I also attribute some of the lower weights to limited selection in the USA. If you are only able to get 2-3 chicks from your 6+ set of hatching eggs or as a trio of day old chicks from the local breeder and the availability makes it difficult to get more, then you aren't likly to be breeing a top 90% weight cockerel to a top 90% weight female. It is more likly you will be breeding average weight birds which will walk you down the latter on weight rather than maintianing weight in the top tier of the genetic potential of the gene pool.
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