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I would also wonder if prior to the advent of barn lighting and specalized laying breeds, if ducks in the past were seasonal layers more so than chickens. We have ducks laying 300+ eggs a year, but we also have chickens weighing 8 lbs in 8 weeks or less. When these animals were being utalized in the past, did the 300+ duck eggs a year breeds exist? The 8lbs or more chickens didn't exist till the last 40-60 years with specific breeding programs.
the growth rate study I referred to earlier put the pekins they used at 3.4kg( or roughly 7.3lbs) at eight weeks, while the chickens(referred to in the text as "developed from White Cornish and White Plymouth Rock", so a cornishX of some sort) they list at2.2kg(4.9lbs) at the same age... now they list weights up to 26 weeks on the chickens( over 5.3 kg at that point, or 11.7 lbs) so I am assuming they were using a slower growing strain( their goal was to compare the growth curves of different domestic poultry species through maturity, so I am assuming they didn't want their chicken group dropping dead from health problems halfway through... and for some reason, they only used females... not certain why, they weren't really clear on that)... but it does show that ducks have the potential to match our commercial broiler chickens in growth..
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