Analysis of conception rate, nonreturn rate (NRR), and juvenile mortality. (A) Conception rate of first artificial inseminations (1st AI) of 2900 bulls with nulliparous females, conventional semen, expressed as SD from the mean to allow comparison between bulls from different breeds. Arrowheads indicate carriers of the following IRs: red for reciprocal translocations, yellow for insertional translocation, gray for reciprocal with derivative loss, and green for Robertsonian translocation. (B) NRR for five affected Holstein bulls (i.e., the proportion of females that were not reinseminated after an insemination with the semen of the bull in question) and mean NRR of 2152 Holstein bulls. Two extreme bulls, Qu and Ma, are highlighted in red and yellow. (C) Mortality rates over the first year of life among the daughters of 2854 bulls considered, expressed as the SD from the mean of their respective breeds (same color code as in vignette A). (D) Distribution of mortality rates at 1 yr of age for Nt's progeny (n below bars). (*) Fisher comparison with wild-type group P < 0.05, (**) P < 0.01.
