Effect of Sire, and Semen Collection Year and Season on Cuban Siboney Herd Bulls Semen Discharge Quality
Abstract
Sire, year, and season effects on Cuban Siboney herd bulls semen discharge were studied. To this end, data on monthly semen production comprising seven uninterrupted years (1993-1999) were sampled out of 642 registers from the Artificial Insemination Provincial Center, in Camagüey, Cuba. All indexes ranged within the normal values for this species. The Fisher test revealed significant sire and year effects on volume, density, and spermatozoa number (millions/mL) as well as a relevant year influence on motility; however, no significant impacts upon indexes were detected in relation to season. A multivariant analysis including the canonical variable semen quality (volume, motility, density, and spermatozoa number) as a dependent variable of sire, year, and season parameters was performed. Multivariant tests validated sire (P<0,001), year (P<0,001) and season (P<0,05) effects. Every correlation between semen quality and each studied index proved to be significant, mainly concerning sire (r=0,609) which showed the highest value. Each variable load distribution according to the resulting effects evidenced the possible role played by sire age in semen quality. Studies of this kind including a higher number of sires and genotypes and evaluating age effect are recommended.
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References
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