Here are some studies that talk about transmission of CAE during AI and breeding:
http://www.smallruminantresearch.com/article/S0921-4488%2812%2900354-9/abstract
http://www.theriojournal.com/article/S0093-691X%2811%2900662-5/abstract
http://www.sciencedirect.com/science/article/pii/S0093691X07006322
Bottom line is that you really shouldn't use a CAE+ buck or semen from a CAE+ buck.
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Thanks, I am anxious to read these! I never thought much about it since I hope I never have to worry about doing AI but it never hurts to learn in case or just to be able to help someone who may!