How are high yielding breeds of poultry advantageous over indigenous seeds?

How are high yielding breeds of poultry advantageous over indigenous seeds?

Exotic varieties have some of d following desirable traits :

1. Number and quality of chicks.
2. Dwarf broiler parent for commercial chick production.
3. Tolerance to heat.
4. Low maintanence requirements.
5. Reduction in the size of the egg laying bird with ability to utilise more fiborous diets.