in my opinion , not such an easy question to answer in a short post,, basicly agree with above 14pc racing in general, but i would vary the amount due to many circumstances i,e the type of racing etc ,,sometimes a breeding mixture can be confused with a rearing mixture , where in my opinion, plenty of protein is needed,,, as in a breeding mix [mating up], sitting,,, less protein ,, yb,s flying over 6 weeks less protein,, b4 this plenty, birds moulting need more protein , after moult less protein etc etc ,, so, really no easy answer