The effect of chlortetracycline hydrochloride on some morphometric parameters of the thyroid gland in lambs
1999
Konova, M. | Levkut, M. (Univerzita Veterinarskeho Lekarstva, Kosice (Slovak Republic)) | Bekeova, E.
The height of follicular epithelial cells, the diameter of thyroid gland follicles, the frequency of epithelial cell height categories and the frequency of follicular diameter categories were measured in the thyroid glands of lambs. This assessment of the glands was made after a daily intake of chlortetracycline hydrochloride (CTCC) mixed in feed either for four weeks or for three months in 26 Slovak Merino lambs. A significant increase in the mean value of follicular epithelial cell height was observed in every CTCC group after low and high intakes of CTCC for four weeks and for three months when compared to the corresponding control groups. The diameter of thyroid gland follicles significantly decreased after low doses intake of CTCC for four weeks and for three months and after high doses intake of CTCC for three months when compared with the corresponding control group.
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