Take 10 separate fresh dung samples from each mob to a private veterinary practitioner for a count. If a drench is required use one with at least 95 per cent efficiency. Sheep bought in with an unknown drench resistance history should be drenched with a macrocyclic lactone drench. Sheep with worms will have a reduced feed intake and reduced production. They are also more likely to scour which can lead to problems with breech strike.
Urea poisoning occurs when lambs have access to too much urea too suddenly.
This can occur if urea is not mixed uniformly into the ration, or if a ration or a salt lick containing urea is allowed to get wet. Water pooling in feed troughs or lick containers will contain high levels of dissolved urea. Providing shelter over feed and lick troughs and putting drainage holes in them will reduce the problem. Affected sheep bloat, have elevated respiratory rates and appear uncomfortable. They may have a grey scour.