I feed FlockRaiser (20% protein) to my bantam flock, is that too much protein for bantams? They're one year old, don't free range (neighbors dogs) and get occasional treats, so the feed is their main food source. They also have free choice oyster shell. I want them to live very long lives and would like to know if the 20% flockraiser is good or bad to feed bantams throughout their lives.