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Hypergravity effects on litter size nursing activity prolactin tsh triiodothyronine and thyroxine in the rat


, : Hypergravity effects on litter size nursing activity prolactin tsh triiodothyronine and thyroxine in the rat. Aviation Space & Environmental Medicine 55(12): 1129-1135

Hypergravity (HG) adapted rats were tested for mating ability, gestational time, fetal and newborn mortality, and nursing performances. Plasma and pituitary PRL [prolactin] and TSH and plasma T3 [triiodothyronine] T4 [thyroxine] were determined during 48 h peripartum. No difference was noticed in mating ability and gestation time. The number of fetuses was reduced in the HG rats (1 g-12.9 .+-. 0.5, 2.16 g-10.5 .+-. 0.4, 3.14 g-9.4 .+-. 0.5). None of the 3.14 g rats nursed their young, all of which were cannibalized. Of the 2.16 g rats, 50% nursed their pups, of which only half survived to weaning. The initial pituitary PRL of HG rats was lower than 1 g, but it increased postpartum, while the plasma PRL, which was very low, continued to decrease. Only postpartum was there a difference in plasma PRL between rats that previously nursed and those which did not nurse at 2.16 g. HG rats had lower T3 levels, indicating a hypermetabolic state during the peripartum, which worsened their normal relative hypothyroid state of pregnancy. Exposure of pregnant rats to HG above 3 g has a lethal effect on the fetuses and newborns. Maternal PRL and T3 changes are possible reasons for this.

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