Frequencies of the derived 32E allele in different ear-sized outbred pig populations.

a European domestic pigs include Iberian (n = 10), Berkshire (n = 4), Large Black (n = 2), Mid White (n = 2), Chester White (n = 2), Old Spot (n = 2), Yorkshire (n = 2), Tamworth (n = 1), British Lop (n = 1), Hampshire (n = 1), Saddle Back (n = 1). All these animals are homozygous GG except a heterozygote detected in one of two Large Black pigs, which exhibits large or medium-size and floppy ears and are influenced by Chinese breeds brought into England in the late 1800's (Kijas et al. 1998) [22].