my 11 5 wk old meaties have been on 20% dumor feed until today when the new feed store told me 23% would help them plump, as they seem a touch smaller than I thought they should be(but what do I know-1st timer). had been feeding appx. what they would eat in 12 hrs,like some would suggest so maybe thats why but I went ahead and got the 23% as its the same price as tsc wanted for 20%. my ? is 23% ok or will they not be able to walk in a week(not seriously!) but? also got 17% for layers as thats all they had(usually use 16%)