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- W2007753576 abstract "Sheep foetuses were surgically thyroidectomized at 50-60 days gestation, when thyroid function begins, and the pregnancy was then allowed to continue until 90, 120 or 150 days (term). At these times the foetuses were removed by caesarean delivery, exsanguinated, weighed and dissected. The central nervous system was divided--cerebral hemispheres, brain stem, cerebellum and spinal cord for subsequent analysis. Comparison was made with sham operations on seven foetuses. Thyroidectomy led to a fall in body weight (24.7%) and brain weight (11.7%) at 120 days and 150 days, 31.1% and 24.5% respectively. The hemispheres showed the greatest change and the cerebellum the least. DNA and protein contents were reduced in the hemispheres and cerebellum at 150 days, while in the brain stem and spinal cord the DNA content was not significantly affected. Protein content was, however, reduced indicating a reduced cell size, but not a reduced cell number as in the other two regions. Somatic changes included reduced wool growth, delayed osseous development in the limbs (X-ray assessment) a reduced heart weight (39.1%) and an increased pituitary weight (48.1%). The thyroidectomized lambs failed to survive for more than a few hours after birth or caesarean delivery at 150 days. The findings indicate significant effects of foetal thyroidectomy on brain development in the sheep late in pregnancy along with other evidence of foetal hypothyroidism." @default.
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- W2007753576 date "1979-09-01" @default.
- W2007753576 modified "2023-09-25" @default.
- W2007753576 title "FOETAL THYROIDECTOMY AND BRAIN DEVELOPMENT IN THE SHEEP" @default.
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- W2007753576 doi "https://doi.org/10.1111/j.1365-2990.1979.tb00635.x" @default.
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