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<blockquote data-quote="randiliana" data-source="post: 503967" data-attributes="member: 2308"><p>The horn gene has nothing to do with color.</p><p></p><p>There are 2 different genes that can give you horns. The one in Bos taurus cattle, it is recessive to the gene for polledness. And works the same way in males AND females</p><p>PP - Homo polled</p><p>Pp - Hetero polled (carries the horn gene)</p><p>pp - Homo horned (animal is horned)</p><p></p><p>The one in Bos indicus (brahman and zebu cattle) is called the African horned gene. It is sex linked, in that it only takes one copy for a bull to have horns, and 2 copies for the cow to have horns.</p><p></p><p>In males </p><p>AfAf = homo horned (animal has horns)</p><p>AfAn = hetero horned (animal has horns)</p><p>AnAn = Homo polled (no horns)</p><p></p><p>In females</p><p>AfAf = Homo horned (animal has horns)</p><p>AfAn = Hetero polled (animal is polled but carries the horn gene)</p><p>AnAn = Homo polled (no horns)</p><p></p><p>Simply put, a cow has to be homo to have horns. If you have a horned cow (with the Af gene) then EVERY male calf she has will have horns. However, depending on what she is bred to some, all or none of her heifer calves will have horns. </p><p></p><p>Also, cattle can carry both kinds of horn gene. They can also carry the scur gene, which is also sex linked in the same way the Af gene is. Sc is dominant in males and recessive in females.</p><p></p><p>So essentially you COULD have an animal that is AfAf, pp and ScSc, homo for all 3 horn types.</p></blockquote><p></p>
[QUOTE="randiliana, post: 503967, member: 2308"] The horn gene has nothing to do with color. There are 2 different genes that can give you horns. The one in Bos taurus cattle, it is recessive to the gene for polledness. And works the same way in males AND females PP - Homo polled Pp - Hetero polled (carries the horn gene) pp - Homo horned (animal is horned) The one in Bos indicus (brahman and zebu cattle) is called the African horned gene. It is sex linked, in that it only takes one copy for a bull to have horns, and 2 copies for the cow to have horns. In males AfAf = homo horned (animal has horns) AfAn = hetero horned (animal has horns) AnAn = Homo polled (no horns) In females AfAf = Homo horned (animal has horns) AfAn = Hetero polled (animal is polled but carries the horn gene) AnAn = Homo polled (no horns) Simply put, a cow has to be homo to have horns. If you have a horned cow (with the Af gene) then EVERY male calf she has will have horns. However, depending on what she is bred to some, all or none of her heifer calves will have horns. Also, cattle can carry both kinds of horn gene. They can also carry the scur gene, which is also sex linked in the same way the Af gene is. Sc is dominant in males and recessive in females. So essentially you COULD have an animal that is AfAf, pp and ScSc, homo for all 3 horn types. [/QUOTE]
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