Relationship between Thyroid Hormones and Blood Contents of Zinc and Copper of Sheep at Different Physiological Status

Document Type : Original Article

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Department of Animal Medicine, Faculty of Veterinary Medicine, BeniSuef University, Beni Suef 62511, Egypt.

Abstract

This study was conducted to determine the correlation between the levels of thyroid hormones (T3 and T4) and the levels of  blood  contents of zinc (Zn) and copper (Cu) of 100 sheep from two different farms (50 sheep/each). Each group of them subdivided into 5 subgroups (ten animals/each). Blood samples were collected for estimating the concentrations of T3, T4, Cu and Zn. Results showed that T3 and T4 levels were significantly higher (p<0.01) in lambs than in other sheep in both groups (A and B). Serum levels were significantly lower (p<0.01) in males than in other females in group A and significantly higher (p<0.01) in lambs than in other adult in group B. Serum copper levels were significantly higher (p<0.01) in males than in group A. A strong linear positive correlation was found between blood Zn levels and T3 and T4 levels in the lambs of group A (significant at 0.01). A strong linear negative correlation was found between blood Zn levels and T3 and T4 levels in the males and non-pregnant of group A (significant at 0.01). The Cu levels in blood showed a strong linear positive correlation with T3 and T4 levels in the pregnant ewes of group A (significant at 0.01) and the males of group B (significant at 0.01). A strong linear negative correlation was observed between blood Cu levels and T3 and T4 levels in the non-pregnant ewes of both groups A and B (significant at 0.01).

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