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Breeding / Calving Issues
Bull with translocation gene, semen testing questions
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<blockquote data-quote="inyati13" data-source="post: 1041299" data-attributes="member: 17767"><p>djinwa, what stikes me is that the information you provided and the discussion in this thread are related to a specifically identified translocation (1;29 Robersonian translocation). To expand the scope of the discussion, all bulls have the potential to carry known and <strong>unknown</strong> translocations. Which means to you, that there is not <strong>zero</strong> risk even if you select a different bull. Take it one further step, if it is a new translocation (and the potential for new translocations are infinite as they are defined by where on the chromosome the break occurs) then no one would even have a test for it unless they had a comprehensive genetic map of the bull/genetic fingerprint. I looked at the chapter in my genetics book,"Principles of Genetics" by Eldon J. Gardner, 1968. Outdated, but the principles of translocation seem to be the same. But in the decision you are making, you could also factor in that all semen has the potential, albeit small especially if the bull has a track record and it has not showed up, to exist. Translocations according to my understanding from glancing through my text, can even occur during the process of spermatogenesis. Thus, a bull that is clean today could be collected tomorrow and send out semen that harbors the genetic defect. I just add this disclaimer, I only briefly reviewed the chapter. You are correct to consult one of the semen companies. If you do, please come back to this thread and provide your findings. I would like to know about the incidence of bad semen in an otherwise non-defective bull. Thank you. I have appreciation for a topic like this.</p></blockquote><p></p>
[QUOTE="inyati13, post: 1041299, member: 17767"] djinwa, what stikes me is that the information you provided and the discussion in this thread are related to a specifically identified translocation (1;29 Robersonian translocation). To expand the scope of the discussion, all bulls have the potential to carry known and [b]unknown[/b] translocations. Which means to you, that there is not [b]zero[/b] risk even if you select a different bull. Take it one further step, if it is a new translocation (and the potential for new translocations are infinite as they are defined by where on the chromosome the break occurs) then no one would even have a test for it unless they had a comprehensive genetic map of the bull/genetic fingerprint. I looked at the chapter in my genetics book,"Principles of Genetics" by Eldon J. Gardner, 1968. Outdated, but the principles of translocation seem to be the same. But in the decision you are making, you could also factor in that all semen has the potential, albeit small especially if the bull has a track record and it has not showed up, to exist. Translocations according to my understanding from glancing through my text, can even occur during the process of spermatogenesis. Thus, a bull that is clean today could be collected tomorrow and send out semen that harbors the genetic defect. I just add this disclaimer, I only briefly reviewed the chapter. You are correct to consult one of the semen companies. If you do, please come back to this thread and provide your findings. I would like to know about the incidence of bad semen in an otherwise non-defective bull. Thank you. I have appreciation for a topic like this. [/QUOTE]
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