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a
More closely related individuals within the same breed for 4-6 generations.
b
Animals within the same breed but having no common ancestors on either side of their pedigree up to 4-6 generations.
c
Superior males of one breed with superior females of another breed.
d
Male and female animals of two different but related species
answer is B.
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Detailed Solution
Out-crossing is the practice of mating of animals within the same breed but having no common ancestors on either side of their pedigree up to 4-6 generations.