Introduction:
A group of animals (within a species) related by descent and similar in most characters like general appearance, feature, size, configuration are said to be a "breed". There may be considerable differences between individuals, still they as a group have many common points which distinguish them from other groups or breeds. Thus, breed is a group of animals within a species having common characteristics. The purity of the breed is maintained by confining mating of animals within the breed. A strain is a similar homogenous group having some similarity, but not recognized as a breed. Although we have large number of breeds in each livestock species, majority of the animals in each species are non-descript. Non- descript animals do not belong to any particular breed and repsent the admixture of a number of types which & yet to be purified and fixed by judicial mating programme
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