(b) Differentiate between out crossing and cross breeding.

Explanation

(i) Outcrossing: Outcrossing is the practice of mating of animals of the same breed,but that have no common ancestors on either side of their pedigree upto 4-6 generation. The offspring of outcrossing icalled an outcross. A single outcross helps to overcome inbreeding depression. It is the best breeding method for animals that are below average in productivity and growth rate . (ii) Cross-breeding : It is a method of outbreeding in which superior male of one breed are mared with the superior females of another breed of the same species. This helps in combining the desirable quanlities of the two different breeds into the hybrid progeny. The hybrid progeny may be directly used for commercial production or they may be subjected to some form of inbreeding and selection, to develop new stable breeds. One example of cross-breeding is Hisardale, a new breed of sheeo developed by crossing Bikaneri ewes and Marino rams.