Enzyme Supplements to Poultry Feeds

IT HAS always been understood that the limited digestive capacity of growing birds makes the use of a bulky feed undesirable. With optimum levels of protein, minerals and vitamins, the best results have been obtained on growth and feed efficiency with feeds having a low fiber content. In terms of specific gravity a good, medium-priced growing mash should weigh 60 to 70 pounds per bushel. Low-priced feeds generally are more bulky and contain a large percent of fiber. With the gradual disappearance of heavy feed ingredients from the market and the use of more fibrous products, the weight per bushel of growing mashes has been lowered to around 50 to 55 pounds. The results as expressed in terms of growth and feed efficiency have been somewhat lower than standard. Vegetable protein supplements have replaced animal by-products, fine ground alfalfa stem meal has replaced alfalfa leaf meal, ground oats has replaced . . .