Hi
One of our 5M old Ryeland lambs has a really dirty bum (green/brown). We cut away affected fleece during the week but are now off out to clean him up at he is still affected. He is the only one of the 5 lambs we have with an issue but seems absolutely fine otherwise. Up and about, grazing with the others. They are completely grass fed apart from occasional (once a week) small amounts of grass nuts/pencils used for bucket training (2 handfuls of each shared between the 5 animals so not much). They were the first grazers on our land and it had been unused for 5M. The 5 sheep on there before were 'renting' to get away from flooded land but were not affected by worms. The paddock is grass and buttercup with occasional thistles and a small amount of clover. Nothing else we know of.
Is this likely to be a result of the grass being wet with dew most days now or something else? They have not been wormed as we thought (foolishly?) it was a 'clean' field.
Thanks for any guidance!