Progeny testing for bovine syndactyly

Syndactylous donors, superovulation, embryo transfer, and fetal removal via cesarean section were used to test four Holstein-Friesian bulls suspected of being heterozygous for syndactyly. Two bulls produced syndactylous fetuses, and thus were proved heterozygous. The other two bulls each sired eight normal fetuses and were assumed to be homozygous normal.