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Artificial Insemination (AI) for Cattle
S Summit 4604 or S Chisum 255
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<blockquote data-quote="Bcompton53" data-source="post: 1615131" data-attributes="member: 38094"><p>either of those would probably be fine. Your mature weights are going to be pretty low, so you may want to keep that in mind. Breeding heifers from ultra low mature weight bulls has its own set of concerns. A 2400 pound clean up bull can injure yearling heifers, as well as calving concerns, should you try a bull with larger birthweights. </p><p></p><p>Having looked at the two, I personally would use chisum 255. Reasons being, higher accuracies on many of the EPDs. Accuracies below about a .5 are more or less worthless. I've spent a lot of time looking back at historic bull directories, and it is crazy how a bull can go from mature weights of top 5% with an accuracy of .32, to 4 years later mature weights of bottom 10% with accuracy of .86. It happens all the time. So often I will look at the bulls lineage and see what his parents suggest he might do, based on their higher accuracies. </p><p>Anyway, as a whole, I like chisums set of numbers marginally better than summit. I will grant that chisum's father's epds and his own both suggest cattle that are tall for their weight. In other words, If you look at a bull such as capitalist 028, he is toward the lower percentiles for mature height, but top 50ish percentile for mature weight. whereas chisum 255 and his father both have ultra low mature weights, and moderately low mature heights. Now...in the grand scheme of things, maybe you won't see a lot of difference, but....it is something to note. example, we have a couple jersey angus cross calves that grow leggy with no body capacity. Chisum 255 is the last bull I would ever want to use on genetics like that.</p><p>That being said, try some of them both! that's the beauty of AI breeding, and a couple years from now give us a report!</p></blockquote><p></p>
[QUOTE="Bcompton53, post: 1615131, member: 38094"] either of those would probably be fine. Your mature weights are going to be pretty low, so you may want to keep that in mind. Breeding heifers from ultra low mature weight bulls has its own set of concerns. A 2400 pound clean up bull can injure yearling heifers, as well as calving concerns, should you try a bull with larger birthweights. Having looked at the two, I personally would use chisum 255. Reasons being, higher accuracies on many of the EPDs. Accuracies below about a .5 are more or less worthless. I've spent a lot of time looking back at historic bull directories, and it is crazy how a bull can go from mature weights of top 5% with an accuracy of .32, to 4 years later mature weights of bottom 10% with accuracy of .86. It happens all the time. So often I will look at the bulls lineage and see what his parents suggest he might do, based on their higher accuracies. Anyway, as a whole, I like chisums set of numbers marginally better than summit. I will grant that chisum's father's epds and his own both suggest cattle that are tall for their weight. In other words, If you look at a bull such as capitalist 028, he is toward the lower percentiles for mature height, but top 50ish percentile for mature weight. whereas chisum 255 and his father both have ultra low mature weights, and moderately low mature heights. Now...in the grand scheme of things, maybe you won't see a lot of difference, but....it is something to note. example, we have a couple jersey angus cross calves that grow leggy with no body capacity. Chisum 255 is the last bull I would ever want to use on genetics like that. That being said, try some of them both! that's the beauty of AI breeding, and a couple years from now give us a report! [/QUOTE]
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