Inhibited development ofOstertagiaspp. andCooperiaspp. in naturally acquired infections in calves

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Abstract
Extract Inhibition of the development of the larval stages of parasitic nematodes in their final host is a common phenomenon in many host/parasite systems and the fact that the inhibited forms are capable, at a later stage, of resuming their development has been recognized for some time (for reviews see Armour et al., 1969a Armour, J. , Jennings, F. W. and Urquhart, G. M. 1969a. Inhibition of Ostertagia ostertagi at the early fourth larval stage — I. The seasonal incidence. Res. vet. Sci., 10: 232–237. [Google Scholar] ; Michel, 1971 Michel, J. F. 1971. Adult worms as a factor in the inhibition of development of Ostertagia ostertagi in the host. Int. J. Parasit., 1: 31–36. [Google Scholar] ).