Although genetics determine the color of a cat there are some environment elements that can influence the color and is perhaps most noticeable in black cats. There are several reasons why some black cat's fur turns red. These include a copper deficiency, an excess of zinc, thyroid, kidney and liver problems or a lack of Tyrosine in your cats system. All of these problems lead back to the amino acid that is tyrosine.
The first sign of a copper deficiency in your cat is shown by the color of the fur. Copper is important to your cats system as it helps the tyrosine do the work it was intended to do and that is working as a pigment factor. Tyrosine cannot work without certain other factors in your cats system. When there is an alteration to your cat's tyrosine the color of your cat's fur will change. Copper works with tyrosine to keep the proper genetic color in your cat's coat. A copper deficiency can also change the tyrosine levels which in turn may change the texture of your cat's coat.
Too much zinc
When too much zinc is present in our cats system it can interfere with the amount of copper your cat has by decreasing it. This is a cycle as the abundance of zinc will cut down on the amount of copper which will cause color change in your cat's fur. Too much zinc in your cats system can cause a deficiency in copper. Therefore the result would be a different color in the cat's coat.
Thyroid, liver and kidneys
Once again the functions of these organs all deal with tyrosine. The thyroid needs tyrosine to make a substance known as thyroxin. This is a hormone produced by the thyroid glands in cats. The same applies to the liver and kidneys that all interact with tyrosine to keep your cat healthy and his coat looking as it should be. When tyrosine is affected by other substances in your cats body the result is color change in the fur.
Tyrosine is an amino acid that determines color. Without tyrosine there is no color which leads to albino animals. There is no melanin which is crucial to making color. If tyrosine is under or over the levels it should be at in your cats system it will interfere with the color of your cat's fur and an over abundance can lead to tumors. This is a very important part of your cat's enzymes and cannot be reproduced.
If your cat’s fur is changing a visit to your veterinarian is your best option. He can tell you the exact cause of the reason your cats fur is changing. It is the safest way to confront the problem. Your veterinarian can give you a diagnoses and advice on how you should proceed with the treatment of the change of color in your black cat.