Nematode parasite populations in sheep on lowland farms II. worm egg counts in lambs

Abstract

This work started in May 1950 and is part of a wider study of parasite populations on lowland pastures. An account of observations made on ewes has already been given (Crofton, 1954), and the present paper deals with observations made on lambs from the same flocks. It is realized that a proper approach to parasite problems in sheep entails consideration of the flock as a whole, but for convenience, the observations made on different age groups have been described separately. It is for convenience, also, that pasture contamination is only considered briefly here. Later an attempt will be made to consider parasite populations on a lowland farm as a dynamic system of interacting factors.