AGRICULTURE

In short horn cattle, when a red bull (RR) mates with a white cow (rr) the offspring are roan?

(intermingled red and white hairs). Could a rancher establish a herd of roan cattle that only produce roan offspring?

Red Bull RRx White cow rr

R R
r Rr Rr
r Rr Rr

All of the offspring from the F1 generation would be Heterozygous Rr creating a roan cow. If the rancher continued to use the same parents RRxrr all of the offspring would be roan Rr.

However if the rancher later decides to use roan offspring to creat another cross the offspring would be 25 % red 50% roan and 25% white or a 1:2:1 ratio

R r

R RR Rr

r Rr rr

1 Red RR
2 Roan Rr
1 White rr

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