If I'm honest, I don't always work out the cost of things. Today I asked Dan to order some VermX for the sheep - he doesn't mind looking for the cheapest prices, whereas I get fed up. He just came in and asked me how much did I think it cost per sheep - 10g / day / sheep for 7 days each month? Worked out at about £15 per sheep.
Now, I also worm test - each one costs about £8. I do composites ie one per group of sheep not one per sheep and do it twice a year - so about 4 a year, £32.
I'm wondering if I would be cheaper using the worm tests plus a chemical wormer if I need to. I have give them a flukicide anyway twice a year. The vet will give me small doses at a reasonable cost.
What does everyone else do?