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Agribusiness Management In Utah Dairies, Rick L. Hirschi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis outlines the theoretical factors impacting dairy profitability. The theoretical portion includes: a general review of production and profit maximization theory, a review of related studies, and an outline of the variables impacting dairy profitability.

An empirical study follows using data gathered from three applied technology centers in Utah in conjunction with dairy herd improvement production records for the farms where these data were available. The empirical section includes a synopsis of the methods and procedures used to collect and analyze the data. Regression analysis was used to determine the significant production and financial factors influencing returns per cow; …

Do Prospective Ratings Correct Retrospective Distortions Based On Negative Social Stereotypes Of Premenstrual Syndrome?, Mary L. Stone

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Daily Assessment Form (OAF) retrospectively assessed symptoms of late luteal phase dysphoric disorder (LLPDD), both at the beginning and at the end of a 2-month time interval. Ninety-four women between the ages of 18 and 45 entered the study. Half of the subjects viewed a negative-case, stereotypic presentation of LLPDD prior to the pretest. sixty-eight subjects qualified on the pretest to complete the study. Half of the remaining no-case subjects and half of the remaining negative-case subjects completed 8 weeks' prospective ratings via the OAF. Forty-eight subjects remained to complete the posttest at the end of that time interval. …

Factor Analytic Study Of Spatial Abilities In Second-Grade, English-Speaking Navajo And Non-Navajo Children, Laurie Sullivan-Sakaeda

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was conducted to continue the investigation of apparent differences in cognitive abilities between Navajo Indian children and non-Navajo children. Subjects were 248 second-grade students, ranging from 7 to 9 years old. The Navajo sample lived in the Shiprock, New Mexico, area of the Navajo Indian Reservation, and the non-Navajo sample lived on the east side of Salt Lake City, Utah. Data were collected using six tests designed to measure spatial abilities in primary grade children. Results indicated that the non-Navajo children scored significantly higher on two individual tests and on the total test score under timed conditions, with …

Differential Parental Participation In A Comprehensive Early Intervention Project: Is More Active Better?, Gary Percival

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The current study examined the level of participation by families who have been involved between 1 and 3 years with the Community-Family Partnership (CFP) project. The CFP project is 1 of 34 Comprehensive Child Development Projects funded by the Administration for Children, Youth, and Families through the Head Start Bureau. The CFP makes available comprehensive, on-going services to enrolled families. Twenty-six families were identified as the Low Participation Group. Twenty-three families were identified as the High Participation Group. Children from each group were tested using the Battelle Developmental Inventory on a yearly basis. Results of a repeated measures ANOVA indicated …

Influences Of Nitrogen Supply And Elevated Co2 On Nitrogen Consumption, Nitrogen Loss, Tissue Nitrogen Concentration, And Yield Of Hydroponic Wheat, Karl B. Ritchie

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Wheat was grown hydroponically for 23 days (early boot stage) in a controlled environment at NO₃^- concentrations of 100 and 1000 μmol and CO₂ levels of 360 and 1200 μmol mo1^-1. Nitrogen consumption and transpiration were measured daily. Tissue nitrogen concentration, total biomass, and percent root mass were measured at harvest. Nitrogen recovery and nitrogen use efficiency were calculated. Elevated CO₂ increased nitrogen consumption of the 100 μmol NO₃^- treatment by 13.6% and the 1000 μmol NO₃^- treatment by 21.3%. These increases were particularly evident during …

Effects Of Soluble Calcium-To-Protein Ratio On Age Gelation Of Ultra, Je Hong Ryue

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Reverse osmosis (RO) and ultrafiltration (UF) retentates were ultra-high temperature (UHT) processed and compared for storage life at room temperature. Viscosity studies indicated that UHT-treated, RO retentate delayed age gelation longer than UF retentate at the same total solids level (26% TS). When compared at 6.4% protein level (2x RO vs 2.7x UF where x=ratio of the feed volume to concentrate volume), the storage life for both RO and UF retentates was about 6 to 8 months.

Sodium hexametaphosphate (SHMP) and disodium phosphate (DSP) at 1, 3, 5, 10, and 20 mM concentrations were incorporated prior to UHT processing …

Pantothenate-P-Nitroanilide As A Substrate For Pantetheinase Assay, Robert T. Davidson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Pantothenate-p-nitroanilide has been synthesized for use as a substrate in a continuous spectrophotometric assay of pantetheinase activity monitoring absorbance at 410 nm. Pantothenate-p-nitroanilide is a crystalline compound with a molecular weight of 338.0 and a melting point of 146-149°C. Use of this substrate in the described assay is suitable for enzyme activity determination in high protein content media such as blood serum. Serum pantetheinase activity was determined for rats of varying pantothenate nutriture. Rats with mildly (but significantly, p < 0.05) lower serum pantothenate levels had significantly higher serum pantetheinase activities than the control group (6.24 nmol/min/ml ± 0.72 and 16. 16 nmol/min/ml ± 4. 14, respectively, p=0.0005).

Microstructural Changes In Casein Micelles During Acidification Of Skim Milk, Hongwen Du

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Pasteurized skim milk was acidified using glucono-δ-lactone (GDL) at 10, 20, 30, and 40°C or with 1.2% freeze-dried yogurt starter culture at 40°C. Milk coagulation was followed by measuring turbidity, curd firmness, particle size, and casein micelle microstructural changes using transmission electron microscopy .

The pH of milk was gradually lowered during acidification with GDL or starter culture. Acidification rate showed greater influence on turbidity change at 10°C than at 20, 30, or 40°C.

Average casein micelle size increased with decreasing temperature. The patterns of average micelle size versus pH were not affected by temperature. No great variation of average …

Uptake, Absorption, And Adsorption Kinetics Of Ferrous And Ferric Iron In Iron-Replete And Iron-Deficient Rats, Madhavi Ummadi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Various concentrations of ferrous and ferric iron solutions were held at room temperature for 60 min before they were assayed for ferrous iron, which may be unstable due to oxidation. The ferrous and ferric solutions (in pH 2 HCl) were maintained as such for 60 min without the use of chelators. There was no significant oxidation of ferrous iron. Also, four different levels of each ferrous and ferric iron were injected into proximal duodenal loops of rat intestine and uptake was determined at four different time intervals. Two iron-replete rats were assigned to each of the treatments. The in situ …

Fate Of Β-Lactoglobulin, Α-Lactalbumin, And Casein Proteins In Ultrafiltered Concentrated Milk After Ultra-High Temperature Processing, Mark Christopher Alleyne

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The problem of age gelation in ultra-high temperature (UHT) sterilized milk retentate (ultrafiltered 3x concentrated) is investigated in this work. Transmission electron microscopy (TEM), utilizing the microcube encapsulation technique and protocols for immunolocalization of milk proteins, provides insight into the phenomenon of age gelation of UHT-sterilized, ultrafiltered (UF) milk retentate. Primary antibodies (specific for the native as well as the complexed forms of milk proteins) and secondary antibodies (conjugated to gold probes) are used to elucidate the positions of the milk proteins in various samples of milk from the stage of milking through UHT sterilization and storage for 12 months, …

A Response Surface Study Of Extruded Corn Starch/Skim Milk Powder Blends, Sachin Singh

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Skim milk was ultrafiltered to three lactose/protein ratios and spray dried. The skim milk powder was extruded with pearled corn starch at different moisture contents, protein contents, lactose/protein ratios, and feed rates (control variables). Response surface methodology and a central composite in cube experimental design were used. This design required 30 experimental runs with 16 factorial points, 8 axial points, and 6 center points for replication. The physical and functional properties evaluated were expansion ratio, product temperature, bulk density, color, shear stress, viscosity, and water absorption index (response variables). Scanning electron microscopy was done to evaluate the microstructural attributes of …

Influence Of Ultra-High Temperature Process Parameters On Age Gelation Of Mille Concentrate, Mohamed A. Elhilaly

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this research was to investigate the effect of ultra-high temperature process parameters on age gelation of milk concentrate. Skim milk was concentrated to 2X (volume reduction) using reverse osmosis. The milk concentrate was preheated at 75 or 90°C for 20 or 50 s and UHT-processed at 138 or 145°C for 4 or 16 s. Sterilizing methods used were direct steam injection and indirect plate heat exchanger. The samples were aseptically collected in presterilized plastic containers and stored at 15 or 35°C. At 15°C storage temperature, the steam-injected samples gelled in 5 months when 4 s UHT time …

Effects Of Whey Protein Concentrate, Phosphate, And Sodium Hydroxide On Texture And Acceptability Of Turkey And Beef Rolls, Igor V. Moiseev

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Processed turkey rolls were prepared with 1 or 3% whey protein concentrates WPC-50 (pH=5.80), WPC-60 (pH=4.53) and WPC-75 (pH=6.85} containing 50, 60 and 75% protein along with controls (phosphate and no phosphate). Control rolls made with 0.5% phosphate had the highest bind strength, and sensory evaluation scores. Only WPC-75 (1%) was acceptable as a binding agent and flavor enhancer. WPC-60 reduced pink discoloration of rolls, but flavor, bind and cohesiveness scores were unacceptably low. WPC-50 was not an effective binding agent. In general, rolls made with 3% WPC had lower scores for intensity of turkey flavor.

Bind strength and sensory …

In Vivo Biopotency Evaluation Of Chromium-Containing Complexes, Jay Rulon Keller

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Seven chromium-containing complexes were tested for effects on blood glucose regulation, serum cholesterol levels, serum triglyceride levels, and body composition. The compounds included Cr picolinate, Cr chelidonate, chromate, Cr chelidamate, Cr arginate, nichrome, and Cr chloride.

The study was divided into two major sections, a rat study and a chicken study. In the rat study all seven chromium-containing complexes were tested. They were administered to the rats in four different testing periods at 1 ppm, 5 ppm, and 25 ppm of chromium. Methods of administration varied for each testing period. After the chromium compounds were administered, a glucose tolerance test …

Effects Of Nonfat Dry Milk, Whey Protein Concentrate, And Calcium Caseinate On Color And Texture Of Turkey Rolls, Brent Neeley Dobson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Two studies were conducted to evaluate the effects of milk solids on restructured and emulsified turkey rolls. the milk solids used were nonfat dry milk (NFDM), whey protein concentrate (WPC), and calcium caseinate (CC). Turkey rolls consisted of 100% breast meat or 90:10 or 70:30 breast-to-thigh, salt (1%), water (10%), internal or cluster fat (10%), and 3% of various milk solids (WPC, NFDM, CC).

The objectives of these studies were to 1) determine which ratio between light and dark meat is preferred; 2) determine which of milk solids evaluated will permit the highest level of dark meat incorporation into evaluated …

Manufacture Of A Dairy Dessert From Ultra-High Temperature Milk Concentrate, Mark H. Smith

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this project was to initiate development of a nonrefrigerated dairy dessert product. Milk was concentrated by pressure-driven filtration and then sterilized using ultra-high temperature (UHT) processing. Following sterilization, samples were aseptically inoculated with rennet to coagulate the milk, which was then stored at room temperature. These processing steps produced a dairy dessert that did not require refrigeration. I investigated the influence of total solids, milk fat, rennet dosage, storage temperature, and storage time on curd firmness and syneresis. I investigated the effect on curd firmness and syneresis of giving the concentrate a heat treatment prior to UHT …

Nutritional Screening Of Utah Rural And Urban Elderly, Rachel Taylor Rood

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The population of Americans over age 65 is expected to increase from a reported 12 percent in 1988 to 22 percent by the year 2030. Nutrition screening and intervention can help combat the rising need for health care and other services among the elderly by preventing or delaying disability and dependency.

This study was designed to determine the degree of nutritional risk present within the elderly population in rural and urban areas in the state of Utah by conducting an initial nutrition screening using the Determine Your Nutritional Health checklist developed by the Nutrition Screening Initiative. Congregate meal sites were …

The Contribution Of Meats To Energy And Essential Nutrient Intakes Of Women In The United States, C. Dian Martin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study used the 1987-88 USDA Nationwide Food Consumption Survey to investigate the contribution meat products make to intakes of nutrients at risk of inadequate or excessive consumption by women. The study is unique in that meat nutrients were extracted from mixed dishes, providing a more accurate picture of consumption. Cluster analysis was used to classify nonpregnant, nonlactating women 19 years and older based on their consumption patterns of total meat and individual meats (beef, poultry, processed meats, pork and seafoods) as percent of caloric intake.

Total fat and SFA intakes exceeded National Research Council (NRC) goals regardless of meat …

Assessing Mourning Dove Population Declines: Changes In Nesting Dynamics And The Role Of Perch Sites, Paul M. Meyers

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

I replicated a nesting study carried out 40 years ago in southern Utah to assess reasons for long-term population declines of mourning doves (Zenaida macroura) in the western United States. I compared current nesting patterns to similar data collected in 1952. I saw little difference in nest success and nest predation, but reproductive output and nest density decreased dramatically. The number of young fledged per pair of adults was only 64% of that estimated in 1952. A 1-2 week delay in the nesting season contributed to this decrease, but cannot explain it entirely. Nest density was about 20% …

The Response Of Five Tropical Plant Species To Natural Solar Ultraviolet-B Radiation, Peter S. Searles

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Tropical regions currently receive the highest global levels of solar ultraviolet-B radiation (UV-B, 280-320 nm) even without ozone depletion. Thus, the influence of natural, present-day UV-B irradiance in the tropics was examined for five tropical species, including three native rainforest tree species and two economically important species. Solar UV-B radiation conditions were obtained vi using either a UV-B excluding plastic film or a near-ambient UV-B transmitting film in a small clearing on Barro Colorado Island (BCI), Panama (9 ° N). Significant differences were often exhibited as increased foliar UV-B absorbing compounds, increased leaf mass per area, and reduced leaf blade …

Utah Science Vol. 55 No. 1, Spring 1994

Utah Science

No abstract provided.

1st Biennial Ultra-High Temperature (Uht) Symposium, Various Authors

Other Documents

No abstract provided.

Vegetable Canning Methods In The Pressure Cooker, Georgia Lauritzen

All Archived Publications

No abstract provided.

1994 Annual Report, Various Authors

Annual Reports

No abstract provided.

General Catalog 1994-1996, Utah State University

University Catalogs

Contains course descriptions, University college calendar, and college administration.

Home Drying Of Food, Charlotte P. Brennand

All Archived Publications

No abstract provided.

Pine Valley Ridge Source: A Superior Selected Germplsm Of Black Sagebrush, U.S. Forest Service

All U.S. Government Documents (Utah Regional Depository)

This document establishes the basis for the release of Pine Valley Ridge Source, a superior selected germplasm of black sagebrush

Nutritive Quality And Mineral Content Of Potential Desert Tortoise Food Plants, United States Department Of Agriculture, Forest Service

Plants

Minerals and nutrients for desert tortoise food plants from the northeastern Mojave Desert are generally in the normal range for semiarid environments, except that sodium values are low for plants and soil. Annual forbs are often higher in nutritive quality than other plant classes.

Planting Guide For Utah, Howard Horton

All Archived Publications

No abstract provided.

Food Aversion Conditioned In Anesthetized Sheep, Frederick D. Provenza, Justin J. Lynch, John V. Nolan

Green Canyon Environmental Research Area, Logan Utah

We discovered that a food aversion could be conditioned in anesthetized sheep. Sheep were allowed to eat a familiar food (alfalfa-grain pellets) for 30 min, and 90 min later they were given either an intraruminal (IR) injection of water (C), an IR injection of LiCl (L), anesthesia followed by an IR injection of water (A), or anesthesia followed by an IR injection of LiCl (A+L). Induction of anesthesia was by an intraveneous injection of pentobarbitone sodium, and maintenance of deep anesthesia was by halothane. Sheep were maintained in deep anesthesia for 2 h to ensure that the effects of LiCl …