I have noticed the majority of the foods regardless of whether they have alfalfa in them all seem to have a calcium level of around 0.8-0.9. The only issue with alfalfa is to do with the calcium but even non alfalfa foods have the same levels of calcium in them? The only one I have seen which is lower is the Oxbow (which can be ordered as click and collect on pets at home) but even that says 0.35 up to 0.8.
As a new owner I am still confused which one is the best to feed. They are currently on science selective which is what they were fed at the rescue, but I also have 2 other non grainless ones which are unopened as not sure whether to switch them.