Composition of the milk of the common marmoset (Callithrix jacchus) and milk substitutes used in hand-rearing programmes, with special reference to fatty acids.

Analyses of marmoset (Callithrix jacchus) milk were carried out to determine values for crude protein, lactose, total lipids, major minerals, and osmotic pressure. Mean values were (g/100 ml): protein, 3.6; lactose, 7.5; total lipids, 7.7; minerals (mg/100 ml): sodium, 21.4; potassium, 54.3; calcium, 92.2; phosphorus, 22.8; magnesium, 5.0; chloride, 52.2; osmotic pressure, 354 mosm/kg water. Similar analyses were conducted on 2 milk substitutes used in hand-rearing programmes. Fatty acid analyses were carried out on natural milk, the milk substitutes, and the marmoset diet. For hand-rearing C. jacchus it is recommended that a human milk substitute is modified by increasing the levels of protein, carbohydrate, and total lipids, and that a small amount of fish oil is added.