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J Vet Sci 2018; 19(6): 858-861  https://doi.org/10.4142/jvs.2018.19.6.858
Freemartinism in replacement ewe-lambs of the Ripollesa sheep breed
Pilar Marí, Joaquim Casellas*
Department of Animal and Food Science, Autonomous University of Barcelona, 08193 Bellaterra, 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: November 30, 2018.
The freemartinism syndrome affects almost all female calves born as co-twins to male calves, whereas little is known about this phenomenon in female sheep. Within this context, 1,185 ewe-lambs from the Ripollesa sheep breed were genotyped for the presence of oY1 polymorphism (a non-autosomal region of the Y chromosome). Neither ewe-lambs from single births (856) nor ewe-lambs from all-female multiple births (170) were revealed as freemartins, whereas five of 159 ewe-lambs from multiple births with male co-twins were freemartins (3.15 ± 1.38%). All freemartin ewe-lambs were confirmed by physical examination of external genitalia. The results confirm a low incidence of freemartinism from heterosexual twin pregnancies in Ripollesa sheep.
Keywords: Ripollesa breed, freemartin, sheep

© 2018 The Korean Society of Veterinary Science.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.