The opportunity for genetic improvement through breeding between animals of the same breed is ..........

In which type of breeding are the desired genes accumulated?

In which type of breeding is there an opportunity to combine desirable traits from different characteristics?

What does a reduction in fertility and productivity of animals indicate?

$A$ good breed of cattle means:

$A$ superior female,in the case of cattle,is the $A$ that produces more milk per lactation. On the other hand,a superior $B$ is that $C$ which gives rise to $D$ as compared to those of other males. Here $A$ and $D$ refer to: