The effect of superfluous iodine intake and strumigenic factors on histometric parameters of thyroid gland in layers
1999
Travnicek, J. | Kroupova, V. | Kratochvil, P. | Krabacova, I. (Jihoceska Univ., Ceske Budejovice,Czech Republic. Zemedelska Fakulta)
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 of the laying hybrid Brown Hisex at the beginning of the first laying cycle. Differentiated iodine supplements had statistically significant effects on the height of follicular cells-thyreocytes that decreased with the increasing iodine load of layers; the effects on follicle increase were insignificant. The thyroid weight was not influenced by higher iodine intake. The state similar to colloid struma was described in some cases in experimental groups. The effect of differentiated additive intake of iodine on the iodine supply to the layer organism is documented by its average content in egg yolk in microg/kg of yolk fresh matter. No strumigenic effects of the glucosinolate content in the supplement of soybean meal were observed in layers after 30-day feeding when the parallel iodine intake was 0.3-0.8 mg I per kg of feed N1. No clinical signs of disease were recorded during experiments.
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