Influence of crude fiber from two different sources and two levels of cobalt on the biotic potential of Haemonchus contortus in sheep : a thesis /
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| Format: | Thesis Book |
| Language: | English |
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[College Station, Tex.] :
[Texas A&M University],
[1976]
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| Subjects: |
| Abstract: | ABSTRACT: Ten treatments were used to evaluate the influence of two types of crude fiber (alfalfa versus cotton seed hulls) and two levels of cobalt on experimental haemonchosis in 5 groups of 4 sheep each. The rations used were designated A₁, A₂, A₃, A₄ and A₅ with the crude fiber contents of approximately 3, 5, 15, 27, and 5 percent, respectively. Rations A₁₋₄ utilized crude fiber of cotton seed origin and A₅ crude fiber of alfalfa pellet origin. Each ration was fed to 4 lambs, two of which also received 7 mg of cobalt sulfate supplement weekly as a drench and two which served as controls. Each lamb received 10,000 L₃ H. contortus in a single dose orally. Each of the experimentally infected lambs developed mild signs of parasitism. Lambs fed rations A₃ and A₅ developed haemoglobin values as low as 8 gm/dl. Crude fiber had a significant influence (P<0.005) on the percent of eggs hatching with each ration, but there was no significant variation in weight and total number of H. contortus recovered at necropsy examination. Rations containing alfalfa pellets did not differ significantly from those rations with cotton seed hulls in effecting fertile egg production by H. contortus (P>0.1). A 5% crude fiber ration (alfalfa) was associated with higher (P<0.001) eggs per gram counts in the lambs than a corresponding ration with 5% crude fiber (cotton seed hulls). Cobalt supplementation had a significant influence (P<0.005) on the number of L₄ arrested in development by the lambs. For all parameters examined there was no evidence of crude fiber X cobalt interaction noted. |
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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 1976". |
| Physical Description: | x, 52 leaves : illustrations ; 28 cm |
| Bibliography: | Includes bibliographical references (leaves 47-51). |