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Full-Text Articles in Life Sciences

1991 South Dakota Beef Report, Department Of Animal And Range Sciences, South Dakota State University, Agricultural Experiment Station, South Dakota State University, Cooperative Extension Service, South Dakota State University Jan 1991

1991 South Dakota Beef Report, Department Of Animal And Range Sciences, South Dakota State University, Agricultural Experiment Station, South Dakota State University, Cooperative Extension Service, South Dakota State University

South Dakota Beef Report, 1991

This is the complete 1991 South Dakota Beef Report.


Use Of A Simulation Model To Evaluate The Influence Of Reproductive Performance And Management Decisions On Net Income In Beef Production, L. A. Werth, S. M. Azzam, Merlyn K. Nielsen, J. E. Kinder Jan 1991

Use Of A Simulation Model To Evaluate The Influence Of Reproductive Performance And Management Decisions On Net Income In Beef Production, L. A. Werth, S. M. Azzam, Merlyn K. Nielsen, J. E. Kinder

Faculty Papers and Publications in Animal Science

A stochastic dynamic model of reproduction and a deterministic cow-herd economic simulation model were used to evaluate how management decisions and reproductive performance interact to influence net income in a cow-calf operation (1,000 cows) for 1 yr of production. The stochastic model was used to determine herd performance when length of breeding season (45, 70, or 120 d) interacted with three postpartum intervals of an estrus (48, 65, or 90 d) and three conception rates at first service (60, 70, or 80%). Short, moderate, and long postpartum intervals were used to reflect differences in reproductive performance. In addition, replacement ...


Economic Effects Of Horn Fly (Diptera: Muscidae) Populations On Beef Cattle Exposed To Three Pesticide Treatment Regimes, Jerome Hogsette, David Prichard, Joseph Ruff Jan 1991

Economic Effects Of Horn Fly (Diptera: Muscidae) Populations On Beef Cattle Exposed To Three Pesticide Treatment Regimes, Jerome Hogsette, David Prichard, Joseph Ruff

Publications from USDA-ARS / UNL Faculty

Horn flies could not be maintained below 50 per animal with sprays or dusts during a 21-wk study. However, weights of cows and calves and condition scores of cows were not influenced by suppression of Haematobia irritans (L.) populations. Results show that cattle in northwest Florida can tolerate average populations of >200 flies for 70 d with no adverse economic effects. Spray treatments providing the best fly control were Lintox-D and Ra-Vap. The most economical products for use were Del-Tox, Lintox-D, and Ra-Vap.


The Economics Of Food Safety: An Experimental Approach , Seung Youll Shin Jan 1991

The Economics Of Food Safety: An Experimental Approach , Seung Youll Shin

Retrospective Theses and Dissertations

Food safety issues have received increased attention from scientific and consumer groups alike in recent years. Pathogenic microbiological agents have been shown to be a major contributor to food-borne illnesses in the United States. The presence and cost of these pathogens has become a major issue for policy makers, consumers, and producers;Estimated economic losses to society attributable to food-borne diseases have been large. These estimated losses usually have been based on direct consumer losses and likely represent an underestimation of the true economic costs. Morbidity costs, such as consumers' willingness to pay (WTP) to reduce their chance of becoming ...


A Methodology To Evaluate The Welfare Effects Of Alternative Agricultural Price Policies In Urban Indonesia , Justo Manrique-Gutierrez Jan 1991

A Methodology To Evaluate The Welfare Effects Of Alternative Agricultural Price Policies In Urban Indonesia , Justo Manrique-Gutierrez

Retrospective Theses and Dissertations

The presentation of a theoretically sound and consistent methodology that could help policymakers to evaluate the welfare effects of alternative price policies was the focus of this Dissertation work. The proposed methodology had three basic stages: (1) classification of households in income groups; (2) estimation of demand systems for each of the newly formed income groups; and (3) measurement of welfare changes by means of estimating compensating variation measures from the underlying cost functions;The classification of households in income groups was based on an indepth understanding of the behavior of households as it relates to the acquisition of goods ...


Three Essays In Demand Analysis , Anuradha Akkaraju Vissa Jan 1991

Three Essays In Demand Analysis , Anuradha Akkaraju Vissa

Retrospective Theses and Dissertations

In this study, flexible representation of consumer demand systems is investigated within the framework afforded by duality in consumer theory. The first essay examines the market situation where supplies are inelastic and prices must adjust to clear the market, a situation that arises for most agricultural commodities, particularly for perishable commodities. A price dependent or inverse demand system can reflect such a market situation. Two flexible inverse demand systems are proposed. The first of these is a linear inverse demand system (LIDS) derived from a flexible specification of a distance function, and presents a particularly convenient system of linear equations ...


A Feasibility Study Of Swine Producer Management Cooperatives, Alan L. Vontalge Jan 1991

A Feasibility Study Of Swine Producer Management Cooperatives, Alan L. Vontalge

Retrospective Theses and Dissertations

No abstract provided.


Resource Adjustments, Dynamic Price Responses, And Research Impacts In Us Agriculture, 1950-1982 , Perry Warjiyo Jan 1991

Resource Adjustments, Dynamic Price Responses, And Research Impacts In Us Agriculture, 1950-1982 , Perry Warjiyo

Retrospective Theses and Dissertations

A multioutput model is developed within the dynamic duality of the adjustment cost theory to analyze resource adjustments, dynamic price responses, and research impacts in U.S. agriculture during the post-war period. The model is rich enough to incorporate both the slow adjustment nature of some farm resources and the role of public and private research in U.S. agriculture. The resource adjustments are investigated for automobiles/trucks, tractors, equipment, service structure, land, and labor. Using state-level data from 1950-1982, the results show that these inputs are best characterized as quasi-fixed inputs. The dynamic price responses and research impacts are ...


U.S. Livestock Production And Factor Demand: A Multiproduct Dynamic Dual Approach, K. Eswaramoorthy Jan 1991

U.S. Livestock Production And Factor Demand: A Multiproduct Dynamic Dual Approach, K. Eswaramoorthy

Retrospective Theses and Dissertations

There is a need for modeling livestock production and factor use incorporating the interlinked dynamics of breeding herd adjustments in a theoretically consistent manner. Therefore, a multiple input-multiple output theoretical model is developed based on the adjustment cost hypothesis of production relationship involving sluggish adjustments of quasi-fixed inputs. Employing the results of intertemporal analogue of Hotelling's lemma, a system of equations of optimal output supply, variable input demand, and quasi-fixed inputs (livestock breeding herds) investment is derived. Various issues like aggregation, expectation formation, and nonjointness in implementing this theoretical model are appraised.;A normalized quadratic value function is used ...


Rent-Seeking In Pesticide Policy , Sherry Jo Wise Jan 1991

Rent-Seeking In Pesticide Policy , Sherry Jo Wise

Retrospective Theses and Dissertations

A theoretical model of rent-seeking is tested by applying it to the case of pesticide policy. Two coalitions of interest groups are seen as competing to influence legislators in their decisions to regulate pesticides. The coalitions determine the optimal level of rent-seeking activities by balancing the expected benefits of rent-seeking with the costs of rent-seeking at the margin. Rent-seeking activities are found to be functions of the size of the coalition and the level of rent set by the regulator. Legislators determine the optimal level of rent by equating expected benefits and costs at the margin. The level of rent ...


Essays In Nonparametric Measures Of Changes In Taste And Hedging Behavior With Options , Yong Sakong Jan 1991

Essays In Nonparametric Measures Of Changes In Taste And Hedging Behavior With Options , Yong Sakong

Retrospective Theses and Dissertations

This dissertation consists of three self contained essays. The first develops and implements a method for measuring taste change that does not require any parametric estimation. The second essay shows how expected utility maximization problems can be solved when the distribution of prices or revenue is truncated. The third essay examines optimal hedging behavior of a firm faced with both price and output uncertainty, and who has access to both futures and options markets.


Dynamic Firm Behavior Under Uncertainty , Sergio Horacio Lence Jan 1991

Dynamic Firm Behavior Under Uncertainty , Sergio Horacio Lence

Retrospective Theses and Dissertations

This study examines and compares the behavior of forward-looking and myopic expected-utility-maximizing competitive firms. The first scenario analyzed is that of a speculative storing firm in the absence of forward markets. It is shown that there are important differences between forward-looking and myopic firms in that the former may store more or less than otherwise identical risk-neutral firms, whereas the latter will always store less than risk-neutral ones. If the forward-looking firm is constant absolute risk averse (CARA) and sufficiently risk averse, at low storage levels it will store more than if it were risk neutral. So long as the ...


G91-1053 Looking For Buy And Sell Signals From Charts, Lynn H. Lutgen Jan 1991

G91-1053 Looking For Buy And Sell Signals From Charts, Lynn H. Lutgen

Historical Materials from University of Nebraska-Lincoln Extension

The third in a series of nine on the basics of technical analysis, this NebGuide explains what to look for in commodity charts.

Producers always look for the ultimate: ever-accurate, foolproof, technical signals to tell what moves to make in the market. The problem is the markets are an ever-changing phenomenon; no one signal can predict prices with 100 percent accuracy.

This NebGuide is design to give readers a feel for different kinds of tecnical signals analysts look for to determine market direction. Major signals discussed are: key reversals, double and triple bottoms, head and shoulders (top and bottom), and ...


The Location Of The North American Cattle-Feeding Industry: A Nonspatial Modeling Approach, Shawn Arthur Hamilton Jan 1991

The Location Of The North American Cattle-Feeding Industry: A Nonspatial Modeling Approach, Shawn Arthur Hamilton

Retrospective Theses and Dissertations

No abstract provided.


Determination Of Optimal Crop Combinations On Zambian Farms: Incorporation Of Certainty And Risk Considerations In Mathematical Programming Models, Judith Nanyangwe Lufumpa Jan 1991

Determination Of Optimal Crop Combinations On Zambian Farms: Incorporation Of Certainty And Risk Considerations In Mathematical Programming Models, Judith Nanyangwe Lufumpa

Retrospective Theses and Dissertations

No abstract provided.


Regional Cattle Feeding: A Comparative Analysis Of Regional Production Costs Of Fed Beef Produced For The U.S. And Japanese Markets, Lee Sankey Jan 1991

Regional Cattle Feeding: A Comparative Analysis Of Regional Production Costs Of Fed Beef Produced For The U.S. And Japanese Markets, Lee Sankey

Retrospective Theses and Dissertations

No abstract provided.


Accounting For Yield Risk In Preharvest Commodity Pricing Decisions, Steven J. Monson Jan 1991

Accounting For Yield Risk In Preharvest Commodity Pricing Decisions, Steven J. Monson

Retrospective Theses and Dissertations

No abstract provided.