01781naa a2200325 a 450000100080000000500110000800800410001902400550006010000190011524501010013426000090023552008290024465000160107365000190108965000250110865000120113365000240114565000180116965300360118765300360122365300150125970000220127470000180129670000190131470000150133370000180134870000180136670000160138477300550140021334332021-08-10       2020    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1590/1984-3143-AR2020-02172DOI1 aFACIOLI, F. L.  aA rare case of heteropaternal twin calves after natural mating in Brazil.h[electronic resource]  c2020  aAbstract: Twin birth is a complex condition observed in most livestock animals, when the female gives birth to two or more offspring, generally out of the same mating. In cattle, it is a rare condition (3 to 5%) and depends on the genetic background and environmental factors. Twin birth is a result of multiple ovulations, being more common in dairy rather than in beef cattle. Calves could be monozygous or dizygous, with the same or of different sexes. When twins are born with different sexes, a sexual condition called Freemartinism occurs in between 90 to 97% of pregnancies, causing infertility in the female calf. Knowing that the twin rate is rare in commercial beef cattle, here we present an even rarer case of twin birth from two different sires after natural mating, also called heteropaternal superfecundation.  aBeef cattle  aNatural mating  aAcasalamento Natural  aBezerro  aFecundação Animal  aGado de Corte  aHeteropaternal superfecundation  aSuperfecundação heteropaterna  aTwin birth1 aBEZUTTI, G. da F.1 aBENDER, R. S.1 aMARQUES, M. G.1 aBONDAN, C.1 aZANELLA, E. L1 aBERTOLINI, M.1 aZANELLA, R.  tAnimal Reproductiongv. 17, n. 4, e20200217, 2020.