Hi,
Sorry for the delay in responding, we have been closed for a few days to do a stock take..
On the subject of Liver Fluke - The test looks for worm eggs in the sample, so the worms would need to be at a mature egg laying stage of their life cycle for the test to actually see any eggs (this is the same for any worm type in an egg count test) - a good source of info on Fluke is here :
http://www.sac.ac.uk/mainrep/pdfs/tn557liverfluke.pdfFor checking for liver fluke in pigs - please make a note on the form that you would like this to be done, as the fluke eggs are slightly heavier and a different solution is used in the lab when mixing the sample prior to examining.
For Leghorn: That is a hard question to answer, as I don't know what was used to worm the weaners or if the correct dose was given to each one, or if you have worms already on the land. Personally I would say carry out a worm count or re-worm them if you prefer just to worm for the sake of it at around 4 - 5 months of age. But obviously any worming programme should be discussed with your vet.
Thanks