Frizzles

Frizzles are a genetic mutation found in certain breeds of chickens that causes their feathers to curl outwards instead of lying flat. This unique appearance is due to a modification in the feather follicle's structure, preventing the barbules from interlocking properly. The gene responsible for the frizzle trait is called the F gene. When a chicken inherits one copy of the F gene (F/f), it is considered heterozygous and will have frizzle feathers. If it inherits two copies (F/F), it is homozygous for the trait. Homozygous frizzles often have more extreme feather curling and can sometimes experience health issues related to their feathers, such as overheating or difficulty with insulation. Heterozygous frizzles typically have a less severe but still noticeable curl and are generally healthier. The frizzle gene is autosomal, meaning it is not linked to sex chromosomes. Different breeds can carry the frizzle mutation, including Silkies, Polish, and some varieties of Leghorns, among others. While the frizzle trait is primarily an aesthetic characteristic, it has made these chickens popular in exhibitions and as novel pets. Breeding programs often aim to maintain the frizzle trait while ensuring the birds' overall health and well-being.