Resumo

OSORIO, J. H  e  VINASCO, J. COMPARACIÓN DE LOS NIVELES SÉRICOS DE TSH Y T4 UBRE EN BOVINOS. Rev. Med. Vet. Zoot. [online]. 2016, vol.63, n.2, pp.87-94. ISSN 0120-2952.  https://doi.org/10.15446/rfmvz.v63n2.59356.

The present study was aimed to determine the levels of TSH and free T4 (T4L) in cattle differentiated by gender and age, and know their correlation with these variables. Blood samples of 133 bovines F1 were obtained in fasting state, establishing four groups (36 males and 20 females under 18 months and 47 males and 30 females over 24 months). Levels of TSH and free T4 were measured using enzymatic immunoassay. The average of TSH values (pUI/ml) were 1.86 for young and adult females, 1.88 for young males, and 1.99 for adult males. The P-value of test F was greater to 0.05 in all groups; therefore, there is not statistically significant difference, with a 95% confidence. The average of free T4 values (ng/dl) for young females, adult females, young males and adult males were 0.84; 0.62; 0.67 and 0.85 respectively. The P-value was less than 0.05 in all groups, indicating a statistically significant difference, with a confidence of 95%. In conclusion, we found no effect of sex and age on concentrations ofTsH; instead, free T4 levels show statistically significant difference between these variables, finding in the young animals, that females have higher T4 levels, and in adults, males present higher values of T4.

Palavras-chave : Thyroid; TsH; FT4; cattle.

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