Discuss briefly how pure lines are created in animal husbandry.

(N/A) In animal husbandry,pure lines are created through a process called inbreeding.
Inbreeding involves the mating of more closely related individuals within the same breed for $4$ to $6$ generations.
This process increases homozygosity,which is essential for the development of pure lines.
Continued inbreeding helps in the accumulation of superior genes and the elimination of less desirable genes,although it may also lead to inbreeding depression if continued for too long.