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Articles 2941 - 2970 of 4221

Full-Text Articles in Life Sciences

The Effect Of Allopurinol (4-Hydroxypyrazolo(3,4-D) Pyrimidine) On Uric Acrid Metabolism In Differential Grasshoppers (Melanoplus Differentialis) And Armyworms (Pseudoletia Unipuncta), Henry C. Schroeder, Jr. Jan 1972

The Effect Of Allopurinol (4-Hydroxypyrazolo(3,4-D) Pyrimidine) On Uric Acrid Metabolism In Differential Grasshoppers (Melanoplus Differentialis) And Armyworms (Pseudoletia Unipuncta), Henry C. Schroeder, Jr.

Electronic Theses and Dissertations

Allopurinol, a potent inhibitor of xanthine oxidase in humans, was incorporated in the diets of differential grasshopper nymphs and adults and armyworm larvae. Uric acid contents of whole body homogenates decreased by highly significant rates. Feces uric acid decreased by highly significant rates in grasshopper nymphs and adults. Allopurinol also caused highly significant increases in mortality and inhibition of metamorphosis in study insects. These effects were not reversible by the addition of purine and pyrimidine bases, inosine, oxypurines, or uric acid. The effects were reversed by discontinuing application of allopurinol. Crude xanthine oxidase, assayed by measuring the reduction of NAD …

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Effects Of Manganese Chloride On Gravid Gilts And Newborn Pigs, Dale A. Wade Jan 1972

Effects Of Manganese Chloride On Gravid Gilts And Newborn Pigs, Dale A. Wade

Electronic Theses and Dissertations

Excessive dietary manganese in young mammals has depressed hemoglobin levels, red blood cell synthesis and growth in some investigations, while in other research these were increased. Toxic levels, mode of action and specific physiological effects are unknown although manganese, cobalt and iron appear to compete for absorption mechanisms. Manganese functions in enzyme systems and in carbohydrate and lipid metabolism, is present in red cells and plasma and may be incorporated into the hemoglobin molecule. Gravid gilts were utilized in these investigations since piglet anemia is an economic problem and manganese effects in swine have not been fully defined. Gilt rations …

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An Incrementally Distributed Mathematical Model Of A Watershed, Charles Arnold Onstad Jan 1972

An Incrementally Distributed Mathematical Model Of A Watershed, Charles Arnold Onstad

Electronic Theses and Dissertations

The utilization of distributed input parameters enables hydrologists to more adequately cope with watershed management problems. A distributed system aids in evaluating alternative solutions designed to alleviate a problem situation. As a result, the objectives of this study were (1) to develop a hydrological framework delineating the surf ace configuration of a watershed to consider parameter distribution; (2) to develop a model of hydrologic performance of a watershed using existing techniques and amenable to the physical framework; and (3) to demonstrate the versatility of the model using hypothetical data. The model versatility was demonstrated by showing the effects of different …

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Amino Acid Supplementation Of Low Protein Layer Diets, Harlal Choudhury Jan 1972

Amino Acid Supplementation Of Low Protein Layer Diets, Harlal Choudhury

Electronic Theses and Dissertations

Experiments were conducted at the South Dakota State University Poultry Research Center to study the effects of amino acid supplementation of low protein diets on performance of laying type hens. Hans, housed in 8-inch cages, were fed at 24 weeks of age typical 16% protein corn-soy diets diluted with glucose to 10.8% protein and supplemented with 0.15% DL-methionine, 0.19% L-lysine and 0.04% DL-tryptophan. After about 20 weeks of depletion, supplements of 0.05 and 0.1% DL-threonine and DL-valine and 0.1% DL-isoleucine alone and in all combinations were fed for a further period of 16 weeks using a factorial design. Individual supplements …

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Sephadex G-25 And Charcoal Separation Of Mouse Growth Inhibitors In Soybeans From Trypsin Inhibitors, Larry James Tidemann Jan 1972

Sephadex G-25 And Charcoal Separation Of Mouse Growth Inhibitors In Soybeans From Trypsin Inhibitors, Larry James Tidemann

Electronic Theses and Dissertations

Rising costs have changes man’s ideals and eating habits. Plant ingredients, because of their relatively low costs, have been increasingly used as a substitute for animal proteins. If these plant ingredients could be directly utilized by man, this would be a more efficient use of energy and nutrients. One plant source currently used in such a manner is soybeans, which is a prime source of protein for human and livestock nutrition. However, soybeans contain several factors that are detrimental to man and livestock. Heating of soybeans counteracts these factors, since the undesirable factors are heat labile. However, heat alters the …

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Nitrate Movement In Freezing Or Frozen Soils, Donald G. Moore Jan 1972

Nitrate Movement In Freezing Or Frozen Soils, Donald G. Moore

Electronic Theses and Dissertations

Nitrate movement in freezing and frozen soils was studied in both disturbed and undisturbed soils by laboratory and field investigations. Thermoelectric cooling plates were placed in insulated freezing boxes. Soil cores placed in the freezing boxes were stored, frozen, or thawed at a specific temperature or temperature gradient. Field plots and soils columns reset into the field environment were used to observe migration of either fall- or winter-applied nitrate. Movement of surface applied nitrate was caused by passage of a freezing front through either saturated or unsaturated sand or saturated Vienna loam. The nitrate movement due to freezing was greater …

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The Effect Of Level Of Dietary Protein On The Growth And Carcass Characteristics Of Growing-Finishing Swine Fed To A Heavy Weight, Keith E. Gilster Jan 1972

The Effect Of Level Of Dietary Protein On The Growth And Carcass Characteristics Of Growing-Finishing Swine Fed To A Heavy Weight, Keith E. Gilster

Electronic Theses and Dissertations

Two hundred sixteen crossbred barrows and 96 crossbred gilts were used in a series of three experiments to determine the effect of dietary protein level during three different growth periods on growth am quantitative and qualitative carcass traits of the growing-finishing pig. Pigs were fed from approximately 20 to 113 kilograms. Corn-soybean meal diets fortified with recommended levels of vitamins, minerals and an antibiotic were fed. Pigs fed 20, 18 or 16% protein diets from weights of 20 to 45 kg gained both significantly faster and more efficiently than pigs fed diets of 12% protein. Feeding a low (12%) protein …

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Tolerance Studies To Wheat Streak Mosaic Virus In Winter And Spring Wheats, Fazal Rahman Jan 1972

Tolerance Studies To Wheat Streak Mosaic Virus In Winter And Spring Wheats, Fazal Rahman

Electronic Theses and Dissertations

Thirty-five winter and fourteen spring wheat varieties were evaluated for their reaction to wheat streak mosaic virus during 1969-1970 and 1970-1971. Plants were mechanically inoculated and the effects of virus were measured, relative to the control plots, in regards to seed yield, protein percentage, plant height, test weight, 1000-seed weight, number of tillers per plant, number of heads per tiller, number of seeds per head, and number of plants in the 2-foot subplot. Varieties were compared visually for their susceptibility to the virus in terms of percentage infection and severity of symptoms. Seed yield, plant height, test weight, 1000-seed weight, …

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Bionomics Of Mallophaga Of Sharp-Tailed Grouse In South Dakota, Major L. Boddicker Jan 1972

Bionomics Of Mallophaga Of Sharp-Tailed Grouse In South Dakota, Major L. Boddicker

Electronic Theses and Dissertations

The ecologies of chewing lice (Insecta:Mallophaga) which parasitize sharp-tailed grouse, Pedioecetes phasianellus, were studied in southwestern South Dakota from 1964 to 1967. Five hundred twenty-eight hens, cocks and chicks were collected and examined for louse damage. Louse populations were monitored each month from December, 1964, to September, 1967. Five louse species which infested grouse in the study area were Goniodes nebraskensis Carriker, Amyrsidea megalosoma Overgaard, Lagopoecus perplexus Kellogg and Chapman, Goniocotes chrysocephalus and Lipeurus maculosis Clay. Goniodes nebraskensis fed on feather parts and skin debris and was found to have seasonally fluctuating populations. Cocks carried peak populations of 250 lice/host …

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The Role Of Rainfall Impact And Surface Flow In Soil Detachment And Transport, Robert Alan Young Jan 1972

The Role Of Rainfall Impact And Surface Flow In Soil Detachment And Transport, Robert Alan Young

Electronic Theses and Dissertations

Soil erosion caused by rainfall is a very complex physical process. To evaluate the mechanism of erosion so that an assessment can be made of the extent to which it may be controlled necessarily begins with an understanding of the basic fundamental factors involved. The purpose of this study involves the development of an insight of the relative importance of the roles played by various contributors to the erosion process. Particular emphasis is placed on the contribution of rainfall detached soil to total soil loss. Three soil types, Barnes loam, Crofton silt loam and Central sandy loam, were prepared with …

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Physiological Regulation Of Cyclic Flowering In Flax, Aurora Salazar Hovland Jan 1972

Physiological Regulation Of Cyclic Flowering In Flax, Aurora Salazar Hovland

Electronic Theses and Dissertations

The flowering pattern of flax (Linum usitatissimum, L.) is cyclic in nature with periods of blossoming separated by periods of rest. To study the regulation of flowering cycles, four experiments were conducted. The first two dealt with nutritional aspects of cyclic flowering by imposing environmental stresses which conceivably might regulate flowering pattern nutritionally. The third and fourth experiments dealt with regulation from hormonal systems and included in vitro regulation of bud growth by growth regulators as well as characterization of endogenous hormonal systems by fluorimetry and bioassays. In the first experiment, the effects of light intensity, temperature, nitrogen and defoliation …

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The Effects Of Chlorpropamide In Diets Of Gravid Gilts On Embryo Survival, Fetal Weight And Fetal And Dam Blood Sugar Levels, Duane E. Wachholz Jan 1972

The Effects Of Chlorpropamide In Diets Of Gravid Gilts On Embryo Survival, Fetal Weight And Fetal And Dam Blood Sugar Levels, Duane E. Wachholz

Electronic Theses and Dissertations

Seventy-six primiparous, crossbred gilts averaging approximately 125 to 135 kg were used in a series of two experiments to determine the effects of chlorpropamide upon reproductive and blood criteria. The drug, fed at the rate of 1000 ppm (1816 mg per day) and 3000 ppm (5448 mg per day), was included in a 14% protein basal diet from the day following breeding until gilts were sacrificed after 60 or 95 days of gestation. The 515 fetuses collected from these gilts were used to obtain information about the effects of chlorpropamide on individual weights and blood glucose and fructose levels. Data …

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Northeast Research Station Watertown, South Dakota Annual Progress Report, 1971, Agricultural Experiment Station, Plant Science Department Dec 1971

Northeast Research Station Watertown, South Dakota Annual Progress Report, 1971, Agricultural Experiment Station, Plant Science Department

Agricultural Experiment Station and Research Farm Annual Reports

This is the 1971 annual progress report for the Northeast Research Station in Watertown, Garden CIty, and Whetstone Valley, South Dakota. This report is issued by the South Dakota Agricultural Experiment Station and South Dakota State University. This report includes information on the 1971 crop season, fertility and cultural practice experiments, soil and water loss, small grain and flex herbacide screening, insect control results, fertilizer rates for potatoes, small grain trials.

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Southeast Research Experiment Farm Annual Progress Report, 1971, Agricultural Experiment Station Dec 1971

Southeast Research Experiment Farm Annual Progress Report, 1971, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This is the 1971 progress report for the Southeast Research Farm, Agricultural ExperimentStation at Menno, South Dakota State College. This document represents the research conducted at the Station during the 1971 crop season including: weather data, corn trials and testing, fertilizer experiments, corn pest control , soybean research and testing, grain sorghum trials, alfalfa management, sunflower variety test, and cattle management.

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South Central Research Farm Annual Progress Report, 1971, Agricultural Experiment Station, Plant Science Department Dec 1971

South Central Research Farm Annual Progress Report, 1971, Agricultural Experiment Station, Plant Science Department

Agricultural Experiment Station and Research Farm Annual Reports

This is the 1971 report for the Agricultural Experiment Station at the South Central Research Farm. This report includes weather data, small grain variety testing, specialty crop testing, sorghum testing, grass testing, management, tillage, and cultural practices, fertilizer studies, and crop diseases and their control.

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Farm Managerial Characteristics Scales : A Supplement To Experiment Station Technical Bulletin 30, South Dakota Agricultural Experiment Station, Department Of Economics, South Dakota State University Oct 1971

Farm Managerial Characteristics Scales : A Supplement To Experiment Station Technical Bulletin 30, South Dakota Agricultural Experiment Station, Department Of Economics, South Dakota State University

Agricultural Experiment Station Agricultural Economics Pamphlets (1941-1991)

This publication contains material that supplements data and analysis in South Dakota Experiment Station Technical Bulletin 30. It is necessary to examine a copy of that publication to follow the material in this publication. The material in this publication is composed of the scales and questions that were selected and developed for analysis of Farmers Home Administration and Production Credit Association borrowers. The presentation also includes statistical coefficients and, where involved, specific methodology used in developing new scales. In the first three sections of this publication questions comprising validated scales are presented with questions and new scales which were developed …

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Levels Of Diethylstilbestrol And Types Of Protein Supplements In Ground Ear Corn Diets For Finishing Cattle, L. B. Embry Oct 1971

Levels Of Diethylstilbestrol And Types Of Protein Supplements In Ground Ear Corn Diets For Finishing Cattle, L. B. Embry

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

Results of numerous experiments have shown that diethylstilbestrol at 10 mg. daily in the feed of implanted at 30 to 36 mg. improves weight gains and feed efficiency of feedlot cattle. More recently it has been reported that feeding more than 10 mg. daily to heavier cattle results in further stimulation of weight gains and feed efficiency. Feeding of 20 mg. per head daily of diethylstilbestrol is now cleared for feedlot cattle above 750 lb.

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Can Beef Quality Be Evaluated?, W. J. Costello, R. J. Berns Oct 1971

Can Beef Quality Be Evaluated?, W. J. Costello, R. J. Berns

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

Beef quality is important to the consumer. She wants to serve tender, juicy, tasty beef to her family each time she serves it. If she can consistently serve quality beef, she will serve beef frequently. If she finds that she cannot consistently serve quality beef cuts, she will serve something else. For that reason, beef quality becomes important to every one along the production line between the brood cow and the consumer.

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Pine Sawdust As A Roughage Replacement In Cattle Finishing Diets, A. L. Slyter, L. D. Kamstra Oct 1971

Pine Sawdust As A Roughage Replacement In Cattle Finishing Diets, A. L. Slyter, L. D. Kamstra

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

Two lots of 12 heifers each were full fed daily one of two diets for 115 days to study the effect of sawdust replacement of ground alfalfa in a finishing diet on the performance and carcass characteristics of beef heifers. Diet composition is shown in table 1. Trace mineral salt and dicalcium phosphate were provided free choice.

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Value Of Shelter For Growing And Finishing Cattle, L. B. Embry, R. M. Luther, J. F. Fredrikson Oct 1971

Value Of Shelter For Growing And Finishing Cattle, L. B. Embry, R. M. Luther, J. F. Fredrikson

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

In an experiment which involved a study of sulfur additions to supplements with high levels of urea fed with corn silage and with ground ear corn silage and with ground ear corn, four diet treatments were replicated with inside or outside feeding. Results for this aspect of the experiment are summarized for this report.

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Relative Position Of Farmer-Feeders In The Increasingly Competitive Cattle Feeding Business, D. G. Cox Oct 1971

Relative Position Of Farmer-Feeders In The Increasingly Competitive Cattle Feeding Business, D. G. Cox

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

Farmer-feeders can potentially compete with anyone in the cattle feeding business. They have traditionally had many built-in advantages. By feeding the cattle on the farm where the grain and roughage are grown, drying, handling, shrinkage and transportation costs are reduced, and returns can be increased per acre by being able to market roughages and silages through cattle. In addition, there are fewer people obtaining a profit out of both the cattle and the feed when cattle are fed at the source of the feed. Another plus factor that will become increasingly important is that pollution is not as big a …

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Feedlot Herd Health Program, James H. Bailey Oct 1971

Feedlot Herd Health Program, James H. Bailey

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

The first two weeks in the feedlot are the most critical for cattle. Respiratory diseases are most apt to show up during the time the cattle are making adjustments to their new environment, feeding practices, etc. The effects of stress before and during shipping become evident at this time.

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Nutritional Quality Control And Feedbunk Management Of Feedlot Cattle, Donald Gill Oct 1971

Nutritional Quality Control And Feedbunk Management Of Feedlot Cattle, Donald Gill

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

Small errors in the nutrition and management of feedlot cattle frequently spell the difference between success and failure as a cattle feeder. Some frequently insignificant appearing factors may at times allow cost of gain to increase up to $4 to $5 per hundredweight.

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Performance Of Calves Fed Chlortetracycline-Sulfamethazine During Feedlot Adaptation Followed By Chlortetracycline, P. J. Thiex, L. B. Embry Oct 1971

Performance Of Calves Fed Chlortetracycline-Sulfamethazine During Feedlot Adaptation Followed By Chlortetracycline, P. J. Thiex, L. B. Embry

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

This experiment was conducted to determine the effects of supplementing calves with a chlortetracycline-sulfamethazine combination for 4 weeks following weaning. Chlortetracycline was then fed at 70 mg. daily during a growing phase when the calves were fed a high-roughage diet.

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An Investigation Into Possible Problems Arising From Repeal Of The Personal Property Tax In South Dakota, Ardelle Lundeen, Allyn O. Lockner Oct 1971

An Investigation Into Possible Problems Arising From Repeal Of The Personal Property Tax In South Dakota, Ardelle Lundeen, Allyn O. Lockner

Agricultural Experiment Station Agricultural Economics Pamphlets (1941-1991)

There is considerable pressure in South Dakota, as in many states at the present time, for tax relief or tax reform. Much of this concern is directed toward the type of taxes that most local governments and school districts rely on for the major portion of their operating funds. In South Dakota property taxes account for about 69 percent of local government revenue compared to a national average of 45 percent(1). As costs of government continue to rise, the burden on property owners becomes more onerous. The search for means of relief for the property owner continues. One method that …

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Complying With Feed Additive And Drug Withdrawl Periods, D. G. Fox, J. H. Bailey Oct 1971

Complying With Feed Additive And Drug Withdrawl Periods, D. G. Fox, J. H. Bailey

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

Most drugs are accumulated in excretory organs such as the kidneys and liver , and they are found in higher levels for a longer time in these organs than in other tissue. Due to a continuous excretion of the drugs from these organs, tissue levels are usually rapidly reduced after the drug is no longer fed or injected. The rate of excretion of a drug and its end products from animal tissues must be established before it can be considered for approval by the Food and Drug Administration. Then withdrawal periods that are sufficiently long enough to permit complete or …

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Fifteenth Annual Cattle Feeders Day, Animal Science Department Oct 1971

Fifteenth Annual Cattle Feeders Day, Animal Science Department

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

These are the complete proceedings of the fifteenth annual Cattle Feeders Day held on October 1, 1971 at South Dakota State University.

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Pine Sawdust As A Roughage Replacement In Feeder Cattle Diets, A. L. Slyter, L. D. Kamstra Oct 1971

Pine Sawdust As A Roughage Replacement In Feeder Cattle Diets, A. L. Slyter, L. D. Kamstra

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

Eight lots, five or six heifers each, (42 heifers total) were fed one of four diets for 119 days to study the effect of sawdust inclusion in a growing diet on the performance of feeder calves. The diets were alfalfa-concentrate, sawdust-concentrate, corn silage and sawdust silage. (See table 1 for specific diet composition). Trace mineral salt and dicalcium phosphate were fed free choice and vitamin A was supplemented to provide a calculated 10,000 to 12,000 I.U. per head per day. Brome-alfalfa loose hay was provided for the first week during adaptation to the experimental diets.

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Dry And High-Moisture Grain Fed Whole Or Rolled With Hay Or Haylage In Cattle Finishing Diets, J. D. Burkhardt, L. B. Embry Oct 1971

Dry And High-Moisture Grain Fed Whole Or Rolled With Hay Or Haylage In Cattle Finishing Diets, J. D. Burkhardt, L. B. Embry

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

In a previous experiment (A.S. Series 70-20 ) , steers were fed dry or reconstituted high-moisture corn grain , whole or rolled , at 1 lb . per 100 lb . of body weight with alfalfa-brome hay or reconstituted haylage to appetite from weights of about 500 to 825 lb . Higher rates of gain with lower feed requirements were obtained with high-moisture corn and haylage than from dry corn and hay. The greatest benefits from the moist feeds resulted when high-moisture corn and haylage were fed together. There appeared to be a slight advantage for rolling the corn under …

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Weaning Age And Management Systems For Fall Born Beef Calves, William Mccone Oct 1971

Weaning Age And Management Systems For Fall Born Beef Calves, William Mccone

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1971

Twenty-eight registered Angus and Hereford cows calved in September, 1970. The cows calved on pasture and remained on pasture until late November. From November 10 to December 28 the cows were bred for 1971 and started on a self-fed diet. The remaining 14, or one-half of the calves, were allowed to continue nursing the cows, but the calves also had access to calf creep with the same diet used for the weaned calves. At the start of the experiment the calves were randomly divided by sex, breed and age. At this time, December 30, 1970, the average age of all …

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