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Relationship between semen characteristics of young and adult bulls in the Normande breed


, : Relationship between semen characteristics of young and adult bulls in the Normande breed. Livestock Production Science 35(3-4): 265-281

Semen production and semen quality of Normande bulls in performance test station and in two AI centers were studied. In station data from 2677 bulls between 12 and 15 months of age, exhibited large differences between 5 groups corresponding to an overall classification given by a technician. Correlations between variables corrected for environmental factors showed a high relationship between all measures of semen quality and number of doses per ejaculate. In the AI centers, trimestral (for the first year) or annual means (for years 2 and 3) of 387 bulls were calculated from monthly means and were analyzed with a mixed model, treating the bull effect as random. Best linear unbiased predictions of the bull effect considering the two periods separately were strongly correlated (0.57 to 0.79). Correlations between corrected data collected in station and bull effect estimates in AI studs were quite high for volume and concentration, and moderate for motility and number of doses per ejaculate or per month. The correlations calculated are underestimates of the true ones, as bulls with undersirable semen characteristics were culled before entering AI. Nevertheless, among the remaining bulls, important differences (40%) in semen output were observed between extreme groups, as classified by the technician.

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Accession: 002477972

DOI: 10.1016/0301-6226(93)90097-2

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