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PAPER SELECTED

The effect of superfluous iodine intake and strumigenic factors on histometric parameters of thyroid gland in layers

TRAVNICEK J, KROUPOVA V, KRATOCHVIL P, KRABACOVA I
Veterinarni Medicina 44, 1999, 177-182

The effect of a 74-day increased iodine intake in form of KI on weight and histometric parameters of thyroid gland was studied in four groups of layers (n = 11) of the laying hybrid Brown Hisex at the beginning of the first laying cycle. Control group (A) received ad libitum complete feed mix N-1 containing 0.3 mg I/kg. Experimental groups received feed mix N-1 enriched with iodine as follows: 3.5 mg I/kg feed in group B, 1.3-10 mg in group C and 7-15 mg in group D. Differentiated iodine supplements had statistically significant effects (P < 0.01) on the height of follicular cells-thyreocytes that decreased with the increasing iodine load of layers (A: thyreocyte height 4.11 mu m, B: 3.96, D: 2.67)


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