Oxbow CC doesn't taste good. The way you force feed the bun is to put the mixture in a 35 ml (cc) syringe from the big opening (the top), NOT the nozzle, then push the rubber piston back in, then force feed your bun.
I want to point out that I stop using critical care. CC is a board based emergency food for almost any animals, even lizards. What rabbit needs is mostly fiber.
So I come up w/ this simple idea of smashing raspberry or blackberry in a juicer, then cut 1 mm long of hay stem on the blackberry pulp, then put them in 35 ml syringe and force feed the bunny.
I done the above for 12 mth. w/ great success on 1 of my bridge bun Goofball.