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PAPER SELECTED

The effect of chlortetracycline hydrochloride on some morphometric parameters of the thyroid gland in lambs

KONOVA M, BEKEOVA E, LEVKUT M
Veterinarni Medicina 44, 1999, 193-197

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. The samples of the glands were processed using a standard histological procedure for light microscopy and morphometric measurements were made with a calibrated screw micrometer. 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 (aged 2 months at the beginning of the treatment). Each CTCC group of animals was sacrificed at the same time as the corresponding control group of animals. In one group, the 28 mg CTCC per kg of body weight per day (low dose group) were administered for four weeks (CTCC group n = 3


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