“…In experiments conducted several years ago, large increases in growth and feed efficiency of chickens resulted from the addition of fish meal to diets in the place of soybean meal on a weight or protein basis (Matterson et al, 1951;Saxena and Mc-Ginnis, 1952;Ringrose and Potter, 1952;Branion and Hill, 1953;Matterson et al, 1953). In more recent experiments in which fish meal was added to the diet in such a manner as to keep protein, calcium, available phosphorus and energy constant, the weights and feed efficiencies of chickens were essentially the same in most instances except where fish meal was apparently very high in protein quality (Harms et al, 1961;Runnels et al, 1961;Bird et al, 1962). In more recent experiments in which fish meal was added to the diet in such a manner as to keep protein, calcium, available phosphorus and energy constant, the weights and feed efficiencies of chickens were essentially the same in most instances except where fish meal was apparently very high in protein quality (Harms et al, 1961;Runnels et al, 1961;Bird et al, 1962).…”