Which of the following is a beast of burden?

Choose the correct statement regarding inbreeding.

Assertion $A$: Milk is a useful product used as a valuable food.
Reason $R$: It is the fresh natural secretion of the mammary glands of female mammals for the nourishment of their young ones.
Which option is correct for Assertion $A$ and Reason $R$?

Animal breeding is primarily carried out through how many methods?

Which activities are covered in the dairy industry?

Which type of breeding should be performed to obtain the desired traits from two different species of animals?