18-Title: Effect of zinc supplementation on thyroid and testosterone hormone in growing kids

Authors: Jonali Devi, J Goswami, BC Sarmah and K Sarma

Source: Ruminant Science (2014)-3(2):217-220

How to cite this manuscript: Devi Jonali, Goswami J, Sarmah BC and Sarma K (2014). Effect of zinc supplementation on thyroid and testosterone hormone in growing kids. Ruminant Science 3(2):217-220.


Effects of organic and inorganic form of zinc supplementation in testosterone and thyroid hormonal profile were studied in growing Assam local kids. Thirty six healthy Assam local male goats of around three months of age and body weights ranging from 3 to 4 kg were selected. The kids were divided into three groups according to the feeding regime as group I (Control group, n=12 numbers) in which animals received concentrate ration without zinc supplementation, while group II (n=12 numbers) and III (n=12 numbers) animals received inorganic (Zinc sulphate@120mg/kid/day) and organic form (zinc propionate @40mg/kid/day) of zinc supplements, respectively with concentrate mixture. Serum triiodothyronine (T3) and thyroxine (T4) concentrations of both the zinc-supplemented groups increased with the advancement of age, while these values of control group decreased with age advanced. As a result of this trend the values of T3 and T4 recorded at the end of experiment (7 months of age) in control (0.83±0.01-T3 and 27.61±0.08 ng/ml-T4) were lowest, while, the inorganic (1.47±0.01 and 53.50±0.23 ng/ml) and organic (1.48±0.02 and 54.68±0.41 ng/ml) zinc-supplemented groups had highest values for these hormones at that stage. Concentration of T3 was significantly higher at 4.5 months stage and T4 at 5.5 months stage and onward in organic zinc-supplemented group than in inorganic supplemented one. Serum testosterone increased in all the groups with advancement of age. But the increase in concentrationwas significantly higher at 4 months and onward stages in organic supplemented group and from 5.5 months onward stages in inorganic supplemented group as compared to control group. Highest testosterone concentrations were (Mean±SE) observed in all the groups at 7 months of age were 0.84±0.02, 1.13±0.01 and 1.14±0.01 ng/ml in control, inorganic and organic zinc-fed groups, respectively. This shows that oral zinc supplementation in organic form induces a better testosterone hormonal surge in Assam goats.


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