Abstract
In this study, iodine and thyroxin (T4) concentrations in the serum of 69 horses were investigated. Higher iodine concentrations were obtained from the horses housed in Chiba Prefecture. In contrast, T4 concentrations of horses at Shizuoka Prefecture were higher than those of horses at Chiba Prefecture. There was a significant correlation (r = 0.643, P < 0.001) between the iodine and T4 concentrations of horses at Saitama and Shizuoka prefectures. Although a significant correlation (r = 0.794, P < 0.001) was also observed in the investigation of all horses at Chiba Prefecture, the distribution area of the data was separated from the data of horses housed in Saitama and Shizuoka prefectures. A higher iodine concentration in the environment is expected in the sampling area at Chiba Prefecture. Thus, it was suggested that the concentrations of iodine in the serum of horses are influenced by geological differences. It was thought that equine serum is a useful sample for monitoring.
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Acknowledgments
The authors express their thanks to Mr. Takanori Ban at the Green Hill Riding Club, Ms. Tomoko Yoneya at the I’ll Horse Riding Club, Ms. Keiko Hasegawa at Minimini club, and Mr. Yasuhiro Nakajima, Ms. Kumi Sato, and Ms. Yuko Yokoi at the Palomino Pony Club for their help in sample collection. This study was supported by Grant-in Aid number 23580430 from the Ministry of Education, Science, Sports, Culture and Technology in Japan.
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The present study was conducted following the ethical policies of the Nippon Veterinary and Life Science University, Japan, for experimental animals.
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Mochizuki, M., Hayakawa, N., Minowa, F. et al. The concentration of iodine in horse serum and its relationship with thyroxin concentration by geological difference. Environ Monit Assess 188, 226 (2016). https://doi.org/10.1007/s10661-016-5221-7
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DOI: https://doi.org/10.1007/s10661-016-5221-7