Cross-breeding is the common method used for increasing the production among poultry, fisheries, and bee-keeping.
The exotic species of the fowls, fishes, and bees with desirable traits are selected and allowed to breed with the local breeds of desirable characters. This technique produces offsprings with specific traits having a higher yielding capacity.
In case of poultry, such breeds of fowls that are produced have the following traits:
(a) A higher egg production.
(b) Better quality meat.
(c) Immunity against various pathogens. In case of fisheries, breeding of fish is done to improve the nutritional content of fish and to increase its production.
In case of bee-keeping, a high honey-yielding breeds are selected and grown artificially to have a higher honey production.