What is necessary to increase homozygosity?

The $Gaddi$ breed of goat is distributed in which of the following regions?

Which animal makes a significant contribution to milk production in our country?

Statement $X$: In animals,the proportion of homozygosity can be increased in heterozygotes.
Reason $Y$: Inbreeding is performed in animals.

Animal husbandry deals with
$I$. Breeding of livestock like buffaloes,cows,sheep,camels,etc.,that are useful to humans.
$II$. Rearing,catching,selling,etc.,of fish,molluscs,and crustaceans.
$III$. Breeding of fowls for human use.
Which of the statements given above are correct?

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