What would if poultry birds are larger in size and have no summer adaptation capacity ? In order to get small sized poultry birds, having summer in adaptibility, what method will be employed?

Explanation

If poultry birds are large in size it will becomes very difficult to manage their summer adaptability with them.
The programmes of cross breeding between india(indigenous ) nad foreigh (exotic) breeds for variety improvement are focused to develop new varieties for the desirable traits some of them are
(i) Quantity and quality of chicks
(ii) Dwarf broiler parent for commerical chick production for summer adaptation capacity`//`tolerance to high temperature
(iii) Low maintence reuirement
(iv) Improvement in hen housed for eggf production and reduction in the size of the layer with ability to utilise more fibrous , cheap diet formulations using agricultural byroducts.