PMID: 9432146Feb 12, 1998Paper

Long-term trends in sperm counts of dairy bulls

Journal of Andrology
J L van OsL M Kaal Lansbergen

Abstract

A possible decline in sperm counts in men and its potential relation to exposure to environmental contaminants are subjects of a broad discussion. Whereas data for human research in this area are limited, records over prolonged periods on sperm counts in dairy bulls are amply available and provide useful information. Therefore, 75,238 ejaculates collected between 1977 and 1996 from 2,314 bulls at Noordwest, a center for artificial insemination (AI) in the Netherlands, were used to evaluate long-term trends in sperm output. Data were adjusted for known effects, of which age was the most important, followed by interval between semen collections, breed and season of collection. Mean sperm output per year of collection from 1978 through 1996 varied between 6.2 x 10(9) and 9.5 x 10(9) without any long-term decline. Mean sperm output per year of birth from 1970 through 1995 showed less variation, between 6.7 x 10(9) and 9.0 x 10(9), also without any long-term decline. Earlier published data of 22,120 ejaculates of 3,030 bulls of the same region, tested between 1962 and 1977, showed a corresponding sperm output, confirming the absence of any decline. The unaffected sperm output in bulls in the Netherlands during the last decades in sp...Continue Reading

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