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Effect of Selenium and Vitamin E Supplementation on Lactate, Cortisol, and Malondialdehyde in Horses Undergoing Moderate Exercise in a Polluted Environment

Effect of Selenium and Vitamin E Supplementation on Lactate, Cortisol, and Malondialdehyde in Horses Undergoing Moderate Exercise in a Polluted Environment

Journal of Equine Veterinary Science 69: 136-144

ISSN/ISBN: 0737-0806

DOI: 10.1016/j.jevs.2018.07.005

The objective was to evaluate the supplementation effect of selenium (Se) and DL-tocopherol (E) on blood lactate (LAC), cortisol (COR), and malondialdehyde (MDA), in horses moderately exercised in a polluted environment. Police horses of Mexico City were arranged in a balanced factorial trial (2 x 2) with repeated measures. Low (L) and high (H) levels of Se and E supplementation were evaluated (LSe, 0.1; HSe, 0.3 mg Se/kg dry matter; LE, 1.6; HE, 2.0 IU vitamin E/kg body weight). Experimental groups were LSeLE, LSeHE, HSeLE, and HSeHE. The study that lasted 77 days was distributed as follows: adaptation (28 days), exercise (28 days, three consecutive days of moderate exercise were alternated with four days of inactivity), rest (7 days), and recovery without supplementation for readjustment to police handling (14 days). Once a week (11 week), blood samples for LAC, COR, MDA, blood selenium (B-Se), and alpha-tocopherol (TOC) quantifications were taken. Data were analyzed with a model for fixed (Se, E, day, and their interactions) and random (the horse nested within the treatment) effects. The relationships between Mexico City's criteria air pollutants (CAPs) concentrations and blood analytes were analyzed by multiple sequential regression analysis. Concentrations of all blood analytes were affected (P < .05) by day while Se affected (P < .05) COR, B-Se, and TOC. No analyte was affected by E (P > .05). Relationships were observed between LAC, COR, MDA, CAP, and day (P < .05). It is concluded that supplementation with high selenium levels could benefit horses exercising in polluted environments. Further research on chemical forms and feeding doses of both Se and E is needed. rights reserved.

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