Abstract
Ectoparasites considered in this review are the parasitic insects as well as mites and ticks. The role of host nutrition in host defense, the role of protein and vitamin A, the need for vitamins of the B-complex, and the role of lipids and minerals are discussed. Wherever necessary the author is critical of inadequate methods or interpretations that may not be justified. Research has shown that subtle changes occur in the malnourished animal that may not become apparent until it is infested with a parasite. Moreover, it now seems clear that the standard recommendations for vitamin intake may in some cases not be adequate to aid the host in defense against parasitism.

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