We have all acquired a taste for salt. In the states they have started the ' salt revolution '. It is said to be doing far more damage than sugar. Yet it is added to everything we eat. The calcium level should be between 2.5 - 4% . Too much calcium can be as detrimental as too little ! IMHO the calcium levels in chia are a little too high for chooks.
You don't need to feed a lot of chia, it is a supplement rather than the base portion of the feed.