Chickens and ducks are widely distributed in the tropics, although their 
genetic improvement through proper breeding and selection has just started.
Present efforts are mainly restricted to chickens and to ascertain extent in 
ducks. However the import of continuously developing strains from temperate 
countries poses a threat to development of indigenous poultry breeds since there 
is wide disparity between the performance of imported and native stock, and this 
gap will increase.
Biotechnological methods e 0g. RFLP technique may be useful for mapping 
genes resistant to diseases and responsible for increased growth and productivity

T. K Mukherjee

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 337–346, 1990
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