![Sample our Bioscience journals, sign in here to start your access, Latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5925/TOC-Subject-Sample-2021-Bioscience.jpg"})
Abstract
Extract
The high efficiency of some of the newer anthelmintic drugs has shown them to be extremely useful as research tools in field studies of the pathogenicity of naturally-acquired mixed trichostrongyle infestations. With the advent of these drugs, which are highly effective against both the adult and the larval forms of all the common trichostrongyle species occurring in sheep, it has now become feasible to attempt to suppress almost completely worm infestation in sheep on pasture. Previous papers (CitationBrunsdon, 1963, Citation1964) reported the results of two trials undertaken during 1961–2 and 1962–3 to ascertain the effect of trichostrongyle infestation in young sheep. In these trials, half of the flock was subjected to a programme of fortnightly drenching with thiabendazole. The response obtained in these animals was measured in terms of liveweight gain and wool production, by comparison with that of untreated control animals grazing the same pasture. In this way, a base line of comparison was obtained which makes possible an evaluation of the effects of infestation during the first year of life.