Frontline spray works differently to the spot-ons Chris, it works as a contact killer, the spot-ons go into the bloodstream, they don't tend to work as well because they act when the parasite sucks blood, not all things that live on birds do that, alot will live on skin and feather debry, so spot-ons don't work as effectively as the spray. I have heard of a few dogs and cats who have had a reaction to both, the carrier for the fipronil in the spray is alcohol, and that is the main cause of a reaction, not actually to the drug fipronil. I suppose with any drug any animal could have a reaction to it, but alcohol is more widly the cause. Our vet asks that we withdraw eggs for 7 days as a precaution, but we carry on eating them, have done for years, with no ill effects, but it's up to the user if they want to withdraw or still eat. It says on the bottle that once dry, people can pet their animals again with no risk. If i used spot-ons, i would withdraw because the drug goes into the blood. The Ivermectin group of drugs, licensed for cattle also works through the bloodstream. Although Harkermectin is licensed for pigeons.
On a personal grumble, i don't know if anyone else feels the same, but don't you think it's about time someone came up with a product designed especially for poultry that actually works!? Then we wouldn't have to resort to using things which aren't licensed for them. It makes me so cross, when we first had an outbreak of NFM four years ago, we spent a fortune trying to find something for chickens, which would rid us of them, nothing worked, I tried, Harkermectin, johnsons mite killer spray,total poultry solutions, Noromectin, and the Barrier range,over the course of about three weeks! Then my horse vet told me she used frontline spray on her silkies and it was great, so she perscribed me some for my birds, i have never used anything else since, the occational young bird with feather mites, (we have thousands of wild birds round here that bring them.) i use Doff on, and in the houses because frontline is too expensive to spray in those! I re-dose every 2 months because we bath our birds for showing, and there's never anything on them. But i do feel that if they bought out a product similar to frontline spray, licensed for poultry which we can get over the counter in the same way we buy our wormers, from chemical licensed suppliers, we'd all be much happier! There's loads more folks keeping poultry in back gardens now as pets or for eggs, to warrant the cost of production and licensing for heavens sake!
End of rant, sorry. :roll:
JubesXX