Distribution of Some Parasitic Nematodes in the Alimentary Tract of Sheep, Cattle, and Rabbits

The linear distribution of nematodes along the small intestine of sheep, cattle, and rabbits has been examined. In all three hosts the order of succession of species along the intestine appears to be the same. The shape of the distribution usually approximates a normal frequency curve even when the parasite is in an unusual host. In the ovine abomasum, third- and early fourth-stage larvae of Haemonchus contortus tend to aggregate in the fundus, but larvae of Trichostrongylus axei occur in aggregations which appear to be scattered at random over the mucosa.