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Release of gastrin and insulin in response to suckling in lactating dogs.

The concentration of gastrin and insulin was determined in peripheral blood of 4 lactating dogs during suckling. Suckling induced an immediate rise of gastrin and insulin levels, twofold and threefold, respectively. A peak was reached at approximately 5 min after suckling was started, and basal levels were reached again within 15-20 min. The increase in gastrin and insulin levels coincided with the let-down reflex, i.e. it occurred when the puppies started to obtain milk from their mothers. Sham feeding and feeding induce a vagally mediated increase of gastrin and insulin release in dogs. We suggest that the changes in the gastrin and insulin levels observed by us in the lactating dogs, reflect a similar vagal activation induced by suckling. Possible effects of the suckling induced release of gastrin and insulin on milk ejection and secretion are discussed.