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Freemartinism in replacement ewe-lambs of the Ripollesa sheep breed
Pilar Marí1, Joaquim Casellas2,*
15th course student of the Veterinary Science degree, Autonomous University of Barcelona, 08193 Bellaterra, Spain
2Department of Animal and Food Science, Autonomous University of Barcelona, 08193 Bellaterra, Barcelona, Spain
Correspondence to: Tel: +34-93-581-4225; Fax: +34-93-581-1494; E-mail: joaquim.casellas@uab.cat
Received: May 14, 2018; Revised: August 28, 2018; Accepted: September 3, 2018; Published online: October 8, 2018.
Abstract
The freemartinism syndrome affects almost all female calves born co-twin to males, whereas little is known about sheep females. Within this context, a total of 1,185 ewe-lambs from the Ripollesa sheep breed where genotyped for the oY1 polymorphism (non-autosomal region of the Y chromosome). Neither ewe-lambs from single birth (856) nor ewe-lambs from all-female multiple births (170) revealed as freemartin, whereas five out of 159 ewe lambs from multiple births with male co-twins were freemartin (3.15%±1.38%); all those freemartin ewes were confirmed by physical examination of external genitalia. This confirms a low incidence of freemartinism from heterosexual twin pregnancies.
Keywords: freemartin, Ripollesa breed, sheep


© 2018 The Korean Society of Veterinary Science.