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

Digital Commons Network™

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

South Dakota State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 5071 - 5100 of 8049

Full-Text Articles in Entire DC Network

An Economic Analysis Of The Impacts Of Weather Modification On Crop And Livestock Production In Southeastern South Dakota, James W. Dunn Jan 1974

An Economic Analysis Of The Impacts Of Weather Modification On Crop And Livestock Production In Southeastern South Dakota, James W. Dunn

Electronic Theses and Dissertations

The procedure used for the study was the application of linear programming to an aggregate farm. The characteristics of this aggregate farm were determined from data compiled by the South Dakota Crop and Livestock Reporting Service, with assistance from Dr. Wallace Aanderud and Dr. Richard Rudel, both with the Economics Department at South Dakota State University. The method of an aggregate farm approach was used because the desired estimates are of an aggregate nature. The activities were limited to their actual historical limits, in order to obtain results as representative of the actual effects of weather modification as possible. This …

Go to article

Biological Control Of Musk Thistle, Carduus Nutans, In South Dakota, Dennis Morihara Jan 1974

Biological Control Of Musk Thistle, Carduus Nutans, In South Dakota, Dennis Morihara

Electronic Theses and Dissertations

Two sites in southeastern South Dakota were used in this study. Both sites supported unusually dense infestations of C. nutans and were chosen on that basis. Site A was located at an unoccupied farmstead in Minnehaha County, 2 miles S.W. of Crooks. This site was composed of 3 distinct infestations of musk thistle: (1) the first stand of thistles was approximately 2 x 9 m surrounded by Siberian elm, Ulmus pumila L., Conyza canadensis (L.) Cronquist (mare's tail) and a Bromus sp., probably B. inermis Leysser. The thistles in this area stood 2+ m tall at maturity. (2) The second …

Go to article

Gonadal Hormone Levels Prior To And Following Puberty In Straightbred And Crossbred Beef Heifers, Walter Ronald Parker Jan 1974

Gonadal Hormone Levels Prior To And Following Puberty In Straightbred And Crossbred Beef Heifers, Walter Ronald Parker

Electronic Theses and Dissertations

Five heifers from each of four breed groups (Angus x Angus, Charolais x Charolais and the two reciprocal crosses) were used in a study of gonadal hormone levels during the interval from 16 weeks before puberty to puberty (trial I). Puberty was defined as the first standing estrus. Two heifer calves from dams from each of the above breed groups and sired by a single Polled Hereford bull were used in a study of gonadal hormone levels from birth to weaning (trial II). Blood samples were collected at weekly intervals from trial I heifers before puberty and three times weekly …

Go to article

Color And Light Intensity Preferences Of Four Species Of Alate Cereal Aphids, Donald A. Dickmann Jan 1974

Color And Light Intensity Preferences Of Four Species Of Alate Cereal Aphids, Donald A. Dickmann

Electronic Theses and Dissertations

Color and light intensity preferences of 4 species of alate cereal aphids, the English grain aphid, Macrosiphum avenae (Fab.); oat bird-cherry aphid, Rhopalosiphum padi (L.); corn leaf aphid, R. maidis (Fitch); greenbug, Schizaphis graminum (Rondani); were tested under controlled conditions. No significant differences in color response were found between post-teneral (flight-active) and flight-exhausted alates of any species. Macrosiphum avenae, R. maidis, and S. graminum showed a distinct preference for yellow; R. padi usually preferred green. Alates of all species preferred high light intensities to low within the range tested (350-3500 ft-c). Preferred colors (yellow and green) were more important than …

Go to article

The Effects Of Gestation Metabolizable Energy Levels On Sow Productivity And Hematology, George W. Libal Jan 1974

The Effects Of Gestation Metabolizable Energy Levels On Sow Productivity And Hematology, George W. Libal

Electronic Theses and Dissertations

It has been estimated that of the potential ova shed by the sow on1y about 55% result in live pigs born. Reproductive inefficiency can occur as a result of oversupplying or undersupplying energy. Since 1959, the National Research Council has reduced its listed energy requirements for the gravid sow considerably. The studies reported herein were conducted to evaluate metabolizable energy (ME) levels for gestating sows at and below the recommended levels and measure their effect on sow productivity as well as sow hematology at various stages of reproduction. Two experiments, each consisting of three trials, were conducted. Experiment 1, two …

Go to article

Pine Needle (Pinus Ponderosa) Abortive Factor And Its Biological Determination, Carolyn A. Cogswell Jan 1974

Pine Needle (Pinus Ponderosa) Abortive Factor And Its Biological Determination, Carolyn A. Cogswell

Electronic Theses and Dissertations

A study was conducted to develop a reliable method to measure presence and quantity of the toxic factor in ponderosa pine (Pinus ponderosa) needles that interferes with normal maintenance of pregnancy in cattle. Special emphasis was given to biological assay sensitivity during embryo implantation and gestation in laboratory animals. The detrimental component was found to be present in both aqueous and acetone fractions prepared from ponderosa pine needles. There was a reduction in average rat litter size from bred rats fed either the aqueous or acetone pine needle extracts throughout pregnancy. Rats fed pine needle extracts from the winter pine …

Go to article

Corixidae (Water Boatmen) Abundance And Contribution To Littoral Zone Fish Forage In Lake Poinsett, South Dakota, Richard Lee Applegate Jan 1974

Corixidae (Water Boatmen) Abundance And Contribution To Littoral Zone Fish Forage In Lake Poinsett, South Dakota, Richard Lee Applegate

Electronic Theses and Dissertations

Corixids were sampled each week in littoral zone areas of Lake Poinsett during the open water seasons, April-October, in 1970, 1971, and 1972. Fish were sampled each week in littoral zone areas in 1970 and food habits studies were conducted to determine if fish predation would influence corixid population dynamics. Seven genera and 15 species of the family Corixidae were collected. Major indigenous species were Palmarcorixa buenoi Abbott, Trichocorixa borealis Sailer, Cenocorixa dakotensis (Hungerford), and Sigara conocephala (Hungerford). Species migrating to Lake Poinsett in the fall to overwinter were Sigara alternata (Say), S. solensis (Hungerford), S. bicoloripennis (Walley), Hesperocorixa vulgaris …

Go to article

The Decompostion Of Organic Matter In Two Midgrass Prairies In Western South Dakota, Venance H. Lengkeek Jan 1974

The Decompostion Of Organic Matter In Two Midgrass Prairies In Western South Dakota, Venance H. Lengkeek

Electronic Theses and Dissertations

All ecosystems have two basic biological components. One component is the autotrophic organisms which fix energy from the sun and use inorganic substances to create food. The other is the heterotrophic organisms which utilize the stored food of the autotrophs, rearrange it, and finally decompose the complex materials into simple inorganic compounds. The autotrophs, which are predominantly green plants, grow wherever the most sunlight is available, heterotrophs predominate wherever organic matter accumulates, primarily in the upper layer of the soil. Heterotrophs consist of consumers which feed on green plants and other organisms. Decomposers, chiefly bacteria and fungi that break down …

Go to article

The Economic Feasibility Of Confinement Feedlots And The Analysis Of Seasonal Marketing Variations For Feeder Cattle In South Dakota, Daniel W. Francke Jan 1974

The Economic Feasibility Of Confinement Feedlots And The Analysis Of Seasonal Marketing Variations For Feeder Cattle In South Dakota, Daniel W. Francke

Electronic Theses and Dissertations

South Dakota apparently produces an adequate quantity of feeders and feed grains to substantially increase slaughter cattle production. Furthermore, South Dakota prices for feed grain, roughage, and feeder cattle are equal to, or less than, the prices for these inputs in other areas where cattle feeding has flourished in recent years. It should also be determined how South Dakota farmers might increase fat cattle production. Therefore, in an attempt to explain South Dakota's slow cattle feeding growth and possibly help farmers in South Dakota and neighboring areas develop the cattle feeding industry, the following problems were researched. First, this area …

Go to article

A Quantitative Analysis Covering 60 Years Of Changing Patterns Of Land Use Along A Major Traffic Arterial In Sioux Falls, South Dakota, Virgil Clayton Sandvig Jan 1974

A Quantitative Analysis Covering 60 Years Of Changing Patterns Of Land Use Along A Major Traffic Arterial In Sioux Falls, South Dakota, Virgil Clayton Sandvig

Electronic Theses and Dissertations

Minnesota Avenue, a commercially zoned strip in Sioux Falls, South Dakota, referred to as an urban arterial by the City Planning Office of major arterial by Harlan Bartholomew and Associates, constitutes the study area. We are concerned in this study with a narrow (eighty feet of right of way, twenty-seven city blocks long) piece of public land and its contact with both private and public parcels of property. Minnesota Avenue in its entirety extends from South Dakota Highway 38 on the north through the approximate center of the city of Sioux Falls joining Interstate 229, a circumferential route on the …

Go to article

The Effect Of Market Weight And Ration Concentrate Level On Carcass Traits Of Bulls, Heifers And Steers, Peter B. Smith Jan 1974

The Effect Of Market Weight And Ration Concentrate Level On Carcass Traits Of Bulls, Heifers And Steers, Peter B. Smith

Electronic Theses and Dissertations

Increasing worldwide demand for animal protein, growing pressure on the available cereal grains by a multiplying world population and greater availability of United States agricultural products worldwide make it imperative that beef volume and production efficiency increase. Consumer demand for a lean, high quality, trim product dictates production of rapid growing, efficient beef animals with minimum fat deposition at market weights. In the face of increasing demand, governmental constraints in the form of economic controls, ecological considerations and restrictions in the use of antibiotics and growth promoting agents force the beef industry to examine and improve production efficiency. Currently, packers …

Go to article

Sdsu Collegian, December 19, 1973, Student Association Of South Dakota State University Dec 1973

Sdsu Collegian, December 19, 1973, Student Association Of South Dakota State University

The Collegian Archive : 1970 to 1979

Vol. 82, No. 16

Go to article

South Dakota State University Graduation Exercises, December 15, 1973, Brookings, South Dakota, South Dakota State University Dec 1973

South Dakota State University Graduation Exercises, December 15, 1973, Brookings, South Dakota, South Dakota State University

Commencement Programs

Please be advised that the individuals listed in the program do not officially confirm meeting the graduation requirements. Honorary marshals for the Fall 1973 Graduation Exercises are Emery Bartle, Professor Emeritus of Dairy Science, and Richard D. Anderson, Professor Emeritus of Engineering Shops. Professor of English, Jean D. Walz, will deliver the commencement address titled, "Searching for Identity and Relevance." President Hilton M. Briggs will confer degrees and present diplomas.

Go to article

Sanitary Landfills… The Situation And Legal Requirements, Cooperative Extension South Dakota State University Dec 1973

Sanitary Landfills… The Situation And Legal Requirements, Cooperative Extension South Dakota State University

SDSU Extension Fact Sheets

This fact sheets deals with the amount and type of solid waste produced by South Dakotans and the legal requirements to dispose of it.

Go to article

Southeast South Dakota Experiment Farm Annual Progress Report, 1973, Agricultural Experiment Station Dec 1973

Southeast South Dakota Experiment Farm Annual Progress Report, 1973, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This thirteenth annual report of the research program at the Southeast South Dakota Experiment Farm has special significance for those engaged in agriculture and the agriculturally related businesses in the nine county area of southeast South Dakota. Reports in this document include information on: temperatures and precipitation, corn breeding and performance, soybean research and planting, crop rotation, beef steers, and swine production.

Go to article

Seventeenth Annual Swine Day, Animal Science Department Nov 1973

Seventeenth Annual Swine Day, Animal Science Department

South Dakota Swine Field Day Proceedings and Research Reports, 1973

These are the complete proceedings of the seventeenth annual South Dakota Swine Field Day held on November 15, 1973 at South Dakota State University.

Go to article

Interrelationships Of Birth Weight, Farrowing Order, Sex, Stillbirths And Farrowing Time Interval Of Pigs, G. W. Libal, R. L. Janssen, R. C. Wahlstrom Nov 1973

Interrelationships Of Birth Weight, Farrowing Order, Sex, Stillbirths And Farrowing Time Interval Of Pigs, G. W. Libal, R. L. Janssen, R. C. Wahlstrom

South Dakota Swine Field Day Proceedings and Research Reports, 1973

Little information is available concerning conditions present at the time of parturition in swine. This study was conducted to determine whether the succession at birth was related to weight at birth, sex, condition (whether alive or stillborn) and time interval between pigs. Possible relationships between birth weight, sex, farrowing order, farrowing interval and stillbirths were also studied.

Go to article

Lysine And Methionine Supplementation Of Growing-Finishing Swine Diets, Richard C. Wahlstrom, George W. Libal Nov 1973

Lysine And Methionine Supplementation Of Growing-Finishing Swine Diets, Richard C. Wahlstrom, George W. Libal

South Dakota Swine Field Day Proceedings and Research Reports, 1973

The objectives of this experiment were to determine the effects of lysine and methionine supplementation of 14% protein swine growing diets and 11% swine finishing diets on rate of gain, feed efficiency and carcass development.

Go to article

Effect Of Environment And Feeding Antibacterial Compounds During Early Growth On Performance On Growing-Finishing Pigs, Richard C. Wahlstrom, George W. Libal, Alan Vogel, Richard M. Luther Nov 1973

Effect Of Environment And Feeding Antibacterial Compounds During Early Growth On Performance On Growing-Finishing Pigs, Richard C. Wahlstrom, George W. Libal, Alan Vogel, Richard M. Luther

South Dakota Swine Field Day Proceedings and Research Reports, 1973

The objectives of this experiment were to study the value of several anti-microbial agents as feed additives when included in the diet of young weaned pigs for approximately 5 weeks and to compare the performance of pigs fed in an enclosed confinement building with those fed in an outside, open-front building.

Go to article

Protein Levels For Lactating Sows, G. W. Libal, R. C. Wahlstrom Nov 1973

Protein Levels For Lactating Sows, G. W. Libal, R. C. Wahlstrom

South Dakota Swine Field Day Proceedings and Research Reports, 1973

The major objective of lactation feeding is to provide the lactating sow with proper nutrients to allow her to produce maximum quantities of milk resulting in heavy weaning weights of pigs. There is also evidence to show that protein levels of feed during gestation have an influence on lactation performance. The lactating sow fed ad libitum during lactation consumes a considerable quanitiy of feed and, at today's feed prices, this represents a large cost. If protein percentage of the lactation diet was reduced, savings in sow feed cost could be realized. The trials reported herein were designed to study the …

Go to article

Effect Of Protein Consumption By The Growing Gilt Upon Puberty, Ovulation And Reproduction, G. W. Libal, R. C. Wahlstrom Nov 1973

Effect Of Protein Consumption By The Growing Gilt Upon Puberty, Ovulation And Reproduction, G. W. Libal, R. C. Wahlstrom

South Dakota Swine Field Day Proceedings and Research Reports, 1973

Low protein diets have been shown to significantly decrease daily weight gain of the growing pig, resulting in the pig reaching market weight at a later age. At the same time body weight has been credited with influencing the age at which gilts reach puberty and exhibit their first estrus. If replacement gilts could be fed a low protein diets during the growing period resulting in a smaller more practical sow without affecting puberty or subsequent reproductive performance, feed costs could be significantly reduced. The experiment reported herein was designed to determine the effect of a 14% protein diet and …

Go to article

Energy Sources In Starter Diets For Early Weaned Pigs, Leon J. Reiner, George W. Libal, Richard W. Wahlstrom Nov 1973

Energy Sources In Starter Diets For Early Weaned Pigs, Leon J. Reiner, George W. Libal, Richard W. Wahlstrom

South Dakota Swine Field Day Proceedings and Research Reports, 1973

Cereal grains constitute the major percentage of swine diets. Although they are used mainly as energy sources, these grains also supply a considerable amount of protein to the diet. With increased feed prices, much interest has been expressed in alternate ingredient sources in swine diets and combinations of ingredients that will be palatable and furnish the nutrients required. Starter diets for young weaned pigs are the most expensive diets because of the higher nutrient requirement at this stage of the life cycle. Therefore, this experiment was conducted to evaluate the performance of young weaned pigs fed different grains, alone and …

Go to article

A Comparison Of Opaque-2, Double Mutant And Normal Corn In Diet, Richard C. Wahlstrom, George W. Libal Nov 1973

A Comparison Of Opaque-2, Double Mutant And Normal Corn In Diet, Richard C. Wahlstrom, George W. Libal

South Dakota Swine Field Day Proceedings and Research Reports, 1973

The objective of this experiment was to compare the performance of finishing pigs fed normal, opaque-2 or double mutant corn without supplemental protein with that of pigs fed a normal corn-soybean meal diet from 130 to 200 lb. in weight.

Go to article

Blood Meal As A Protein Supplement For Growing-Finishing Pigs, Richard C. Wahlstrom, George W. Libal, Steve Robbins Nov 1973

Blood Meal As A Protein Supplement For Growing-Finishing Pigs, Richard C. Wahlstrom, George W. Libal, Steve Robbins

South Dakota Swine Field Day Proceedings and Research Reports, 1973

The objective of the experiment reported herein was determine if blood meal as it is now produced could be used as a partial substitute for soybean meal in diets for growing-finishing pigs.

Go to article

All-Corn Ration For Brood Sows During Gestation, G. W. Libal, R. C. Wahlstrom Nov 1973

All-Corn Ration For Brood Sows During Gestation, G. W. Libal, R. C. Wahlstrom

South Dakota Swine Field Day Proceedings and Research Reports, 1973

Recent research has shown that the protein requirement for the brood sow may not be as great as once thought. Some work has indicated that all-corn diets with no supplementary protein may be satisfactory during gestation. Previous results from this station utilizing oats during gestation with no supplementary protein have been encouraging. The research reported herein was conducted to evaluate corn, a feedstuff low in protein and of relatively poor protein quality supplemented only with minerals, as a complete diet for gestating sows.

Go to article

Effect Of Lactation Feeding Level On Sow And Pig Performance, G. W. Libal, R. C. Wahlstrom Nov 1973

Effect Of Lactation Feeding Level On Sow And Pig Performance, G. W. Libal, R. C. Wahlstrom

South Dakota Swine Field Day Proceedings and Research Reports, 1973

Milk production of the sow during lactation is influenced by feed consumed, condition of the sow, length of lactation and number of pigs she is nursing. Previous work at this station has shown and economic advantage for feeding sows ad libitum vs. limiting feed during lactation if sale weight of the sow is taken into consideration. The experiment reported herein is an attempt to confirm these fidnings and apply present costs and prices to the data to determine the most economical feeding management during lactation.

Go to article

Amino Acid Supplementation Of Opaque-2 Corn For Growing Pigs, Reid V. Merrill, Richard C. Wahlstrom, George W. Libal Nov 1973

Amino Acid Supplementation Of Opaque-2 Corn For Growing Pigs, Reid V. Merrill, Richard C. Wahlstrom, George W. Libal

South Dakota Swine Field Day Proceedings and Research Reports, 1973

The purpose of this research was to study the adequacy of the essential amino acids lysine, methionine, typtophan, threonine and isoleucine in opaque-2 corn diets for young pigs. Rate of gain, feed efficiency and plasma amino acid levels were criteria used to evaluate the diets.

Go to article

Why Add Vitamin Supplements To Diets Of Growing-Finishing Pigs, Richard C. Wahlstrom, George W. Libal, Alan Vogel, Richard M. Luther Nov 1973

Why Add Vitamin Supplements To Diets Of Growing-Finishing Pigs, Richard C. Wahlstrom, George W. Libal, Alan Vogel, Richard M. Luther

South Dakota Swine Field Day Proceedings and Research Reports, 1973

A great deal of variation appears to exist in the amount of supplemental vitamins that are added to diets for growing-finishing pigs. Many pigs are fed diets that do not contain any supplemental vitamins, others receive diets containing levels of vitamins that meet the recommendations of the National Research Council (NRC) and still others are fed diets containing levels of vitamins considerably higher that the NRC recommended levels. This experiment was conducted to determine the value, if any, of recommended and excess levels of vitamins in growing-finishing pig diets.

Go to article

Feed Additives In Swine Diets, Richard C. Wahlstrom, George W. Libal, Alan Vogel, Richard M. Luther Nov 1973

Feed Additives In Swine Diets, Richard C. Wahlstrom, George W. Libal, Alan Vogel, Richard M. Luther

South Dakota Swine Field Day Proceedings and Research Reports, 1973

An experiment was conducted at the Cornbelt Research and Extension Center near Beresford, South Dakota, to determine the effectiveness of Mecadox and other feed additives fed for a 5-week period, to study the effect of withdrawal of feed additives at this time on future growth performance and to study the effect of the antibiotic tylosin when fed during the finishing period.

Go to article

Growth Stimulant Substitutes For Stilbestrol, James J. O'Connell Nov 1973

Growth Stimulant Substitutes For Stilbestrol, James J. O'Connell

South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1973

No abstract provided.

Go to article

First Prev Next Last