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I understand you, Fred. You trying to keep a large combed leghorn or delicate silky up there is like trying to grow a citrus tree in the wrong zone. You could probably do it in a pot but you'd have to pamper it, bring it in on cold nights, give it a grow light in the living room for the winter and ultimately it would never really thrive like it does in Mesa, AZ.
Conversely, I don't try to grow rhubarb, blueberries or cranberries here in AZ. I also don't try to raise Buff Orpingtons or other big, cold hardy breeds. Lots of people do but when it gets hot they start dropping like flies. I'll stick with my heat hardy, flighty little Meditterean breeds and am happy to enjoy my fresh lemons and winter garden until I finally get my dream farm in a more temperate climate.
Anyway, I guess that was a long way to answer the poster's question of what to do about frost bite. Ultimately, she needs to consider a rose comb rooster or dub her rooster as frostbite will continue to plague him and Vaseline is only a very poor bandaid for a breed not suited for the climate.
Our temps here in coastal Texas averaged 109 this summer for two to three months. Not a one of my orps died. Granted, there's only 9 of them right now but mixed ages and made it ok. All but one who had a very hard time once it got to around 110. He's now elsewhere. I know what you're saying about climate though and your point is still accurate in that one really should get birds that are best for the climate. It just really made my eyebrows raise that none of mine died yet even some supposedly hardy flocks had many losses in the heat this year. I think husbandry plays a large role when it comes to extremes.
Yes, I understand. But, a lot of chickens did just fine here in AZ too. Until we had two weeks over 115. It was that 122 day that really did a lot of birds in, especially since it came after weeks of terrible heat stress. There is a huge difference between 109 and 115 when it comes to cooling a chicken. It also depends on your setup. I actually had some Cornish X that were shipped from Mcmurray's by accident and they survived the summer but I have a completely shady yard. The Cornish X is terrible in heat and really suffered but they did live.
Folks without trees didn't fare so well.
However, there was a huge difference in comfort level between the Cornish X and my little Meditterean breeds. Even between the EEs,which do pretty well, and the Medittereans. They would start panting at a much lower temperature and were much less active.
Many, many people keep buff orpingtons alive in AZ. Marans as well. They are just not as suitable to our climate as a leghorn or Hamburg. When the furnace is blasting, they suffer and it's more likely that they will die of heat stress.
It's a personal choice. I didn't lose anybody even when it was 122 degrees, even the Cornish X. But, I wouldn't ever choose to raise those types of breeds in this climate at that time of year. Just saying, for my flock, I prefer to choose breeds appropriate for the climate.