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Fat Accretion during Postembryonic Growth in the Domestic Duck, with Additional Data from the Mallard

The accretion of fat in the homoiotherm body is a growth phenomenon which has special attributes. In particular, dietary and seasonal factors may produce changes in the fat mass in both the immature and the adult animal of a magnitude unparalleled by changes produced in other organs or tissues. These attributes of the growth of the fat deposits arise as a direct consequence of the highly specialized role of adipose tissue in the storage of fat (triglyceride) as a source of chemical energy. The variable nature of fat accretion presents special difficulties in the study of the normal growth of fat deposits during ontogeny. However, certain nidifugous birds, such as those belonging to the family Anatidae, provide the opportunity to study the normal development of the fat deposits in the absence of dietary influences, such as those arising from the effects of parent feeding. In this paper, the pattern of developmental growth of the fat deposits in the domestic duck during postembryonic growth is described and compared with that in the ancestral form, the mallard, Anas platyrhynchos. The term "fat deposit" is used here to refer only to the fat, and the term "fat body" refers to the complete adipose tissue mass, inclusive of both the fat and the tissue.