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THE LACTATION INTERVAL IN THE MOUSE
1 Animal Breeding Research Department, Edinburgh University
The length of the lactation interval in the mice in these experiments is from 20 to 25 days. It is not affected by an artificially induced prolongation of lactation. Removal of the litter at birth, on the 7th day, 14th day, or 21st day of lactation is followed within 2 to 4 days by
strus in all cases. From a comparative survey of the states of pregnancy, pseudopregnancy, and lactation, it is argued that in all the same hormonal conditions prevail.
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