (USPHS) established water quality standards in 1946 and revised them in 1956 and 1962. In these standards the maximum recommended concentrations of iron and manganese were 0.03 and 0.05 mg/l respectively. Because trace amounts of these elements are essential for proper nutrition of both plants and animals, the recommended limits are not based on any physiological or environmental considerations. Rather, the presence of iron and manganese in water is objectional because the precipitation of these metals alters the appearance of the water, turning it a turbid yellow brown to black. The Brookings, South Dakota …

Go to article

A Study Of The Elderly's Anticipated Participation In Educational Activities, Roger Reed Jan 1980

A Study Of The Elderly's Anticipated Participation In Educational Activities, Roger Reed

Electronic Theses and Dissertations

The main objectives of this study were: (1) to determine the extent to which persons who are fifty through sixty- nine years of age anticipate participating in educational activities; (2) to determine how the conditions under which educational activities are offered would effect [sic] the anticipated participation of the elderly, and (3) to ascertain what factors explain anticipated participation in educational activities of the elderly. The units of analysis were individuals who were at least fifty years of age but no more than seventy years of age on t heir last birthday and who had permanent residence within thirty-five miles …

Go to article

Ozonation Of A Municipal Groundwater Supply To Reduce Iron, Manganese, And Trihalomethane Formation, Richard Alan Stoebner Jan 1980

Ozonation Of A Municipal Groundwater Supply To Reduce Iron, Manganese, And Trihalomethane Formation, Richard Alan Stoebner

Electronic Theses and Dissertations

The purpose of this investigation was to determine the feasibility of using ozonation followed by filtration for removal of iron and manganese and prevention of trihalomethane formation. To avoid disruption of the treatment plant operation, pilot-scale units were used in the investigation. The filter media and filtering rates employed during the pilot studies were identical to those used at the East Water Treatment Plant.

Go to article

Partitioning Energy Requirements Of Angus, Charolais And Reciprocal Cross Cows, Vernon L. Anderson Jan 1980

Partitioning Energy Requirements Of Angus, Charolais And Reciprocal Cross Cows, Vernon L. Anderson

Electronic Theses and Dissertations

Increasing energy costs have stimulated more interest in efficient use of our natural resources. Utilization of energy in agricultural enterprises needs to be critically evaluated for economic survival of the enterprise. Feed energy required for beef production comes largely from harvested and unharvested forage and grasses constitute a high proportion of the costs of maintaining a cow. These costs have increased along with other production inputs. Beef cattle producers need to know how total feed energy is utilized in order to increase their efficiency. Cow herd efficiency is extremely important, especially the energetic efficiency of various size groups. Knowing the …

Go to article

The Effects Of Acute Ammonia Toxicity On Certain Blood Chemistries In Sheep, Gayleen Riedemann Jan 1980

The Effects Of Acute Ammonia Toxicity On Certain Blood Chemistries In Sheep, Gayleen Riedemann

Electronic Theses and Dissertations

Protein has always been in short supply in the world. This will be even more evident when the world’s population reaches the projected 5.8 billion by the year 2000. Rosenfeld noted that not only will there be more mouths to feed, but there is also a decrease in cropland due to increased housing and industry. For these reasons, along with the monetary benefits, urea has been added to feeds for ruminants to prevent the waste of valuable protein. The Board on Agriculture and Renewable Resources cited several factors which may cause urea toxicity to develop: (1) lack of an adequate …

Go to article

The Effects Of Sex And Hormonal Implant On Carcass Characteristics And Palatability, J. David Stout Jan 1980

The Effects Of Sex And Hormonal Implant On Carcass Characteristics And Palatability, J. David Stout

Electronic Theses and Dissertations

Consumer demand for beef has undergone a number of dramatic changes during recent years. Consumers are expressing a preference for reasonably priced beef cuts with a high proportion of lean in relation to fat. Increasing demand for ground beef and steaks has prompted the meat industry to look at the use of a variety of production methods. The hotel, retail and industrial trades utilize large amounts of ground beef and restructured steaks. Future production may be geared toward making ground beef from chuck, foreshank, brisket, short plate, flank and round, with the desire to sell the rib meat and short …

Go to article

The Influence Of Frame Size On Growth And Carcass Characteristics In Swine Taken To Heavy Weights, Wayne Vanderwert Jan 1980

The Influence Of Frame Size On Growth And Carcass Characteristics In Swine Taken To Heavy Weights, Wayne Vanderwert

Electronic Theses and Dissertations

The current and somewhat controversial trend in swine selection is in the direction of a larger framed, later maturing animal. One goal of producers in changing to this type of animal is to produce a hog with more marketing flexibility, that is, a hog that may be carried to heavier weights without becoming over fat or that could be marketed at lighter weights and produce a very lean, muscular carcass. Excess fat is an unnecessary product in the meat animal industry that is expensive to produce from a feed efficiency standpoint. Research discussed later clearly indicated that changes in feed …

Go to article

Immunological Properties Of Streptococcus Mutans / By Bryan Tipton Sullivan, Bryan Tipton Sullivan Jan 1980

Immunological Properties Of Streptococcus Mutans / By Bryan Tipton Sullivan, Bryan Tipton Sullivan

Electronic Theses and Dissertations

No abstract provided.

Go to article

Biogenetic-Type Syntheses Of Some Sesquiterpene Lactones, Daniel Arthur Benigni Jan 1980

Biogenetic-Type Syntheses Of Some Sesquiterpene Lactones, Daniel Arthur Benigni

Electronic Theses and Dissertations

No abstract provided.

Go to article

A Histological And Histochemical Study Of Skeletal Tissue Of Polyodon Spathula, Andrea Kay Miksa Jan 1980

A Histological And Histochemical Study Of Skeletal Tissue Of Polyodon Spathula, Andrea Kay Miksa

Electronic Theses and Dissertations

No abstract provided.

Go to article

The Evaluation Of An Independent Study Kit To Train Home Care Workers, Lois Ann Vikse Jan 1980

The Evaluation Of An Independent Study Kit To Train Home Care Workers, Lois Ann Vikse

Electronic Theses and Dissertations

A descriptive study was done to assess the effectiveness of an independent study kit to train Home Care workers in basic skills, identify procedures essential to successful use of independent study and to document problems occurring with its use A two part instrument was developed, based upon guidelines of the Model Curriculum and Training Guide developed by the National Council of Homemaker-Home Health Aide Services, to assess changes in attitude and knowledge following the use of the independent study training program. Twenty-seven subjects completed the training program and the pre and posttests. Results were analyzed using the paired t-test to …

Go to article

The Development Of A Selective-Differential Medium For The Isolation And Detection Of Yersinia Enterocolitica, Hurbert Lap Chung Wong Aug 1979

The Development Of A Selective-Differential Medium For The Isolation And Detection Of Yersinia Enterocolitica, Hurbert Lap Chung Wong

Electronic Theses and Dissertations

No abstract provided.

Go to article

The Effects Of Processed Wheys And Sodium Caseinate On Composition And Consumer Acceptance Of Ice Cream, Dwight Spencer Coder Jan 1979

The Effects Of Processed Wheys And Sodium Caseinate On Composition And Consumer Acceptance Of Ice Cream, Dwight Spencer Coder

Electronic Theses and Dissertations

Ice cream dates back to before the Roman Empire (6), and since has remained a world favorite. In the U.S., consumption of ice cream has been about 8.3 kg per capita per year since 1950 (58). In 1950, the frozen dessert industry used approximately 5.9% of the milk supply; however in 1977 this had increased to 9.4% (58). This represents a sizable portion of the U.S. dairy industry, which in 1978 used 6.2 million metric tons of milk equivalents to produce 4.6 billion liters of frozen desserts, including 3.1 billion liters of ice cream (2). Today, the ice cream industry …

Go to article

An Ultrastructural Study Of Fresh And Ensiled Alfalfa Using The Light And Transmission Electron Microscope, Janet Louise Lazo-Davis Jan 1979

An Ultrastructural Study Of Fresh And Ensiled Alfalfa Using The Light And Transmission Electron Microscope, Janet Louise Lazo-Davis

Electronic Theses and Dissertations

Late bud alfalfa was sampled prior to cutting and after 17 and 51 days of ensiling. Leaf and stem tissue were separated and immediately placed in 2.5% glutaraldehyde followed by 1% osmium textroxide for fixation. Following acetone dehydration, samples were embedded in Spurr plastic for examination under the light (LM) and transmission electron (TEM) microscopes. Light microscopy was used to differentiate cell types and tissues, e.g. epidermis, chlorenchyma, phloem, xylem, and pith. Iodine staining (LM) showed starch localization in chlorenchyma cells. Transmission electron microscopy analysis showed starch localized in chloroplasts of chlorenchyma. Leaf cells averaged nine chloroplasts per cell section …

Go to article

Feeding And Housing Of Dairy Calves, Lester Vance Schaffer Jan 1979

Feeding And Housing Of Dairy Calves, Lester Vance Schaffer

Electronic Theses and Dissertations

In an 18 mo study antibiotic containing mastitic milk was collected from infected cows and fermented naturally for a minimum of 7 days at ambient temperature. Fermentation of antibiotic containing mastitic milk increased titratable acidity from 0.209% to 0.650% and decreased pH from 7.02 to 5.48. Fermentation decreased crude protein from 3.7% to 3.5% and increased NPN (% TN) from 6.0% to 8.4%. Penicillin was detected at a concentration of 1.2 IU/ml in the first milk after treatment and 0.01 IU/ml when fermented. Species of pathogenic organisms isolated from fresh and fermented milk were Staphylococcus epidermidis, Escherichia coli, Streptococcus dysgalactiae, …

Go to article

The Effects Of Varying Dietary Protein, Calcium And Phosphorus In Starter Diets For Early Weaned Pigs, Wayne Eldon Schiefelbein Jan 1979

The Effects Of Varying Dietary Protein, Calcium And Phosphorus In Starter Diets For Early Weaned Pigs, Wayne Eldon Schiefelbein

Electronic Theses and Dissertations

Genetic selection by swine producers the past 10 to 15 years has resulted in faster growing, heavier muscled pig. In addition, confinement rearing has placed an increased emphasis upon skeletal development and bone formation. Recent research conducted at Ohio State University indicated that growing swine responded to increasing dietary protein levels if both calcium and phosphorus are also correspondingly increased but maintained at approximately a 1.3:1 ratio. This and other research has led some investigators to believe that the National Research Council's requirements for protein, calcium and phosphorus may not be adequate to support maximum growth and development. Much attention …

Go to article

Effect Of Sodium Sulfate, Calcium Level And Source And Phosphorus On The Potentiation Of Chlortetracycline And Performance Of Growing Pigs, John P. Balios Jan 1979

Effect Of Sodium Sulfate, Calcium Level And Source And Phosphorus On The Potentiation Of Chlortetracycline And Performance Of Growing Pigs, John P. Balios

Electronic Theses and Dissertations

Experiments designed to study the potentiation of antibiotic in swine were conducted over a two-year period. During the two years, 344 crossbred pigs were used in three separate experiments to study the effects of calcium sources and levels, sulfate sources and levels, and phosphorus levels in diets containing different levels of chlortetracycline. The first experiment was divided into three two-periods. During the first two weeks 50 g/ton of chlortetracycline in the diets increased gain of pigs from 0.68 to 0.72 kg. per day. Pigs fed diets containing chlortetracycline gained significantly faster when the source of calcium was sulfate rather than …

Go to article

Response Of Strain To Amino Acid Supplementation And Lysine Requirements In Low Protein Layer Diets, John B. Carey Jan 1979

Response Of Strain To Amino Acid Supplementation And Lysine Requirements In Low Protein Layer Diets, John B. Carey

Electronic Theses and Dissertations

Two primary means of meeting amino acid requirements of laying hens, and nonruminants in general, are the use of diets high enough in protein to supply the needed amounts of all amino acids along with some excesses or by feeding low protein diets supplemented with minimum levels of essential amino acids needed for maximum performance. Proper supplementation of these low protein diets requires knowledge of the laying hen's requirement for amino acids and the interrelationships among amino acids, along with information about the influence of factors such as strain and management on these requirements . One purpose of the studies …

Go to article

N-Acetyl-Dl-Tryptophan And Dl-Tryptophan Supplementation To Low Protein Starter Diets For Swine, Michael Walrod Cox Jan 1979

N-Acetyl-Dl-Tryptophan And Dl-Tryptophan Supplementation To Low Protein Starter Diets For Swine, Michael Walrod Cox

Electronic Theses and Dissertations

Supplementation of individual amino acids to low protein swine diets is of current interest in the swine industry due to attempts to reduce feed costs. Although cereal grains provide the majority of the total protein requirements for swine, the remainder must be supplied either from natural protein supplements or synthetic amino acids. Research has shown amino acid content and balance are of greater importance than total protein alone in meeting nutrient needs. Because of this, a great deal of effort has been directed toward determining single amino acid requirements of swine. Research of this nature is complicated by the varying …

Go to article

Attitudes Of Teachers And Principals Toward Nutrition Education In South Dakota Elementary Schools, Mary Beth Baker Davis Jan 1979

Attitudes Of Teachers And Principals Toward Nutrition Education In South Dakota Elementary Schools, Mary Beth Baker Davis

Electronic Theses and Dissertations

A survey of 361 elementary teachers and 285 principals in the state of South Dakota measured attitudes toward nutrition education in the elementary school. Attitudes of elementary teachers toward teaching nutrition were also assessed. Relationships between attitudes, nutrition knowledge and other characteristics were determined. Results are based on the returned responses of 272 teachers and 262 principals. Significant positive correlations were observed between elementary teachers' attitudes toward nutrition education, nutrition knowledge, and their attitudes toward teaching nutrition. Attitude scores of teachers and principals were found to vary significantly with the inclusion of nutrition in school curriculum and favorable perceptions of …

Go to article

Embryonic Screening And Isolation Of Pine Needle Abortive Factors, Keith A. Dehaan Jan 1979

Embryonic Screening And Isolation Of Pine Needle Abortive Factors, Keith A. Dehaan

Electronic Theses and Dissertations

Cattleman and veterinarian in the western states and Canada have noted the frequent occurrence of reproductive failure in cattle grazing ranges with tree stands of ponderosa pine (Pinus ponderosa). Consumption of the needles or buds from this tree have caused pregnant stock cows to abort or deliver weak calves. Retained fatal membranes are also frequently associated with pine needle abortion. Surveys conducted by the Black Hills Area Resource and Development Project in 1974 covering eight countries in western South Dakota and eastern Wyoming estimate that at least 600 calves were lost through pine needle abortion in a three year period …

Go to article

The Effect Of Sodium Hexametaphosphate On Cottage Cheese Yields, Stephen T. Dybing Jan 1979

The Effect Of Sodium Hexametaphosphate On Cottage Cheese Yields, Stephen T. Dybing

Electronic Theses and Dissertations

A major concern in the cottage cheese industry is the inefficient use of the available milk proteins. Currently, the methods of cottage cheese manufacture convert an average of only 74.9% of the milk proteins into cottage cheese, while the remainder are removed in the by-product whey (43, 56). As protein is the main determinant of both the yield and nutritional value of cottage cheese, if 25% of the available protein is lost to the whey, then potential cottage cheese yield and nutrition have been lost as well. The proteins lost in the whey are mainly -lactalbumin and β-lactoglobulin, which remain …

Go to article

First Prev Next Last