Abstract
Summary
Subcutaneous doses of 2-mg progesterone in 0.1 ml sesame oil twice daily on Day 23 of gestation significantly depressed litter growth, particularly on postpartal Days 4-5, and markedly reduced the number of live pups. Like doses of progesterone on Day 18 had no such effects. Because the latency and duration of crouching behavior remained at least normal, the depressed litter growth in the Day 23 group could not be due to poor nursing behavior. It implicates lactation alone.
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