Abstract
Daily reduction of the normal (ad libitum) food consumption by as little as 35% significantly reduced (P less than 0.05) the percentage of mice with implantation sites at Days 7 and 9 of gestation. Underfeeding decreased body weight and reduced the weight of the ovaries and uterus. Plasma progesterone was decreased (P less than 0.05) as dietary intake was restricted and was associated with regression of the corpora lutea. No significant alterations in the plasma values of LH and FSH were observed in mice underfed between Days 1 and 9 of pregnancy. The decrease in plasma progesterone in the absence of reduced LH values may indicate that progesterone secretion between Days 5 and 9 of gestation is not controlled solely by LH.
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