Selenium metabolic status and response to supplementation in grazing Chilean-Criollo horses
Journal Title: Revista MVZ Cordoba - Year 2013, Vol 18, Issue 3
Abstract
Objective. Two experiments were conducted to determine the selenium status in grazing Chilean-Criollo horses and evaluate their response to a Na2SeO3 supplement. Material and methods. Exp.1The blood activity of glutathione peroxidase (GPx, EC.1.11.1.9) (AcGPx) was determined in horses kept grazing in 10 breeding farms from the south of Chile: PO, n= 40 horses were kept grazing during autumn (PO), 47 horses were kept grazing during autumn and supplemented with oat grain (PO+A), and 23 horses were kept grazing during spring (PP). Exp.223 horses kept on pasture were allotted into three groups: G1, n=7, supplemented with a dose of Na2SeO3 (Se= 0.05mg/kg bw, im) on day 0; G2, n=8, supplemented with similar doses of Na2SeO3, on days 0 and 15; and GC, n=8, control. AcGPx was determined on days 0, 30 and 120. Results. Median (Me) of the AcGPx on all the farms were below the adequate limit (>130 U/g Hb), being higher in PO+A (Me= 92, P25%= 47, P75%= 129 U/g Hb) and PP (Me = 85, P25%= 45, P75%=114 U/g Hb) than PO (Me= 35, P25%= 20, P75%= 85 U/g Hb) (p<0.05). Initial AcGPx was similar and below adequate in the three groups and increased after Na2SeO3 administration (p<0.05) in G1 (121 ± 52 U/g Hb) and G2 (124 ± 69 U/g Hb). Conclusions. A deficiency is observed in Chilean-Criollo horses grazing during autumn and spring in southern Chile, parenteral administration of Na2SeO3 (0.05mg/kg bw) in single or double doses improves the Se status without achieving adequate values.
Authors and Affiliations
Macarena Rioseco H, M. Sc| Universidad Austral de Chile, UACh, Instituto Ciencias Clínicas Veterinarias, Casilla 567, Valdivia, Chile., Mirela Noro, Ph. D *| Universidad Austral de Chile, UACh, Instituto Ciencias Clínicas Veterinarias, Casilla 567, Valdivia, Chile.Universidade Federal do Pampa, UNIPAMPA, Curso de Medicina Veterinária, Uruguaiana, Brasil.Correspondencia: mirelanoro@gmail.com, Ricardo Chihuailaf V, Ph. D| Universidad Católica de Temuco, Escuela de Medicina Veterinaria, Temuco, Chile., Fernando Wittwer M, M. Sc| Universidad Austral de Chile, UACh, Instituto Ciencias Clínicas Veterinarias, Casilla 567, Valdivia, Chile.
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