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Breeding / Calving Issues
Breeding bull to daughters
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<blockquote data-quote="Mark Reynolds" data-source="post: 1823209" data-attributes="member: 43196"><p>I'm wondering why someone would breed back just to 'test' their cattle, unless they are focusing on breeding stock rather than market animals. I'm going to throw a wrench into this discussion. Mor to see what the reaction is more than anything else. One must remember that recessive genes are not always bad, and can often be good. One must also remember the benefits of hybrid vigor when you cross totally unrelated animals to produce a superior animal resulting from a dis-proportionate number of heterozygous gene pairs. Here is something else to think about. There are 'recessive' genes that give a positive phenotypic response when present in a heterozygous pair that tend to be lethal in homozygote pairs. It's not cattle, but is a prime example. The gene for sickle-cell anemia is recessive. It is also lethal in a homozygous pair. However, in heterozygotes, the recessive gene is beneficial in that it keeps the posessor healthier. How you ask? The recessive gene protects the heterozygote individual from malaria. That is why there is a disproportinate presence of this gene in the population than would be expected for a recessive gene that is lethal in homozygous pairs. In other words, heterozygous individuals with this lethal gene are more desirable than any homozygote without it......they are healthier.</p></blockquote><p></p>
[QUOTE="Mark Reynolds, post: 1823209, member: 43196"] I'm wondering why someone would breed back just to 'test' their cattle, unless they are focusing on breeding stock rather than market animals. I'm going to throw a wrench into this discussion. Mor to see what the reaction is more than anything else. One must remember that recessive genes are not always bad, and can often be good. One must also remember the benefits of hybrid vigor when you cross totally unrelated animals to produce a superior animal resulting from a dis-proportionate number of heterozygous gene pairs. Here is something else to think about. There are 'recessive' genes that give a positive phenotypic response when present in a heterozygous pair that tend to be lethal in homozygote pairs. It's not cattle, but is a prime example. The gene for sickle-cell anemia is recessive. It is also lethal in a homozygous pair. However, in heterozygotes, the recessive gene is beneficial in that it keeps the posessor healthier. How you ask? The recessive gene protects the heterozygote individual from malaria. That is why there is a disproportinate presence of this gene in the population than would be expected for a recessive gene that is lethal in homozygous pairs. In other words, heterozygous individuals with this lethal gene are more desirable than any homozygote without it......they are healthier. [/QUOTE]
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