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The Importance of Numbers of Spermatozoa in Relation to Semen Quality and Fertility of Dairy Bulls

Dairy Department, Louisiana State University, Baton Rouge

ABSTRACT

Studies were made to determine the relationships between spermatozoan concentration in ejaculated semen and fertility and between numbers of motile spermatozoa and fertility of 10 bulls in 1949 and in 1950–51. Also, a dilution experiment using 2, 6, and 12 million motile spermatozoa per milliliter was conducted. The various correlations and regressions are discussed.

From a review of the literature and the results of the studies reported herein the following conclusions appear to be justified:

1. Semen samples with a spermatozoan concentration as low as 500 million per milliliter will give as good fertility results as more concentrated ones, provided the semen is diluted on the basis of numbers of motile spermatozoa, 6 million motile spermatozoa or more per milliliter.

2. More uniform fertility results among and within bulls can be obtained when the semen is diluted on the basis of a constant number of motile spermatozoa.