Experiments on the digestibility of fish /

experiments with men.........-.--Sl Gravy fishes 2 kes serie ane honk aye h ae pobre eee sei) Pebreparanonuronmishbyy wees as sk fess she.eet A sley SALMON sare 'slai ttle serie jcre sala < heveeue Setet teh rae 12 INGYHUIRE Ol OG CCEA a nee 5 a ae ee ee Del PAS ULTIMA years cmice ict cis Scenes re ae 14 Bostonemackenelimeprasssm: Mees case NS 6 INTRODUCTION.While many studies have been made of the digestibility of milk, cereals, fats, vegetables, and meats (especially beef), less information is available regarding the digestibility of fish.Slowzoff?has reported experiments with six persons in which fish was substituted for meat in an otherwise uniform diet to determine its effect on the metabolism of phosphorus, calcium, and magnesium.He found no change in the metabolism of phosphorus; the absorption of calcium was diminished 5 per cent, and the absorption of magnesium was increased 8 per cent.Kifanitsyn* found that the protein supplied by salt cod was 90 per cent digested by human subjects when the fish was eaten -alone and 94.4 per cent digested when eaten as a part of a mixed diet.Rozov,* in a study of the relative digestibility of the fat of smoked .and fresh smelt, found that it was 98 per cent utilized in the smoked and 97 per cent in the fresh.Slowzoff and Krawtschenko® report 1 Prepared under the direction of C. F. Langworthy, Chief, Office of Home Economics.