ISSUE, May. Vol.52 - 2 - 2020. Austral Journal of Veterinary Sciences, [S.l.], v. 52, n. 2, p. 45-69, may 2020. ISSN 0719-8132. Available at: <http://australjvs.cl/index.php/amv/article/view/1029>. Date accessed: 04 june 2020.