Oxbow is a good food, but it is not the only one!
I like using this chart to compare brands:
http://www.therabbithouse.com/diet/rabbit-food-comparison.asp
You can also read more about what to look for in a pellet and how to tell if it has good nutrition here:
https://wabbitwiki.com/wiki/Pellets
There is no one single brand that really is perfect in every category, so it takes some consideration to decide which things are most important for you, and what you might want to balance a bit with the veggies you feed.
Sometimes people try to avoid certain ingredients, but unless you know your rabbit is really sensitive to something then it’s not really necessary to do this at first. You can try a small bag of something and see how your bun does with it.
Looking at the chart, the Kaytee Forti-diet is not the worst food (it has an appropriate amount of Fiber, Protein, and Fat), so I don’t think there is any harm in finishing the bag and then slowly transitioning to another food if you choose to.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.