Date of Award:

5-1-1963

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Biology

Department name when degree awarded

Zoology

Committee Chair(s)

Datus M. Hammond

Committee

Datus M. Hammond

Committee

Merthyr L. Miner

Committee

Paul R. Fitzgerald

Committee

Thomas L. Bahler

Abstract

Parasitism causes large economic losses to the livestock industry. Included in this economic loss are death to the host animal, but even more important are the losses due to illness, reduced growth rate, decreased meat, milk, egg, and wool production and, in working animals, loss of working energy (Levine, 1961). Even rough estimates of this economic loss are difficult to make. The United States Department of Agriculture (1954) published a 10 year report (1942-1951) on the annual losses due to parasitism in the United States. According to this report parasitism caused an estimated loss to livestock and poultry of $79,532,000 per year. Of this amount the annual loss to parasitism of cattle was $19,026,000, of which $8,989,000 loss was caused by worm parasites. Losses caused by individual parasitic species are difficult to evaluate.

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