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It's simply not possible. When you breed a roan cow to a roan bull you only have a 50% chance of producing roan offspring, a 25% chance of producing white offspring and a 25% chance of producing red offspring. You have a much higher chance of producing a pure breeding red or white herd than a roan-coloured herd.

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Q: When roan color in cattle is the result of incomplete dominance between red and white color genes how would one produce a herd of pure breeding roan colored cattle?
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A red bull when crossed with white cows always produces roan-colored offspring explain how the colors for red roan and white are inherited?

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