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Changes in Serum Thyroid Hormone Levels in Newborn Calves as a Diagnostic Index of Endemic Goiter.

2001; Japanese Society of Veterinary Science; Volume: 63; Issue: 2 Linguagem: Inglês

10.1292/jvms.63.175

1347-7439

Ken­ichi Takahashi, Eiji Takahashi, Rio John T. Ducusin, Shigeyuki TANABE, Yuji UZUKA, Takao SARASHINA,

Growth Hormone and Insulin-like Growth Factors

Maximum serum thyroxine (T4) and triiodothyronine (T3) levels of healthy calves were seen at 1 day after birth, and thereafter rapidly decreased until 5 days after birth. They stabilized until 2 weeks after birth, then gradually decreased until 4 weeks after birth. Serum T4 levels of calves with endemic goiter tended to be lower than those of healthy ones, but showed similar levels to those of adult cows. T3 levels of calves with goiter were similar to those of healthy ones, but showed higher variation. T4/T3 ratio of calves with goiter were significantly lower than those of healthy ones and adult cows. While individual levels of serum T4 and T3 at just after birth could not be considered as a diagnostic index, the T4/T3 ratio could be adopted as a diagnostic index of endemic goiter.