Studies on transmission and incidence of Trypanosoma theileri, Laveran 1902 : a thesis /
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| Format: | Thesis Book |
| Language: | English |
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[College Station, Tex.] :
[Texas A&M University],
1972.
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| Subjects: |
| Abstract: | ABSTRACT: A total of 129 Tabanus nigrovittatis Macquart were collected and dissected 5 days after having fed on a cow infected with Trypanosoma theileri; flagellates resembling the genus Blastocrithidia were found in the hind gut of 8 of the Tabanidae. The possibility of these flagellates being the insect stage of T. theileri was suggested, but definite proof of this fact could not be obtained since inoculations into calves raised free from Trypanosomes failed to produce any infection. The need for further research on this area was stressed. Studies on the incidence of infection with T. theileri in 235 cattle of different age, breed and sex, in 6 vegetational areas of Texas, were carried out. T. theileri was found in 149 (63.4%) of the 235 blood samples examined by culture in blood agar. The highest rates of infection were found in two localities (Angleton and Sugarland) close to West Galveston Bay within the Gulf Prairies and Marshes; a high incidence was also recorded at Sonora located on the Edwards Plateau. The percentage of infection among calves less than 1 year old was much lower (18.4% than that of the adults (80.5%). No significant difference was found between percentages of infection in adult males and females, not between cattle of 3 different breed-groups (Holstein, Hereford and Hereford X Brahman). |
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| Item Description: | Vita. "Major Subject: Veterinary Parasitology". "Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of Master of Science May 1972". |
| Physical Description: | x, 34 leaves : illustrations ; 28 cm |
| Bibliography: | Includes bibliographical references. |