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The
concentration of spermatozoa should range from 30-800 million/ml. Second
ejaculates collected 1 hour after the first will have a concentration of
about 50 % of the first.
The total number of spermatozoa per ejaculate vary with
the season of the year. The highest total occurs in July and lowest total in
January. For example, the first ejaculate may contain an average of 22
billion spermatozoa in July and 10 billion in January. This means that early
in the breeding season a stallion's total spermatozoal output may be about
50 % of his maximum capable spermatozoal output.
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