There can be a number of reasons why your chicken may turn black, here are some possible reasons:
1. Age: As chickens age, their feather color may also change. The feathers of some breeds of chickens, especially broiler chickens, will gradually darken as they grow.
2. Feed: Certain ingredients or additives in chicken food may affect the color of their feathers. For example, feed containing higher amounts of iron may cause a chicken's feathers to darken.
3. Genes: Some breeds of chickens are born with genes for black feathers, which is one of the reasons why their feathers turn black.
4. Disease: Certain diseases and parasitic infections can cause a chicken's feathers to darken, which is often accompanied by other health problems.
It should be noted that blackening of chickens does not necessarily mean there is a health problem, but if it is accompanied by other abnormal symptoms (such as loss of appetite, weight loss, etc.), you should pay attention and seek a veterinary check in time.
