The Relationship Between Fertility and the Number of Spermatozoa Inseminated
R W Bratton, R H Foote, Charles R. Henderson
Journal of Dairy Science, Vol. 37, pp. 1353-1356, 1954
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Abstract
Three groups of approximately 4,100 first service dairy cows each were inseminated artificially with three different concentrations of motile spermatozoa, estimated to be 14.3 x 106, 9.5 x 106, and 4.7 x 106; the 60- to 90-day per cent nonreturns were 70.5, 70.9, and 66.7, respectively.