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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Scent-matching of olfactory samples via proxy by domestic dogs Canis lupus familiaris

McKay, Shannon 21 July 2014 (has links)
The well known scenting ability of domestic dogs has been frequently harnessed by using olfactory sampling of items imperceptible to a human sense of smell. Two main applications exist, which are a) detection of a particular scent, and b) scent-matching of a reference scent to a target scent in the presence of scented decoys. Studies on scent-matching have been limited to humans, where the scent vector is a proxy onto which the scent donor has transferred scent, and two non-human studies, in which the scat of the target species was used as the scent vector. All of these studies of scent-matching have been limited to individual scent donors of the same species. The aim of my study was to explore whether dogs can be trained to match a scent-sample via proxy in the presence of scented decoy proxies from other species, i.e. whether dogs are capable of scent-matching via proxy among several scent donor species. The experimental apparatus was a unique circular device with modifications based on previous research and my personal experience. Proxies were scented by a total of 15 species, by transferring scent onto the proxy either via scent donor body contact or scent donor by-product contact (i.e. scat, dung or shed skin of the scent donor). Training progressed in nine stages over a period of 13 months with three training groups. Fifteen subjects were recruited, with 12 completing the training process. All subjects which completed training underwent 80 runs (i.e. attempts to match a reference proxy to a target proxy). All subjects were able to correctly match a scented target proxy in the presence of five scented decoy proxies from other species at levels significantly greater than chance with an overall success rate of 66%. No early training predictors of eventual success were observed. Sex, breed and training venue did not influence success rates. Age of the subject did influence success rates, with the older and younger subjects having a significantly greater match success rate than subjects in the middle-age range. Proxy scenting method (skin contact or by-product contact) did not influence success rates and species of scent donor was also not found to be associated with success rates. My study demonstrated the use of an inexpensive and simple tool which could provide researchers with the means to explore general olfaction theories as well as more specific questions relating to the scenting ability of dogs for academic, commercial or civil purposes.
22

Quantitative investigation of healthy conformational limits in domestic dog breeds

Packer, Rowena M. A. January 2013 (has links)
There are increasing concerns that some pedigree breeding practices compromise canine welfare; with many breeds affected by inherited disorders likely due to adherence to breed standards that encourage exaggerated conformations. Consequently, calls for quantitative limits to be included in breed standards have been advocated to safeguard against conformations that are detrimental to canine welfare. This thesis explores the relationships between extreme conformation and disease-risk, to identify the most at-risk conformations currently being selected for, and recommend healthy 'limits'. Three conformation-related disorders of high welfare importance were investigated; brachycephalic obstructive airway syndrome (BOAS), intervertebral disc extrusion (IVDE) and corneal ulceration. Seven hundred dogs entering the RVe's small animal referral hospital were recruited over 14-months; their conformations quantified using established protocols and disease-status assessed. Generalised linear mixed-model analyses demonstrated for the first time that: (1) relatively shorter muzzles and relatively thicker necks increased the risk of BOAS; (2) relatively longer backs, miniaturisation and being overweight increased the risk of IVDE; and (3) the presence of nasal folds, relatively short muzzles, relatively larger eyelid openings and the presence of exposed sclera increased the risk of corneal ulcers. To test the risk estimates generated from this population, a second study of BOAS was carried out in a non-referral population. Short muzzles and thick necks were confirmed to be risk factors for BOAS, with two further lifestyle risk factors identified: obesity and neutering. A questionnaire-based study discovered an owner-perception of BOAS being 'normal for the breed' that may hamper efforts to reduce its prevalence in the future. As such, educational interventions to change attitudes may be required. The results of these studies are hoped to instigate and inform future breed standard revisions, and influence those within the breeding community to change current breeding practices to improve canine welfare by selecting for more moderate, lower-risk morphologies.
23

Behavioural and physiological characterisation of responses to learning and training in dogs

Torres-Pereira, Carla Maria Calçada January 2015 (has links)
No description available.
24

Motivation and the dogs who influenced me

Smith-Bickel, Janas R. January 1993 (has links)
The desire I have to make visual images has been fueled by my interest in the parley between man and animal. Throughout history, artists have been intrigued by the relationship between man and animal, an intrigue which has evolved into sane contemporary work.Through this series of nine paintings, the message I impart is the importance of mankind's consideration of animal welfare and that animals are dignified, capable of selfhood and deserving of respect.Through the use of them as my subjects, my dogs, Zeek and Hogan, become the domesticated messengers. I use vivid color, odd perspectives, natural poses and environments, the incorporation of pattern and thick application of the paint to convey my opinions.I learned more about myself and my relationship to the dogs who share my life. It is important to me to make images of my feelings about animals and to educate others about the importance of their well-being. / Department of Art
25

none

Hsu, Tan-Hsun 08 August 2006 (has links)
none
26

Hypoglycaemia in virulent canine babesiosis prevalence and risk factors /

Keller, Ninette. January 2004 (has links)
Thesis (MMedVet. (Comp. Animal Medicine))--University of Pretoria, 2004. / Includes bibliographical references.
27

Advancing canine genomics : from map building to population studies /

Parker, Heidi Gayle. January 2004 (has links)
Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (leaves 117-137).
28

Canines helping people how dogs have been useful in a variety of settings /

Salzmann, Krystal L. January 2009 (has links) (PDF)
Thesis PlanB (M.S.)--University of Wisconsin--Stout, 2009. / Includes bibliographical references.
29

Studies on the pathobiology and management of canine osteosarcoma /

Loukopoulos, Panayiotis. January 2002 (has links) (PDF)
Thesis (Ph. D.)--University of Queensland, 2002. / Includes bibliographical references.
30

The use of dogs in California public schools current use, support for potential concerns and educator familiarity with potential benefits /

Ryan, Holly McLean. January 2002 (has links) (PDF)
Thesis--PlanA (M.S.)--University of Wisconsin--Stout, 2002. / Includes bibliographical references.

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