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Maternal nutrition and progeny performance It has been stated that breeder diets are fed energyand nutrients to optimize egg production, and to eventually maximize chick numbers from every hen. In the sequence of events following embryo development, protein and energy are first obtained from the yolk, and derive from the albumen only after 14 days of incubation. Minerals are also primarily obtained from the yolk and from the shell only after the chorioallantoic circulation is established. Bonemineralization process requires phosphorus, derived from yolk phosvitin, which reacts with calcium from the shell. Intense metabolism, involving carbonic acidand enzymes, is in effect for mineral removal from the egg. During this process, it is very likely that other important minerals for the embryo, such as magnesium, copper and zinc, are also solubilized.
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