The effects of pre-lambing Anthelmintic drenching on production of ewes and the development of worm parasitism in lambs

K.H.C. Lewis and Victoria V. Stauber

Invermay Agricultural Research Centre, Mosgiel

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Proceedings of the New Zealand Society of Animal Production. 1969, 29: 177-191

No spring rise was observed in either trial and the mean faecal egg counts of ewes remained below 200 eggs per gram until the lambs were weaned. As, a result, attempts to modify the spring rise by anthelmintic drenching prior to lambing were without effect. The patterns of developing parasitism and liveweight gains were similar in lambs from drenched and undrenched ewes.

The effect of drenching prior to lambing was studied in two further trials where ewes were subjected to nutritional stress before and after lambing. Small improvements in liveweight gain and wool quality were recorded but greasy fleece weight was not affected.

Keywords: NZSAPAB;