Evaluation of methods of premunition to Anaplasma marginale : a thesis /
| Main Author: | |
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[College Station, Tex.] :
[Texas A&M University],
[1975]
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| Subjects: |
| Abstract: | ABSTRACT: A frozen stabilate prepared from a pooled sample of blood containing red blood cells highly parasitized with A marginale was used as the infective organism in this trial. Twenty-five yearling crossbred heifers were divided into 4 experimental groups. Group I consisted of 7 animals which were vaccinated with 2 injections of Analpaz vaccine at 4-week intervals prior to the first infection with live organisms. Group II, consisting of 9 animals, was designated as the untreated group. The 5 animals in group III received oxytetracycline 11 mg/kg when their parasitemias reached 4.6%. Group IV, consisting of 4 animals, was designated as the control group. Clinical manifestations of the infection were mild. During the infection the animals had a rough hair coat and poor body condition. There was some decrease in weight gains but nothing remarkable clinically. A complement fixation titer preceded the appearance of a parasitemia by up to a week. Associated with the appearance of a parasitemia were decreases in PCV, RBC, and HB and a rise in MCV. The recovery rates for the animals in each of group, I, II, and III showed no significant differences. The animals in group II (untreated) displayed a faster rate of recovery than either group I or group III for PCV, RBC, and Hb, but had a slower rate of weight gain. |
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| Item Description: | Vita. "Major Subject: Veterinary Microbiology". "Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of Master of Science May 1975". |
| Physical Description: | ix, 72 leaves : illustrations ; 28 cm |
| Bibliography: | Includes bibliographical references. |