The use of hybrid chickens under free-range rural conditions has often been studied, notably in Zimbabwe , Sri Lanka, Zambia and Nicaragua.
It has consistently been found that entire flock replacement programs lead to increased egg and meat production, but only where management supplies, good nutrition and veterinary hygiene.
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There is, however, one great disadvantage, in that the use of commercial hybrids to increase egg production necessarily eliminates broodiness of hens, due to the negative genetic correlation between these two factors.
For this reason, complete replacement of local birds should not be considered unless a reliable local supply of day-old chicks (of an appropriate breed) is available.
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