Transition

Does anyone have an opinion as to the expected bioavailability of different calcium sources, such as calcium orotate, vs calcium chloride, vs nano particle calcium carbonate or others? The goal would be to rumen protect the best calcium source and glucose powder with mini dose of digestive enzymes, nano particle selenium and nano particle trace mineral at 35% NRC for 10-20 days post fresh only. Please offer opinions and constructive criticism. There is also a tendency to stay organic.