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I've seen that JR mix before when browsing German pages, some of the JR products just don't seem to be available here in the UK or maybe anywhere outside Germany which is a shame, it does look good but there's no information about levels of protein, fat or fibre which is important to know if you want to use something as a main feed.
It is a bit overwhelming when you first start thinking about making your own mix but it's well worth doing all the research & very rewarding if you do have a go once you feel ready