Provide information about inbreeding and outbreeding.

(N/A) Inbreeding refers to the mating of more closely related individuals within the same breed for $4-6$ generations.
The breeding strategy is as follows:
$1$. Superior males and superior females of the same breed are identified and mated in pairs.
$2$. The progeny obtained from such matings are evaluated for superior males and females.
- $A$ superior female,in the case of cattle,is the cow or buffalo that produces more milk per lactation.
- $A$ superior male is the bull which gives rise to superior progeny as compared to those of other males.
- Inbreeding increases homozygosity. It is necessary if we want to evolve a pureline in any animal.
- Inbreeding exposes harmful recessive genes that are eliminated by selection. It also helps in the accumulation of superior genes and the elimination of less desirable genes.
- Continued inbreeding,especially close inbreeding,usually reduces fertility and productivity,which is called inbreeding depression.
Outbreeding is the breeding of the unrelated animals,which may be between individuals of the same breed (but having no common ancestors for $4-6$ generations) or between different breeds (cross-breeding) or different species (interspecific hybridization). Outbreeding is the best breeding method for animals that are below average in productivity and growth rate.