Which of the following is a method used to restore fertility and productivity in an inbred population?
Crossbreeding with animals of a different breed
Inbreeding with unrelated animals
Outbreeding with animals of the same breed
Hybridization with different species
When inbreeding depression arises as an issue, selected breeding population animals should be crossed with animals of a different breed or mated with superior unrelated members of the same breed to restore fertility and yield.
Option 1 is the correct answer.