A strain of exotic chicken (egg type) was crossed with the local Tanzanian type over two generations. The first crossbred generation (F ) grew faster and reached sexual maturity at an earlier age than any of tJie parental strains, but was intermediate in egg number and egg weight. In the next generation, F (from F^ x F^) was below midparent mean in growth rate, but much above both parents in egg number. Backcrosses were similar to the sire breed in growth rate and intermediate between the sire breed and F in egg number and egg weight.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XVI. Poultry, fish and horse genetics and breeding, growth and reproduction, immune response and disease resistance., , 62–64, 1990
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