Twelve bulls carrying the 1/29 chromosome translocation were compared with 45 chromosomally normal bulls concerning sexual functions, semen characteristics, and fertility. All bulls were unselected from the point of view of fertility. Sexual functions such as libido and serving ability were found to be quite normal in bulls carrying the 1/29 chromosome translocation. The semen analysis indicated small reductions in the concentration of semen and in the total number of spermatozoa but the volume of the ejaculate as well as qualitative characteristics of the semen such as wave motion and motility appeared normal. The fertility was reduced and the non-return rates to service at 28 and 56 days pointed to a reduction of 5 and 7%, respectively, expressed as percentage of the mean rates of the association.
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Dyrendahl et al. (2009) studied this question.
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