Growth Values of Proteins from Commercial Animal Products

The need for nitrogenous feeds in the poultry ration has been recognized for many years. In 1898 Wheeler1 reported some work showing the value of proteins from animal products. Since that time many experiment stations have carried on tests comparing the value of the protein in various feeds, including animal by-products, in order to determine satisfactory sources of protein concentrates. Such experiments have been conducted with both growing chicks and mature birds. In 1915 Philips2 in a report on experiments for egg production with mature stock states: “Meat scrap, fish scrap, or skim milk greatly increases the efficiency of the grain and dry mash feed.” At the New Jersey Station3 it was found that when the mash portion of the ration contained 25 per cent of meat scraps there was an increase in egg production of pullets when compared with a ration in which the mash contained 10 per cent . . .