The withdrawal period quoted on your link if for a different drug altogether - xylazine - a common sedative used in cattle/horses/dogs/cats. Sedaxylan (a brand of xylazine) only had 24 hour meat withdrawal in this countryAccording to this http://wildpro.twycrosszoo.org/S/00Chem/ChComplex/xylazine.htm it has a withdrawal period of 14 days if used in cattle. Does the withdrawal period relate to the specis rather than the drug?
I have to respectfully disagree with you there! So long as the drug has an established MRL and is licensed in another food producing animal species in the UK or Europe then my reading of the cascade is that the drug can be administered to the animal and the meat be used for consumption after the statutory withdrawal period has been served (minimum of 28 days).If there is no MRL, it can't be used in animals for human consumption. Even if it has a withdrawal in NZ, it doesn’t apply in the UK. Xylazine is licensed in the UK, but only for Zoo deer. As far as I am aware it would not be possible to use any anesthetics or sedative on a deer and it then allow it into the food chain.
I think you would struggle to knock down a deer using just Xylazine and maybe butorphanol. As far as I know no other anaesthetics have MRLs or a licence in food producing animals, ketamine does not.
It is the one good thing (as a vet) that I think has come out of Europe classifying a horse as a food producing animals - many more dugs with withdrawal periods. I quite often use butorphanol in cattle off licence but legally under the cascade.
The issue with lignocaine (if I remember correctly) is one of the bovine metabolites is a known carcinogen that us as simple monogastrics don't produce.You can see the logic, but it is at times potty. The best example is the local anaesthetic, lignocaine. No MRL due to cost, yet used daily by dentists. Potty. Right, off hobby horse