Response to superovulation was expressed as number of ova and number of transferable embryos per flush. Red Danish and Danish Red & White had significantly higher values than Danish Jersey and Danish Friesian. Higher heritability (0.25 ±0.06) was found when response was expressed as number of ova, but number of transferable embryos was also heritable ( h2=0.15 ±0.05). It is argued that systematic use of superovulation in cattle breeding programs might increase ovarian sensitivity to gonadotropins and hence increase twinning frequency in non-superovulated cows.

T. Liboriussen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 234–236, 1994
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