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1 Holland Genetics, PO Box 5073, 6802 EB Arnhem, The Netherlands
2 Dutch Cattle Syndicate, PO Box 454, 6800 AL Arnhem, The Netherlands
The semen of 20 mature, evaluated bulls was split-sample diluted and contained 2.1 x 106 to 17.3 x 106 total spermatozoa per 0.25-ml French straw. The number of viable inseminated spermatozoa ranged from 1.1 x 106 to 11.8 x 106. Each bull had 2430 to 5330 first or second inseminations performed. The nonreturn rate at 56 d after AI was estimated for every dilution. The daily nonreturn rates to 180 d were used to estimate conception and calving rates at a given concentration. The relationship was determined between these estimations and the number of spermatozoa that were actually inseminated.
The bulls differed significantly in their maximal nonreturn rate at high sperm numbers per AI and in the rate at which they approached this maximum. There was no correlation between the maximum nonreturn at high sperm numbers and the rate of approach, which implies that the ranking of the bulls for nonreturn rate 56 d after AI changes with the number of spermatozoa inseminated.
Multiphasic analysis of reproductive efficiency revealed bull differences in estimated conception and calving rates. The estimated calving rate after conception was 82 to 90% and was independent of the number of spermatozoa that were inseminated. The sperm numbers needed to obtain 95% of the maximal conception rate ranged from 1 x 106 to 11 x 106.
Key Words: fertility • nonreturn rate • number of spermatozoa
Submitted on March 31, 1997
Accepted on February 3, 1998
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