Release and Restoration of Pituitary Lactogen in Response to Nursing Stimuli in Lactating Rats.

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Abstract
The effects of nursing stimuli upon release and subsequent restoration of lactogenic hormone from the hypophysis was studied in 2 strains of lactating rats on 14th day post-par turn. Wistar lactating rats produced litters which, when 14 days old, were almost as heavy as those of the much larger Sprague-Dawley mothers. There was 15% more pituitary gland/100 g in Wistar rats which, after 10 hours isolation of mother and litter, assayed 30% more lactogen than pituitaries of Sprague-Dawley mothers (3.50 and 2.44 units/100 g, respectively). The Reece-Turner pigeon intradermal method of assay was used. Following 30 minutes nursing there was a greater discharge of lactogen (33%) in Wistar (1.16 units/100 g) than in Sprague-Dawley rats (0.78 unit/100 g). About 1/2 prenursing level was restored in both strains within 2.5 hours postnursing but in one strain tested (Sprague-Dawley) restoration to prenursing level did not occur even 9.5 hours postnursing.

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