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Effect of severe energy restriction and refeeding on thyroid hormones in bulls



Effect of severe energy restriction and refeeding on thyroid hormones in bulls



Acta Veterinaria Hungarica 43(1): 173-177



Fifty-three Holstein-Friesian breeding bulls (944.99 +- 14.59 kg) were fasted for 4 weeks. The influence of feeding on thyroid hormones was studied by comparing a starting point with a 4-week fasting period and a refeeding period. Blood samples were taken via a jugular vein catheter at 8:00 a.m. one day before, then once every week during, and two times after the fasting period. Plasma thyroxine (T-4) and triiodothyronine (T-3) levels were determined by direct radioimmuno-assay. The concentration of T-4 and T-3 decreased during fasting. The concentration of T-3 increased after refeeding, but that of T-4 did not. These data suggest that fasting is associated with a decrease in the peripheral conversion of T-4 to T-3 and, consequently, less T-4 is converted into T-3.

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Accession: 002604417

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PMID: 7625289



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