Adult rabbits are totally fine with alfalfa pellets as long as the content of the ingredients within the pellets is correct. People often say “don’t feed your bunny alfalfa, it’s too high in calcium and protein”. For hay this is true, but in pellets this is not necessarily the case. Science Selective is a perfect example of a pellet having low protein and calcium levels even though the main ingredient is alfalfa, and thus is save to feed the recommended 15-25 grams per kg!
Yes Oxbow is not perfect but if you look carefully the “fault” is pretty small. The calcium (ironically! As this is a thimothy based pellet) and the phosphorus porportions are off: There is not enough phosphorous and according to the minimum value the calcium content is too low and the according to the maximum value the calcium content is too high. Notice these are min and max values. The mode and mean are somewhere in between at a neither too high nor too low value, leaving only the low phosphorous content as fault.
Moral of the story, if you’re looking for the food that’s as close to perfect as possible, you should not feed Oxbow. Does this mean your bunny will be unhealthy if you do feed it? Most likely not, especially when veggies are fed frequently as well. Endive and cucumber have a good amount of phosphorous in it for example. But if you are looking for the most perfect rabbit pellet, Science Selective is definitely one of the contenders.
If you are into trendy stuff; look into grainless pellets. Mainstream rabbit pellets (Oxbow and Science Selective as well) have grains in them because it’s a cheap and easy way to fatten up rabbits. This stems from the past, where rabbits were still used as meat animals. However, grains are actually not that healthy for rabbit guts and some sensitive bunnies can react by getting sticky poop. Recent trends are into grainless rabbit pellets (Science Selective Naturals, Beaphar Nature, Terra Expert) eliminating this unneeded ingredient. I’m still on the fence on swapping from Science Selective to a grainless pellet myself (I’m leaning towards Beaphar Nature) because why wake sleeping dogs, my buns are healthy right now. It may be fun to read up on if you’re interested in picking the best rabbit pellets.