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KMID : 0893420180190060858
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Journal of Veterinary Science
2018 Volume.19 No. 6 p.858 ~ p.861
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Freemartinism in replacement ewe-lambs of the Ripollesa sheep breed
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Mari Pilar
Casellas Joaquim
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Abstract
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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.
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KEYWORD
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Ripollesa breed, freemartin, sheep
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