Atresia Coli - Atresia Ani

Atresia Coli Inherited in Holstein Cattle

A mating pIan was designed to test the genetic hypothesis that atresia coli is inherited as an autosomal recessive at a single locus with two alleles. Matings between 8 putative carrier sires and 56 putative carrier dams resulted in 59 normal and 8 atresia coli calves, which was not different from the expected number of 8.1 affected calves. One case of atresia coli was observed among 628 calves born concurrently in the herd. All of the affected calves born from planned and contemporary matings were inbred.

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