What is silage?

Silage supplemented with oil cakes,vitamins,etc. makes up good feed for rearing breeds of . . . . . . .

$A$ - Inbreeding refers to the mating of more closely related individuals within the same breed.
$B$ - Inbreeding increases heterozygosity only.

Assertion $A$: Agriculture began thousands of years ago.
Reason $R$: Animal husbandry includes dairy farming,poultry farming,beekeeping,and fisheries.
Which option is correct for Assertion $A$ and Reason $R$?

What is the primary objective of animal breeding?

Why are bullocks more docile than bulls?