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<blockquote data-quote="RD-Sam" data-source="post: 651185" data-attributes="member: 7927"><p>Since you have so many that are against line breeding at all, you can rule out the first 6 to 10 years of that 20. Many won't line breed at all in the first three generations, so at two years per generation minimum, plus however old the bull was before semen was used, there goes a bunch of years. Then you have hit and miss as to which animals became carriers or not. So you could have line bred for many generations and never had two carriers mated together, that could still be happening to this day with affected GAR lines in the pedigree multiple times. Some were just not as fortunate as others, and if it only happened a time or two to a ranch in 20 years, it would be dismissed.</p><p></p><p>I guess it comes down to the owners of these AI bulls to breed the bulls to their daughters and see what happens, but if the daughter is not a carrier, you will never see the problem, and if she is, you still have a 50/50 chance nothing will happen.</p><p></p><p>I can say that I am glad I know where my stock came from and know what the pedigree is, these unregistered animals or the lines created with no records are the real danger.</p></blockquote><p></p>
[QUOTE="RD-Sam, post: 651185, member: 7927"] Since you have so many that are against line breeding at all, you can rule out the first 6 to 10 years of that 20. Many won't line breed at all in the first three generations, so at two years per generation minimum, plus however old the bull was before semen was used, there goes a bunch of years. Then you have hit and miss as to which animals became carriers or not. So you could have line bred for many generations and never had two carriers mated together, that could still be happening to this day with affected GAR lines in the pedigree multiple times. Some were just not as fortunate as others, and if it only happened a time or two to a ranch in 20 years, it would be dismissed. I guess it comes down to the owners of these AI bulls to breed the bulls to their daughters and see what happens, but if the daughter is not a carrier, you will never see the problem, and if she is, you still have a 50/50 chance nothing will happen. I can say that I am glad I know where my stock came from and know what the pedigree is, these unregistered animals or the lines created with no records are the real danger. [/QUOTE]
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