Okay, thanks, that helps a lot actually with planning the outfits for one of my families.It's both but I don't know what percentages to attribute to either.
Pretty much. The closer the ambient temperature is to their core body temperature the harder it is for them to transfer heat away from their bodies. Heat transfer rate is dependant on the temperature difference between hot source and cold sink; mostly. If the ambient temperature is say 10C the chicken will lose heat faster than if the temperature is 20C


