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Released list of carrier bulls of Curly Calf Syndrome
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<blockquote data-quote="Brandonm22" data-source="post: 594196" data-attributes="member: 7645"><p>Well, we don't know for certain what the genetics is on this. I still think that there is a yet to be identified environmental trigger that sets the gene off. IF this is a simple recessive and you used a carrier like 1680 on your cows, only have of the resulting heifers would be AMCarriers. Half would be AMFree. If you came back on that herd with a Precision son who was also an AMCarrier (and half the Precisions sons would be AMFree) then the odds are you would only see 12.5% of the calf crop be AMSyndrome. In a 30 cow herd, that is 2-4 stills a year. I don't think that sets off too many alarm bells. Most people just would change their vaccination program, spray for toxic plants, buy their hay someplace else, or change the bull. If you only use that bull for 2 or 3 years, you probably never grasped what happened and blamed drought conditions or BVD type II or trich or moldy hay, some other environmental factor.</p><p></p><p></p><p>IF Angus won't let you register the AMCarrier calves beginning in 2010, I am really at a loss to see what there is to gain by using known carrier semen in a registered herd.</p></blockquote><p></p>
[QUOTE="Brandonm22, post: 594196, member: 7645"] Well, we don't know for certain what the genetics is on this. I still think that there is a yet to be identified environmental trigger that sets the gene off. IF this is a simple recessive and you used a carrier like 1680 on your cows, only have of the resulting heifers would be AMCarriers. Half would be AMFree. If you came back on that herd with a Precision son who was also an AMCarrier (and half the Precisions sons would be AMFree) then the odds are you would only see 12.5% of the calf crop be AMSyndrome. In a 30 cow herd, that is 2-4 stills a year. I don't think that sets off too many alarm bells. Most people just would change their vaccination program, spray for toxic plants, buy their hay someplace else, or change the bull. If you only use that bull for 2 or 3 years, you probably never grasped what happened and blamed drought conditions or BVD type II or trich or moldy hay, some other environmental factor. IF Angus won't let you register the AMCarrier calves beginning in 2010, I am really at a loss to see what there is to gain by using known carrier semen in a registered herd. [/QUOTE]
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Released list of carrier bulls of Curly Calf Syndrome
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