My rooster gets the black spots on the comb when it turns cold. I have been keeping their food wet in the house, it is the fermenting the food overnight. Nutrition is more available to them when it is fermented. His black spot has gone. I thing it is a nutrition issue.
I realize in the cold the roosters crown could turn black in cold/freezing weather. However sometimes it happens in the summer. Could anyone shed some light on the cause and remedy?