Freemartinism in replacement ewe-lambs of the Ripollesa sheep breed

Pilar Marí, Joaquim Casellas

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1 Citation (Scopus)


© 2018 The Korean Society of Veterinary Science. 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.
Original languageEnglish
Pages (from-to)858-861
JournalJournal of Veterinary Science
Publication statusPublished - 1 Nov 2018


  • Freemartin
  • Ripollesa breed
  • Sheep


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