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An Experimental Analysis Of Second-Order Conditioned Taste Aversion: Drug Pairing Facilitated Through Excitation Of Geotactic Behavior, John H. Gatling

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In two experiments, second-order conditioned taste aversion techniques were employed to develop aversions in rats, with a geotactic-excitation procedure as the independent variable. Periodic tilting of an experimental apparatus resulted in angular orientation changes of all subjects located within compartments of the chamber. The effect was excitation of geotactic behaviors, expressed as locomotor activity within the confines of these compartments.

In the first experiment, two groups of rats (n = 6) were exposed to experimental protocols which were identical with the exception of the independent variable. Three conditioning trials were presented, separated by five to seven days, within which …

The Effects Of Disease, Prey Fluctuation, And Clear-Cutting On American Marten In Newfoundland, Canada, Richard J. Fredrickson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Individual variation in survival and behavior of American marten (Martes americana) was studied in relation to disease, prey fluctuation, and clear-cutting from 10 January 1986 through 20 August 1987 in Newfoundland, Canada. Thirty-seven of forty marten captured on the study area were telemetered and monitored for part or all of the study.

Marten mortality was concentrated in two intervals, fall 1986 and late winter 1987. Mortality during fall 1986 was attributable to encephalitis, while marten deaths during late winter 1987 resulted from predation and starvation attributable to the prey decline. Nonsuppurative encephalitis was first detected 7 October 1986; …

A Descriptive Study Of Range Livestock Operations In The Somali Central Rangelands, Abdinasir M. Abdulle

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Information on livestock operations, particularly what kind of livestock operations are practiced in the Somali central rangelands, and how these operations differ for different herders in different vegetation types and farming systems, could serve as a major tool in making management decisions. This study provides a detailed description of range livestock operations in the Somali Central Rangelands. It also answers some important management questions.

Range livestock operations were inventoried through personal interviews with the owners and herders. Data are supplemented by previous nation-wide and regional survey statistics. Herd productivity data which include herd structures, age, age-related sales, slaughters, gifts, and …

Interrelationships Among Magnesium Deficiency, Ketogenic Diet, And Fasting On Seizure Susceptibility, Hamdia Mohammed Shahwan Ai-Hamdani

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Fasting and ketogenic diet prevent seizures in epileptic children, magnesium-deficient rats and other animal models of seizure disorders. This effect has been attributed to increased levels of circulating ketone bodies. The purpose of this study was to determine the role of serum ketone bodies, measured as beta-hydroxybutyrate (BHB), in preventing audiogenically-induced seizures in weanling rats fed a magnesium-deficient diet for 17 days.

The effect on seizure susceptibility was investigated by feeding a magnesium-deficient diet to weanling rats for 17 days. Fasting and ketogenic diet (dietary medium chain triglycerides, MCT) markedly decreased seizure incidence that was associated with increased serum BHB …

Seasonal Movement Patterns Of Coyotes In The Bear River Mountains Of Idaho And Utah, Glen F. Gantz

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Coyotes (Canis latrans) prey upon domestic sheep. The Animal Damage Control (ADC) program currently relies heavily on aerial gunning in winter to control coyote depredations on mountain grazing allotments. Some people claim that winter aerial gunning is not effective because coyotes migrate to lower elevations during winter, following herds of big game animals, and may not be on the allotments where summer depredations occur. I studied the seasonal movement patterns of coyotes in the Bear River Range of Utah and Idaho to determine if coyotes in montane habitats move on a seasonal basis. Radio-collared coyotes were located from fixed-wing aircraft …

Burning, Flaming And Herbicides For Control Of Jointed Goatgrass (Aegilops Cylindrica Host.), Blake D. Willis

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Winter wheat stubble and dried plant residue in Conservation Reserve Program (CRP) fields were burned in the fall and spring to evaluate effects on jointed goatgrass (Aegilops cylindrica Host.) seed survival and germination. Laboratory studies were also conducted to determine minimum temperatures and heat duration needed to reduce jointed goatgrass seed viability. Maximum air temperatures attained during various field burns reached from 74 C to over 700 C. Temperatures 2.5 cm above the soil surface remained above 400 C for over 10 seconds and above 600 C for 2 to 8 seconds in burning CRP stubble. Results for the …

Reproductive Ecology Of Wyoming Big Sagebrush (Artemisia Tridentata Ssp. Wyomingensis) : Effects Of Herbivory And Competition, Richard T. Decker

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Herbivory and plant competition affect sexual reproduction of plants in various ways. Exclusion of mule deer (Odocoileus hemionus) and cattle, removal of plant competition (both inter- and intraspecific), and all combinations of the above treatments were used to examine the individual and combined affects on Artemisia tridentata ssp. wyomingensis (Wyoming big sagebrush) reproduction. Reproduction of Artemisia tridentata ssp. wyomingensis was divided into hierarchical levels of the number of: (1) modules per current-year ' s growth (CYG), (2) nodes per module, (3) inflorescence heads per node, (4) achenes per inflorescence head and (5) percent viable achenes. Counts at hierarchical …

Effects Of Cannulation, Bst Administration And Protein Degradability On Rumen And Duodenal Characteristics And Milk Production Response In Holstein Dairy Cows, Margaret D. Winsryg

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Bovine somatotropin (bST) is a protein synthesized at the base of the brain and released by the pituitary gland into the circulatory system. BST is transported by the circulatory system and absorbed only by cells of target organs that possess cell surface receptors for the protein (11, 41). Its effect is initiated via a protein receptor initiation and cyclic AMP cascade. This effect on the cell continues well past the degradation of the bST molecule. BST is likely transported into the cell, where it is degraded. Its constituent blocks, amino acids, are used to synthesize new proteins or converted to …

Yellowstone's Northern Elk Herd: Critical Evaluation Of The "Natural Regulation" Paradigm., Charles Edward Kay

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Prior to 1968, the National Park Service contended that an unnaturally large population of elk had severely damaged Yellowstone Park's northern winter range, including aspen and willow communities. However, under "natural regulation" management adopted in the earl y 1970s the agency now believes that vegetation changes in the park are due to normal plant succession, climatic change, or fire suppression, not ungulates. The agency also believes that large numbers of elk (12, 000 - 15, 000) have wintered on the park's northern range for the last several thousand years. This study tested several of the major assumptions or predictions of …

Recreation Specialization And Preferences Of Utah Anglers, Bruce P. Andersen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purposes of this study were to gain a better understanding of anglers and angler preferences and to examine differences between subgroups of anglers based on level of specialization. Understanding these similarities and differences between user groups will provide valuable input for more effective fisheries management.

A randomized mail survey was sent to resident, adult fishing-license holders in Utah. A 68% response rate yielded 1216 usable returns for data analysis. An analysis of three recreation specialization dimensions (participation, equipment and investment, and lifestyle) and further analysis of participation and investment variables were used to develop a typology of Utah anglers. …

Self-Consciousness And Body Image Issues Among College Females, Mary E. Doty

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study examined some of the procedures used in eating disorder research. Body size estimation procedures, in light of their similarity to procedures in social psychology, were used to create self-focus and self-consciousness conditions. If the procedures in the present study create self-consciousness effects, it is possible that the results of those studies have been affected by a heightened state of self-awareness. The present research also explored the relationships between self-consciousness, self-esteem, body esteem, body perception, and eating disorder proneness.

The research was conducted with a nonclinical sample from a university population, controlling for age and body development factors. Baseline …

Cognitive And Attributional Correlates Of Depression: An Analysis Of The Redundancy Between Beck's Cognitive Triad And Seligman's Attributional Styles, Kent W. Anderson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to examine the degree vi of redundancy between two prominent cognitive theories of depression: Beck's cognitive triad and Seligrnan's attributional triad. Three hundred and eighteen subjects were recruited from nine different psychology courses at Utah State University and affiliated locations across the state. Subjects completed the Cognitive Triad Inventory (CTI), the Attributional Style Questionnaire (ASQ), and the Beck Depression Inventory (BDI).

Results indicate that the three CTI subscales (self, world, and future) and the three ASQ subscales (internal, global, and stable) did not correlate sufficiently to merit integration across measures. However, factor analyses reduced …

The Effects Of Methionyl Bovine Somatotropin Administration On Luteinizing Hormone In Dairy Cattle, Joseph Charles Dalton

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Sixteen lactating regularly cycling dairy cows (14 primiparous, 2 multiparous) were used to determine the effects of somatotropin administration on basal, peak, and pulse luteinizing hormone concentrations during the breeding period. In addition, the effects of somatotropin administration on the pituitary response to a gonadotropinreleasing hormone challenge was studied. The experimental group received daily somatotropin treatments (25mg) for 24 days. The control group received a daily placebo. All animals were treated with three injections of prostaglandin F2-alpha (25 mgjtreatment) for estrus synchronization. Somatotropin and placebo treatments began with the second prostaglandin injection. Sixty hours following the final prostaglandin injection, all …

A National Survey Of Enterprise Budget Development And Use By The Extension Service, Douglas W. Eck

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis investigates the development and use of viii agricultural enterprise budgets. An enterprise is a single crop or livestock commodity, and enterprise budgets are valuable management tools. They serve as the basic building blocks of complete farm planning.

Two separate surveys gathered information from the Extension Service concerning the use and development of enterprise budgets. Analysis of the survey results identified the most common methods used to create enterprise budgets as well as factors that contribute to their use.

A regression analysis was performed to determine the factors influencing the number of times county agents directly refer to published …

Endocrine Interrelationships During Early Postpartum In St. Croix Sheep, Richard Michael Anderson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The relationships of estradiol-17-beta, progesterone, and LH in the early postpartum St. Croix ewe were monitored during the breeding season in 1988. A second group of non-postpartum, ovariectomized St. Croix ewes were used to determine non-ovarian levels of progesterone for comparison. Results of this study indicate that:

1. The short duration rise in progesterone exhibited by some ewes is indicative of an ovulation.
2. Ewes that do exhibit a short luteal phase prior to the first "normal" luteal phase have a longer period from parturition to the first "normal" luteal phase.
3. Serum levels of LH increase beginning 3 days postpartum.
4. There is …

Chromosome Abnormalities As A Possible Cause Of Reduced Fertility In Dairy Heifers, Stanley L. Henderson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Chromosome evaluations were made on leukocyte blood samples from 169 phenotypically normal nulliparous Holstein heifers. These were from three different reproduction groups collected in sets of threes from 10 different herds in the western United States. Group 1, the control group, consisted of heifers diagnosed pregnant after one or two breedings; Group 2 consisted of heifers diagnosed pregnant after three or four breedings; and Group 3 consisted of heifers diagnosed open after four or more breedings. Metaphase chromosome spreads used in these analyses were obtained through 72-hour leukocyte cultures from heparinized whole blood. Processed cells were dropped onto a slide, …

The Effects Of Conditioned Reinforcers On Extinction When Delivered On Schedules Of Extinction, Linda L. Barnard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of the present research was to examine extinction of responding with regard to the rapidity and thoroughness of the process when conditioned reinforcement was available on one of five schedules during extinction. Forty-five mixed-breed pigeons served as subjects with 15 in each of three experiments. Reinforcement training schedules were as follows: Experiment 1, continuous; Experiment 2, fixed ratio 15; Experiment 3, variable-interval one-minute. After training, subjects experienced one of five extinction procedures (here called schedules of extinction) which were as follows: traditional schedule without keylight did not provide conditioned reinforcement; traditional with keylight had the keylight on continuously …

The Importance Of Cover For Juvenile Rainbow Trout In Lentic Systems: Field Observations And An Experimental Study On Predation, Roger Allen Tabor

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Juvenile rainbow trout Oncorhynchus mykiss stocked into mid-elevation reservoirs in Utah are vulnerable to predation from piscivorous fish and birds. I determined how effectively juvenile trout used cover to avoid these predators by (1) direct observations (snorkel transects) of habitat selection in two reservoirs and (2) measurements of survival and growth rates in a pond experiment where adult brown trout Salmo trutta were predators. Observations of juvenile trout were conducted within five weeks of stocking in 1988 and 1989. During the day, juvenile trout were abundant in complex inshore habitats and avoided simple habitats such as sand and gravel. Measurements …

Immunological Effects Of Ketoconazole, Itraconazole And Fluconazole On Lymphocyte Cell Proliferation And Natural Killer Cell Activity In Immune-Normal, Cyclosporine-Compromised And Cyclophosphamide-Compromised Mouse Models, Jeffrey Tullis Mitchell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Over the past several years there has been a steady increase in the incidence of immunologically compromised patients. This has been the result of both chemical agents, such as those used in cancer chemotherapy, and biological agents such as HIV, the cause of Acquired lmmunodefeciency Syndrome (AIDS). The increase in immune-suppressed patients has lead to an increase in life-threatening mycoses requiring treatment with antifungal agents. Pharmaceutical companies have increased research for the development of new antifungal agents which are more effective and less toxic than those that are currently used. Several researchers have reported on antifungal agents that demonstrate both …

Comparative Foraging Ecology Of Sheep And Goats In Caatinga Woodland In Northeastern Brazil, Scott L. Kronberg

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Small-ruminant production is an important part of the agricultural economy of northeastern Brazil. However, mild-to-severe undernutrition of livestock is an annual occurrence. Goats can tolerate the marginal forage conditions better than sheep, but the mechanisms underlying their superior tolerance are not understood.

An analysis of animal liveweights at the end of the year-long study indicated that reproducing mixed-race goats gained nearly twice (P<.05) the weight of reproducing hair-sheep of the Santa Ynez breed, and non-reproducing goats gained about 1.2 times more (P<.05) weight than non-reproducing sheep. Daily weight gains of lambs were less (P<.10) than those of kids for their first 80 days of life.

In the wet season, reproducing sheep and goats gained similar (P>.05) weight, while non-reproducing sheep gained more (P≤.05) than non-reproducing goats. Non-reproducing goats had greater (P<.05) forage organic matter intake (OMI) than the corresponding sheep in the two wet periods. In the late-wet period, non-reproducing goats had greater (P<.05) digestible energy intake (DEI) than corresponding sheep did but had similar (P>.05) digestible protein intake (DPI) as sheep.

In the dry …

Effects Of Ketoconazole On Uterine Weight And On Unbound Serum Estradiol Relative To Vaginal Cornification In Rats, Leonard L. Hall

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Ketoconazole is a broad-spectrum antifungal with oral activity and is documented to block steroid biosynthesis in fungi and mammals.

Estradiol-primed ovariectomized rats lose the estradiol-induced, cornified layer of the vaginal epithelium as a result of ketoconazole treatment. This effect is not explained by current knowledge of ketoconazole's mechanism of action.

Ketoconazole's effect on estradiol's binding to either receptors in target tissues (target-cell receptors) or serum-estradiol-carrying proteins in the aforementioned rats was investigated.

The uterus is responsive to estradiol treatment, which causes an increase in uterine size and weight. This tissue is a sensitive means of studying the effects of ketoconazole …

An Experimental Analysis Of Higher-Order Stimulus Control In Humans, Michael B. Gatch

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This dissertation explored sane effects of context on the development of stimulus classes and the transfer of stimulus functions to novel stimuli. The research was also intended to demonstrate the utility of current behavioral theories for prediction and control of contextual effects on class formation. In Experiment lA, contextual control of stimulus classes was established successfully in all six college-student subjects. Matching-to-sample training successfully transferred the function of the contextual stimuli to four novel stimuli, whim resulted in the formation of two three-member classes of contextual stimuli. The first portion of Experiment 1B replicated Experiment 1A with three additional subjects. …

The Response Of Coyotes To Novel And Familiar Visual And Olfactory Stimuli, Yiting Zhang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to explore the response v of coyotes (Canis latrans) to certain olfactory and visual stimuli. It was assumed that the findings would be of value in refining techniques used in sampling and controlling coyotes. The specific objectives were to determine (1) if coyotes were more likely to approach and remain in the vicinity of a familiar than unfamiliar scent, (2) if the response to olfactory and visual stimuli differed, (3) if positively reinforcing an approach to the stimuli differentially altered the response to visual and olfactory stimuli, and (4) if the response …

The Effect Of Seasonal Cattle Grazing On California Bighorn Sheep Habitat Use, Melanie J. Steinkamp

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The effect of seasonal cattle grazing on a newly reintroduced population of California bighorn sheep (Ovis canadensis californiana) in Big Cottonwood Canyon, Idaho, was studied. The hypothesis that bighorn sheep avoid cattle was tested. The issue of avoidance between bighorn sheep and livestock is arguable. Some studies have found that bighorn sheep avoid cattle while others have found no response of bighorn sheep to cattle.

Evidence was found to document the avoidance of cattle by bighorn sheep. The size of the bighorn's home range and core area decreased with the movement of cattle into areas of high bighorn …

Purification And Immunological Reactivity Of Commercial Microbial Milk Clotting Enzyme Preparations, Chima I. Osuala

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Commercial microbial milk clotting enzyme preparations were purified by immunoaffinity chromatography using purified antibody covalently coupled to porous glass beads as the column matrix. Commercial enzyme preparation diluted in 1 mM sodium acetate buffer at pH 5.0 was then biospecifically adsorbed to the column matrix by end-over-end mixing of the glass-antibody complex in the enzyme solution for 12 h at 5°C. The antibody bound enzyme adsorbed glass beads were soaked in .2 M glycine or ethanolarnine at pH 7.0 to block uncoupled reactive sites on the matrix. Following this, the column was washed with 1 mM sodium acetate …

Pesticide And Water Management Alternatives To Mitigate Potential Ground-Water Contamination For Selected Counties In Utah, Majid Ehteshami, Antonio M. Requena, Richard C. Peralta, Howard M. Deer, Robert W. Hill, Ahmad Yar Ranjha

Civil and Environmental Engineering Faculty Publications

Production of adequate supplies of food and fiber currently requires that pesticides be used to limit crop losses from insects, pathogens, weeds and other pests. Although pesticides are necessary in today's agriculture, they can be a serious problem if they reach and contaminate ground water, especially in places where drinking water needs are supplied from ground water. The relative reduction of potential ground-water contamination due to agricultural use of pesticides was analyzed for particular sites in Utah. The potential reduction of pesticides in ground water was considered by utilizing alternative irrigation systems, water management practices and pesticides. A one-dimensional simulation …

Immunosuppression By Aflatoxin B1 In C57bl/6 Mice And Its Relationship With Neuroendocrine Mechanisms, Yasuhiko Hatori

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Aflatoxin B₁ (AFB₁), a secondary metabolite of Aspergillus flavus and Aspergillus parasiticus, is known for its potent carcinogenicity and immunosuppressive effects. It is also known that AFB₁ toxicity appears in different degrees in different animal species and strains.

The present study was performed to reveal the involvement of the hypothalamus-pituitary-adrenal gland (HPA) axis in the immunosuppressive effects of AFB₁ on C57BL/6 mice. Splenic lymphocytes were assayed to investigate their phenotyping using flow cytometry, proliferative response against mitogen and allogenic lymphocytes, cytolytic cell activity, and IL-2 production. In addition, antibody-mediated immunocompetence was checked using sheep …

A Comparison Of Three Estrous Detection Management Schemes For Dairy Heifers, Ann Lagerstedt

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Heifers should represent the greatest genetic potential within a dairy herd. To maximize this potential, heifers must be inseminated to proven sires, a practice requiring management changes on many dairies. Holstein heifers (n=115) were allotted to one of three groups to compare alternatives to daily estrous detection that may facilitate the management of a program of artificial insemination for heifers. Group 1 heifers (Controls) received no treatment but were observed twice daily for signs of estrus. Group 2 heifers (2X-PGF) were synchronized with two injections of prostaglandin F2 alpha given 11 days apart and observed for estrus. Group 3 heifers …

Morphology Of Polyanhydride Microsphere Delivery Systems, E. Mathiowitz, D. Kline, R. Langer

Scanning Microscopy

Scanning electron microscopy (SEM) was used to elucidate the mechanism of polymer degradation and drug release in polyanhydride microspheres. Three different fabrication methods — solvent removal, solvent evaporation, and hot melt microencapsulation — were used to prepare polyanhydride microspheres containing a variety of drugs. The morphology of these microspheres releasing drug in vitro and in vivo was studied by SEM and compared with degradation and release data measured by conventional methods. Microspheres prepared by the three techniques were shown to have distinctive morphological characteristics induced by the nature of the fabrication method. In addition, SEM analysis could be used to …

Osteoclast Cytomorphometry And Scanning Electron Microscopy Of Bone Eroded Surfaces During Leukemic Disorders, Daniel Chappard, Jean François Rossi, Régis Bataillle, Christian Alexandre

Scanning Microscopy

Tartrate resistant acid phosphatase (TRAP) is a reliable histochemical marker of osteoclasts when used on tissue sections of undecalcified bone. This paper presents an original morphometric analysis which can be done after histochemical identification of osteoclasts. These bone resorbing cells were demonstrated on undecalcified bone biopsies from control subjects and patients presenting a malignant disease of the lymphocyte B lineage. Computerized analysis of the osteoclastic population revealed that: (1) all TRAP positive cells along bone trabeculae belong to a osteoclastic population; (2) that B cell malignancies had an increased bone resorption. At the scanning electron microscopic level small resorption bays …