$Dairying$ is the management of animals for milk and its products for human consumption.

Which of the following statements are the main objectives of animal breeding?
$I$. Improved growth rate
$II$. Increased production of milk,meat,egg,wool,etc.
$III$. Superior quality of milk,meat,eggs,wool,etc.
$IV$. Improved resistance to various diseases
Choose the correct option.

Meat,milk,and eggs mainly provide us with ...... .

The practices concerned with the improvement in animal husbandry include:

If desirable traits (genes) are accumulated,what increases?

In the last how many years has milk and milk production developed as an important trade?