Which breed is associated with the genetic defect PHA?

Which breed is associated with the genetic defect PHA?

• A. Angus
• B. Maine-Anjou
• C. Hereford
• D. Charolais

Answer: (B)

PHA is a lethal congenital defect in calves caused by a recessive gene. In the Maine-Anjou breed, this defect has been identified and tracked, leading breeders to test and avoid mating two carriers. Affected calves typically have underdeveloped lungs (pulmonary hypoplasia) and widespread fluid buildup (anasarca) and die soon after birth. Carriers look normal, which is why genetic testing and careful mating plans are important. The other breeds listed aren’t associated with this defect in the same way, so the Maine-Anjou breed is the one linked to PHA.

PHA is a lethal congenital defect in calves caused by a recessive gene. In the Maine-Anjou breed, this defect has been identified and tracked, leading breeders to test and avoid mating two carriers. Affected calves typically have underdeveloped lungs (pulmonary hypoplasia) and widespread fluid buildup (anasarca) and die soon after birth. Carriers look normal, which is why genetic testing and careful mating plans are important. The other breeds listed aren’t associated with this defect in the same way, so the Maine-Anjou breed is the one linked to PHA.