1/ How long for Panacur to take effect? I was thinking on the lines of a couple of weeks, am I way off.
Odd thing is the day after i administered it two of them started to curl their tails Cant believe it would be that quick Just made me curious.
2/ If you had a persistant worm issue and it remained after a single dose, can you re-administer and if so how long between doses?
1. Usually start to see worms after 24 hours, but if they don't have visible ones, or don't have them at all, you will see nothing.
Curly tail - coincidence, but funny
2.
All wormers only kill the worms inside the pig at the time (they are not a preventative). If they are on wormy ground, pigs will start to get them again immediately. You aim is to keep the worm burden under control, not to eliminate worms altogether.
Why control worms? - because if it gets out of control then a really heavy burden of intestinal worms can suck more goodness out of the pig than you are putting in, it will get thin and ultimately (if you do nothing about it) kill the pig. This would not happen without you knowing that something serious was wrong. Lung worms can create breathing problems – again you should be able to spot this in most cases.
At a lesser infestation level, the pig will be slower to grow, and of course you are feeding not only the pigs but the worms, so more money and longer to get to weight.
You can re-treat the pigs, but as you are not trying to eliminate, this not really required and not recomended! If you treat too often, then the worms that do survive will be those that have some resistance, so in the end you will be doing you pig no good.
In the sheep world the consensus used to be to worm often. However there are worms that are now resistant to several types of wormers, and the view has changed dramatically to only treat based wherever possible on worm burden counts, or only occasionally.
General view for pigs is to worm every 6 months– but with those that are just for meat, make sure that the breeder worms, and you will not need to as they will be at slaughter weight when they would be next due.