Thank you Sally, that makes sense.
At what age should I start to worm lambs?
It does of course depend on where you are, when you lamb, the year, the weather, all kinds of things.
And keep an eye on the NADIS forecasts, too.
We try to get most of our 'earlies' (born February / early March) away with no treatments at all. The rest of the flock lamb later in March and through April, and if we haven't needed to worm lambs before, we will worm them when we shear their mums, which for us is end June/early July.
We also get indication as batches go away through our slaughterhouse reports if there is anything amiss - fluke, lungworm, tapeworm, etc. But if you're not selling batches deadweight, or slaughtering for yourself, you don't get that info.