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It is entirely based on the cow's genetics and breed. They have spots because their parents had spots or maybe the cow's parents were different breeds and the resulting mixture was spotted colouration. The breed you are thinking of that has spotted cows would most likely be Holstein. Other breeds include Milking Shorthorn, Shorthorn, Texas Longhorn, English Longhorn, Normande, Florida Cracker, Speckle Park, Beefmaster, Simmental-Fleckvieh, Ayrshire, Guernsey, and many more.

If you are talking about a different type of spot like warts or ringworm or mange then your cow is in need of a veterinarian.

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14y ago
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13y ago

Black blotches are a result of the breed characteristics, the DNA of the animal, and the pigmentation of the hair. An example of a breed with black spots is the Holstein. The breed characteristic is black spots, the DNA and the pigments of the hair determine where and how the spots are placed on the body.

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7y ago

Animals have spots that blend into their environment, just as hunters use camoflauge jackets. The spots on the animals have the same affect. It is hard to see them when they are either hunting or being hunted. Household animals have spots from their ancestors. Although camouflage is certainly a factor, certain coat patterns appear to play a role in repelling biting insects.

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11y ago

Not all cows have spots - Holsteins (the large dairy cows common in the United States) have large black spots across their body. Several other breeds, such as British Whites (a beef-type breed that is not as common in the United States) has small black spots across their forequarters.

The spots are likely to be genetic freeloaders. As the cows were bred for some other characteristic, the spots came along because they were physically close to the genetic trait being selected for.

Another hypothesis, which is relatively recent, is the spots may be a marker for some disease resistence. As the cows were bred to produce more milk and stay healthy, the genes that keep the cow healthy may also produce the spots.

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11y ago

Not all cows do, only certain breeds. And it's all due to genetics.

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13y ago

Genetics. Not all cows have spots on their bodies; it all depends on what breed or breed mix they are that determines whether they should have spots or speckles on their body or not.

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12y ago

That all depends on the breed.

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12y ago

No.

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Q: Why do some cows have black blotches?
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