YAY! Sylvie! That's my clever girl!The effect of 'protective ointments' on risk of getting frostbite has been quite extensively studied by the army in Finland. I don't know why I found it funny, but that is why I remember the results.
Putting on 'protective ointments' was a risk factor for developing frostbite (even more so than not wearing a scarf).
There is a lot of literature on this - apparently frostbite is a serious concern in the Finnish army!
https://pubmed.ncbi.nlm.nih.gov/8541749/
https://pubmed.ncbi.nlm.nih.gov/10086864/
Frostbite tax: Sylvie roosting on the underlay-wrapped bracket so I am not worrying about frostbite on her feet.
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& as for frostbite on straight combs ~ we haven't acquired any more straight comb birds since 2013 so no more frost issues. Long wattles (usually on males) can frostbite too but on hens the wattles are usually shorter & tucked into breast feathers during roost. Our Dominique hen has never had frostbite on her rosecomb or short wattles. Dana has the added benefit of having one wattle shorter than the other one so no frost issues w/ her ~ TY, Dana, for being such an easy hen to keep

We don't have snow but a couple winter weeks of temp drops do happen so having no straight comb birds is a boon cuz we don't use heat source panels. Our problem instead, is dealing w/months of heatwaves. Silkies pile up for their heat source or move away slightly for cooling. Smart little buggers!