Deprivation, weight loss and intake in the rat as a function of age: Evidence for an obligatory growth factor

When milk infusions were made through oral cannulas located in the front of their mouths, rat pups from 1 to 20 days of age actively ingested the diet, and their intake was related to the length of deprivation. Pups decreased their ingestive responding after they had consumed large volumes of milk. In addition, 1-, 3-, and 6-day-old pups, when 24 hr deprived, exhibited an intense behavioral activation in response to milk infusion. The behavioral activation appeared to be stimulated primarily by taste and the opportunity to swallow. Milk infusions did not produce activation in older pups; their behavior was more exclusively ingestive and food directed. These experiments demonstrate that (a) from birth, rat pups are capable of an active form of ingestion, independent of normal suckling from the mother; (b) such ingestion is controlled by physiological factors; (c) food has arousing properties in young animals; and (d) as pups grow older, their ingestive responding is refined from a generalized and nondirected activation to specific and directed feeding responses.The study of the development of inges-1973;Houpt & Houpt, 1975; Lytle, Moortive behavior and its controls has focused on croft, & Campbell, 1971). An implicit asthe emergence of independent feeding at sumption of much of this work has been that weaning (Anderson & Patrick, 1934; Bolles suckling behavior represents a precursor to

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The ontogeny of feeding in rats: I. Ingestive and behavioral responses to oral infusions.

Hall

1979

Journal of Comparative and Physiological Psychology

238

182

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Deprivation, weight loss and intake in the rat as a function of age: Evidence for an obligatory growth factor

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The ontogeny of feeding in rats: I. Ingestive and behavioral responses to oral infusions.

The ontogeny of feeding in rats: I. Ingestive and behavioral responses to oral infusions.

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