I had issue last year with lambs not really thriving after a couple months old. Was told was just one of those years. But I already see some this year not motoring on as they have been. Have couple dirty bums started but ones that aren't really thriving are all clean. Just wondering when is best time to get some tested for trace elements and try find out cause of it. Will be given first dose in few weeks as can't do it sooner with other work. Thanks