Importance of the ewe as a source of trichostrongyle infection for lambs: Control of the spring-rise phenomenon by a single postlambing anthelmintic treatment

Abstract

Extract

There are two principal sources of initial infection for the young lamb, the ewe grazing with it and the residual pasture infection resulting from any previous grazing. Several workers (Hawkins et al., 1944; Leiper, 1951; Spedding and Brown, 1956; Spedding, 1962; Crofton, 1958; Soulsby, 1962) believe that the former is generally the more important.