This is an interesting hypothesis. It wouldn't even have to be changing percentages of ingredients, it could simply be the result of increased agricultural efficiency and yields. 100 calories worth of corn feed is quite likely to be subtly different in composition today than decades ago.
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This is an interesting hypothesis. It wouldn't even have to be changing percentages of ingredients, it could simply be the result of increased agricultural efficiency and yields. 100 calories worth of corn feed is quite likely to be subtly different in composition today than decades ago.
Yes, pesticides and packaging are thought to be possible factors too.