Abstract
The inheritance of the four most common morph types (smooth, knobbed, linguform A and B) in Haemonchus contortus cayugensis was studied by selection of offspring from females of known morph type and also by mating males from an inbred strain of linguiform A with smooth and linguiform B females. The dominance hierarchy of these characters was found to be linguiform > knobbed > smooth. Linguiform B was recessive to linguiform A but neither character is expressed in the presence of the smooth morph type.
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