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I also find that parent raised birds grow faster.
Parent-raised babies get some of their parents' digestive juices with every meal. Handfed babies don't. It probably helps them digest the food more efficiently and/or the food is somewhat predigested before the babies get it. Either way it gives them the opportunity to get more out of the food.
I imagine they'd be getting the enzymes. Have you seen pigeon milk that they produce the first few days for their squabs!? Crazy