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Effect of dietary iodine on thyroid hormones and energy blood metabolites in lactating goats

Nudda, Anna and Battacone, Gianni and Bomboi, Giovanni Cristoforo and Floris, Basilio Remo and Decandia, Mauro and Pulina, Giuseppe (2013) Effect of dietary iodine on thyroid hormones and energy blood metabolites in lactating goats. Animal, Vol. 7 (1), p. 60-65. ISSN 1751-7311. eISSN 1751-732X. Article.

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DOI: 10.1017/S1751731112001073

Abstract

Aim of this work was to evaluate if long-term dietary supplementation of potassium iodide (KI) to dairy goats can influence metabolic and hormonal parameters. Thirty Sarda crossbred dairy goats were divided into three groups, which were orally administered 0 (control group; CON), 0.45 (low iodine group; LI) or 0.90 (high iodine group; HI) mg of KI/day, respectively. The daily dose of KI (76.5% of iodine) was administered as salt dissolved in water for 8 weeks. Plasma contents of nonesterified fatty acids (NEFA), urea, glucose, insulin, free triiodothyronine (FT3) and thyroxine (FT4) were determined weekly. Iodine supplementation increased significantly the FT3 hormone (P = 0.007) and FT3/FT4 ratio (P = 0.001) and tended to influence the FT4 hormone (P = 0.059). An iodine level × week of sampling interaction for NEFA (P = 0.013) evidenced a temporary concentration increase in supplemented groups. The ‘Revised Quantitative Insulin Sensitivity Check Index’ increased with KI supplementation (P ≤ 0.01). Blood urea nitrogen (BUN) and insulin were lowered (P ≤ 0.01) by iodine supplementation (groups LI and HI; P ≤ 0.01). The glucose concentration evidenced an iodine level × week of sampling interaction (P = 0.025) due to an unexpected and temporary increase of its concentration in the CON group. Glucose concentration was decreased by KI supplementation only in LI group (P < 0.05). In conclusion, the daily supplementation of low doses of KI can improve insulin sensitivity and decrease BUN in dairy goats.

Item Type:Article
ID Code:8610
Status:Published
Refereed:Yes
Uncontrolled Keywords:Iodine, lactating goats, thyroid hormones, energy blood metabolites, insulin
Subjects:Area 07 - Scienze agrarie e veterinarie > VET/02 Fisiologia veterinaria
Area 07 - Scienze agrarie e veterinarie > AGR/19 Zootecnica speciale
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Medicina Veterinaria
002 Altri enti e centri di ricerca del Nord Sardegna > AGRIS Sardegna, Olmedo
Publisher:Cambridge University Press
ISSN:1751-7311
eISSN:1751-732X
Copyright Holders:© The Animal Consortium 2012
Deposited On:08 Feb 2013 09:11

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