Which of the following increases the fertility and productivity of cattle?

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Continuous close inbreeding

Mating between unrelated individuals of same breed

Interspecific hybridisation

Mating between superior cow and inferior bull

answer is B.

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Detailed Solution

Continued inbreeding, especially close inbreeding, usually reduces fertility and even productivity. This is called inbreeding depression. Out-crossing helps in overcoming inbreeding depression. It is the best breeding method for animals that are below average in productivity in milk production, growth rate in beef cattle, etc. 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. The offspring of such a mating is known as an out-cross.

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