Acta Univ. Agric. Silvic. Mendelianae Brun. 2013, 61(5), 1365-1369 | DOI: 10.11118/actaun201361051365

The effect of iodine and strumigens long-term foodborne intake on histometrical parameters of thyroid gland in gimmers

Zdeněk Peksa1, Jan Trávníček1, Roman Konečný1, František Jelínek2, Hana Dušová1, Kateřina Volfová3, Aneta Vrbová3, Luboš Zábranský1, Daniel Falta4, Václav Pálka1
1 University of South Bohemia, Faculty of Agriculture, Department of Veterinary Disciplines and Quality of Products, Studentská 13, 370 05 České Budějovice, Czech Republic
2 Veterinary Histopathological Laboratory, Sojovická 16, 197 00 Prague 19, Czech Republic
3 University of South Bohemia, Faculty of Agriculture, Department Animal Husbandry, Studentská 13, 370 05 České Budějovice, Czech Republic
4 Mendel University in Brno, Faculty of Agronomy, Department of Animal Breeding, Zemědělská 1, 613 00 Brno, Czech Republic

In 2010 and 2011 two experiments on gimmers of Šumava mountain sheep were performed. The first experiment was carried out on 12 animals (experimental period was 11 months); control group was fed with 3 mg I*kg-1 in dry matter per day and experimental group was fed with 5 mg I*kg-1 in dry matter per day. The second experiment lasted 10 months and it was carried out on 12 animals. Feed ration for control group contained 10 mg I*kg DM-1. Feed ration for experimental group contained 10 mg I*kg DM-1 too; moreover it included rapeseed meal and 1 g of sodium nitrate. The aim of the first experiment was focused on impact of high iodine intake on structure of thyroid gland. The aim of the second experiment was to discover effect of strumigens during high iodine intake on structure of thyroid gland. The animals were slaughtered after the experiment and there was executed the dissection of thyroid gland. The samples of thyroid gland were processed during classic paraffin method and dyed with haematoxylin and eosin. For finding of histometrical parameters was used program Leica IM 500 Version 4.0. The length, the width and the area of follicles were measured. The follicles were divided into three groups after this procedure (by the length); in each group were measured 20 thyreocytes. In group with intake 5 mg I*kg DM-1 (experiment from year 2010): higher weight of thyroid (p < 0.01), significant higher (p < 0.05) proportional representation of large and medium follicles, significantly (p < 0.05) higher average size of follicles, demonstrably lower (p < 0.05) height of epithelium were found. There were not found any differences in monitored parameters between the groups from experiment which was carried out during the year 2011. After comparing results from the both experiments significantly higher percentage representation of large follicles a significantly lower representation of small follicles, distinctly higher average size and higher height of epithelium in all size categories, in groups with iodine intake 10 mg I*kg DM-1was found (from second experiment - year 2011).

Keywords: follicle, epithelium, thyreocyte, rapeseed meal, nitrates, morphometry
Grants and funding:

This work was supported by grant NAZV QH 81 105, GAJU 011/2013/Z and IGA AF MENDELU TP 2/2013.

Received: May 20, 2013; Published: September 28, 2013  Show citation

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Peksa, Z., Trávníček, J., Konečný, R., Jelínek, F., Dušová, H., Volfová, K., ... Pálka, V. (2013). The effect of iodine and strumigens long-term foodborne intake on histometrical parameters of thyroid gland in gimmers. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 61(5), 1365-1369. doi: 10.11118/actaun201361051365
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