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Cattle Boards
Breeding / Calving Issues
open cows may be bull's fault
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<blockquote data-quote="cow pollinater" data-source="post: 1343224" data-attributes="member: 14661"><p>If you cull for age at around ten years old, which is fairly common and has little to do with fertility, that means you need around 10% replacement just to cover replacing aged cows. You still have to replace the cows that leave for disposition problems, health problems, calving problems, cows that were sold in downsizing during drought, etc. </p><p>You are making the assumption that all failures are due to infertility and that is simply not the case. Even if it were the case, infertility is usually about 90% management/environment and only about 10% genetic.</p><p>As far as scrotal circumference, it really has little to do with the bulls fertility and only slightly more to do with daughter fertility. Take Limousins, for example. Small testicles were one of the big knocks on the breed for a long time but I've heard first hand from someone that oversees the collection of literally hundreds of bulls of all different breeds that they consistently produce the highest quality semen and can produce it in volumes that most other bulls can't.</p></blockquote><p></p>
[QUOTE="cow pollinater, post: 1343224, member: 14661"] If you cull for age at around ten years old, which is fairly common and has little to do with fertility, that means you need around 10% replacement just to cover replacing aged cows. You still have to replace the cows that leave for disposition problems, health problems, calving problems, cows that were sold in downsizing during drought, etc. You are making the assumption that all failures are due to infertility and that is simply not the case. Even if it were the case, infertility is usually about 90% management/environment and only about 10% genetic. As far as scrotal circumference, it really has little to do with the bulls fertility and only slightly more to do with daughter fertility. Take Limousins, for example. Small testicles were one of the big knocks on the breed for a long time but I've heard first hand from someone that oversees the collection of literally hundreds of bulls of all different breeds that they consistently produce the highest quality semen and can produce it in volumes that most other bulls can't. [/QUOTE]
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Breeding / Calving Issues
open cows may be bull's fault
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