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- W2092893275 abstract "ABSTRACT Lambs originating from Suffolk, Milksheep and Texel crossbreeds were injected with saline, 500 μg ovine prolactin or 500 μg ovine GH within 30 min of parturition ( n = 10). Birth weight was negatively correlated with plasma concentrations of reverse tri-iodothyronine (rT 3 ) but not with thyroxine (T 4 ), free T 4 (expressed as the free thyroxine index) or cortisol. At birth, T 3 and T 4 plasma concentrations were high and remained high during the 3-h observation period. After 3 h a significantly lower rT 3 concentration was found. The cortisol concentration at birth was also high (100–400 nmol/l) but decreased rapidly to basal values after 1 h. An injection of 500 μg prolactin after parturition did not influence the hormonal parameters studied except for rT 3 where, after 2 h, lower plasma concentrations were found compared with controls. Growth hormone raised T 3 levels from 4·80 ± 0·44 ( s.e.m. ) nmol/l at birth to 6·74 ± 0·42 nmol/l at 1 h after birth ( P < 0·01) and to 6·51 ± 0·42 nmol/l after 2 h ( P < 0·05). At both times these values were significantly ( P < 0·001) different from saline-injected controls. GH decreased rT 3 from 6·77 ± 0·71 nmol/l at birth to 5·42 ± 0·54 nmol/l after 1 h ( P < 0·05) and to 5·10 ± 0·45 nmol/l after 2 h ( P < 0·01; values were also significantly different from saline controls at P < 0·05 and < 0·005 respectively). At the same time total and free T 4 concentrations were increased. No influence of prolactin or GH injection on plasma cortisol concentrations was seen. It is concluded that GH may play an important role in the maturation of thyroid functions during the perinatal period of lambs by increasing T 4 secretion and by increasing the conversion of T 4 to T 3 and decreasing the T 4 to rT 3 conversion rates. J. Endocr. (1986) 109, 215–219" @default.
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- W2092893275 date "1986-05-01" @default.
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- W2092893275 title "Thyroid function in newborn lambs: influence of prolactin and growth hormone" @default.
- W2092893275 doi "https://doi.org/10.1677/joe.0.1090215" @default.
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