It seems to be available in France, thanks a lot. You may be right about the alcohol, because today his legs looked a bit less rough.It is possible that the alcohol is acting as an irritant depending on which alcohol has been used. You can buy this in Spain so one can probably get it in France.
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My experience is limited so I don't know if what I've seen is a coincidence : I've noticed my ex-batts now dislike the cold much more than when they were younger (they are three now). The first two winters it didn't seem to bother them at all. This is true for the rain also, so I wonder if age plays some sort of role. Maybe the quality of their feathers is not what it was ?Well this is it. The study I linked to points out that there hasn't been much in the way of studies on cold hardiness for want of a better description. But, type cold hardy breeds into a search engine and one gets a plethora of sites identifying cold hardy breeds. Something is badly wrong here.
My Finnish friend who works with Finnish land race breeds tells me that the Finnish land race breeds have adapted over hundreds of years, but he is not aware of any physiological changes.
In order to be a truely cold hardy breed I would argue that there must be physiological changes otherwise it's an environmental adaptation that in theory any breed of chicken could manage overtime.
Also, I've noticed just like with other species that there are individual differences in regard to cold weather within the flock, even if they are all the same breed.
When I first started looking for information on french sites I found the same things copied and pasted over and over. At least on BYC there are a number of different opinions expressed and one can get the sense that things assessed as evidence, may not be.All of those and then some.
Here are a few that I have attempted to tackle. Imagine the outcry if one could prove that keeping chickens out of their comfort range amounts to animal cruelty.
1) chickens are not flock creatures.
2) the egg song nonsense
3) why chickens dust bathe
4) the levels of calcium found in layers feed is fine for roosters
5) moulting prevents chickens from laying eggs
6) It's fine to cut a chickens beak
plus a few more I've got on the back burner.
Of the things you mention, I'm happy to say I didn't come often upon 1,4 and 6 which could be really harmful.