subbreed

/ˈsʌbˌbriːd/
noun
  1. A distinct type within a breed of animal, often developed for specific traits.
    • This subbreed of cattle is known for its resistance to heat.
    • Some dog breeders specialize in a rare subbreed of the German shepherd.
    • The Labrador retriever has a subbreed known as the English Labrador.
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