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Influence of Sperm Number on Fertility of Frozen Bovine Semen¹

Department of Animal Industries, University of Connecticut, Storrs

ABSTRACT

Eighty-three ejaculates from ten Holstein bulls were split and 40% extended to 20 x 10⁶ and 60% extended to 30 x 10⁶ progressively motile spermatozoa per milliliter (dose) before freezing and storage in liquid nitrogen (LN). The 60- to 90-day per cent nonreturn rate (NR) was 71.7 from 5,607 first-service inseminations for 20 million concentration and 72.2% NR from 5,638 first services for 30 million. A weighted mean difference of 0.17% NR in favor of the 30 million was not statistically significant (P > 0.05).

Measurements were made which included motility, per cent survival, sperm number, and cooling time and correlated with per cent NR on a within treatment split-ejaculate basis. No correlation was of sufficient magnitude to be of value in predicting fertility.

¹ Scientific contribution No. 94, Agricultural Experiment Station, University of Connecticut, Storrs. This investigation was supported in part by grants-in-aid from the Chas. H. Hood Dairy Foundation, National Association of Artificial Breeders and Northeastern Council of Artificial Breeding Cooperatives.

² Storrs Agricultural Experiment Station Biometrician.