Breed refers to a set of animals which closely resemble each other in certain marked features by descent. Hence, option A is correct.
Leather is the processed material obtained from the skin and hides of mammals. Cattle hides are the major raw materials for leather production. They are used for the production of soles of shoes, conveyors belts in industries, etc. Hence, option B is incorrect.
India is world's largest producer and consumer of milk and milk based products. 70% of the world's livestock population is present in India and China but the per capita productivity by the livestock in these countries is lower compared to other countries in the world. Hence, option C is correct.
In Italy, donkey dairy farms are in high demand as alternative milk source (mother's milk) for human infants. This milk is highly nutritious. Donkey milk is not very opular in India. So, option D is incorrect.