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I agree antagonistic mineral interactions occur within pre mixed mineral supplementation. This is the talk of Fred Provenza that cracked my mindset and kicked things off for me. Talks about free choice vs mixed ration and the animals ability to self select both minerals and feed ration.

https://www.farmingsecrets.com/store/farming-systems/stipas-7th-national-native-grasslands-conference-3-days/

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