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  • Title: Distribution between protein-bound and free forms of plasma cortisol in the gilt and fetal pig near term.
    Author: Kattesh HG, Baumbach GA, Gillespie BB, Schneider JF, Murai JT.
    Journal: Biol Neonate; 1997; 72(3):192-200. PubMed ID: 9303219.
    Abstract:
    Thirty-five time-dated pregnant gilts were used to document plasma levels of total and free cortisol, corticosteroid-binding globulin (CBG) binding capacity, and percent distribution of cortisol among protein-bound (CBG and albumin) and free forms in the fetal pig during the last 24 days of gestation. Plasma from fetal pigs on days 110-114 of gestation (gestation length 114 days) had significantly higher levels of total cortisol (p < 0.01), percent albumin-bound and free cortisol (p < 0.10), and free cortisol concentration (p < 0.05) compared to samples on days 90, 100 and 105. Fetal plasma CBG binding capacity increased (p < 0.05) linearly from day 100 to 114. Fetal pigs located in the cervical region of the uterus had lower (p < 0.05) total and free cortisol and higher (p < 0.05) albumin and total protein concentrations compared to fetuses in the middle and oviductal regions. Total, percent free and free cortisol concentrations in maternal plasma on days 105-114 were greater (p < 0.10) than that measured on days 12-100 of gestation. These results suggest that the developmental patterns of plasma cortisol and CBG in the prenatal pig are directly related and highly similar to those of another precocious species, the sheep.
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