Unlocking the Power of
Poll Wagyu Genetics
The polled horned gene is viewed as a simple dominant, recessive inheritance. Each parent contributes one copy (allele) of the gene to the calf.
The two alleles are:
P = Poll
H = Horn
Every animal carries 2 copies of the gene.
The 3 possibilities are: PP, PH and HH.
Polled is dominant to horned. This means that whenever a polled gene is present, the animal does not have horns.
PP – Polled – this is called Homozygous Polled
PH – Polled – this is called Heterozygous Polled. Scurs are possible*
HH – Horned
*expect a higher incidence in males than females.
Scurs are small, loose horns or flat bone growth, which are only expressed in heterozygous polled animals.
Homozygous Poll
Homozygous polled animals will always give you polled, or scurred progeny. Even when crossed over horned animals.
When crossed over fullblood Wagyu, which are 100% horned (HH), 100%
of callves will be polled, or scurred.
When crossed over heterozygous polls, 50% of the progeny are homozygous polled, and 50% heterozygous.
When crossed over homozygous polls, 100% of the progeny are homozygous polled.
Heterozygous Poll
Heterozygous polled animals will give you a combination of polled, scurred and horned progeny depending on what they are crossed with.
When crossed over fullblood Wagyu, which are 100% horned (HH), 50% of the progeny will be polled, or scurred & 50% will be horned.
When crossed over heterozygous polls, 25% of the progeny are homozygous polled, 50% heterozygous, and 25% horned.
When crossed over homozygous polls, 50% of the progeny are homozygous polled and 50% heterozygous polled.
