MYF6 and hydrops fetalis: In addition, SNP hits in the AMPD1, CAPN3, MYF6 and SDR16C6 CGs were monomorphic only to the Polish Red breed, while a SNP hit in the GDP10 CG was monomorphic only to the Polish HF breed, and SNP hits in the GHRHR and IGFN1 CGs were monomorphic only to the Hereford breed.