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Effect of Transportation upon Fertility of Dairy Bulls

American Foundation for the Study of Genetics, Madison, Wisconsin

ABSTRACT

Data concerning fertility and some semen characteristics of 36 bulls before and after moving from one stud to another have been compiled.

The average 60- to 90-day nonreturn rate from first services performed the day following collection of semen for a 3-month period prior to moving was 66.8%. That for a 2- to 4-week period following moving was 69.2% and for the next month was 68.4%. These differences are not significant. The average volume of semen per ejaculate prior to moving was 5.5 ml. and for the two periods following moving was 6.1 and 6.3 ml., respectively. This increase in volume after moving is highly significant (P < 0.01). The average number of spermatozoa per milliliter of semen during these three periods was 1,549, 1,406, and 1,466 million, respectively. These differences are not significant. The total number of spermatozoa per ejaculate varied little from one period to another, being 8,599, 8,590, and 9,189 million, respectively. These differences also are not significant. These data indicate that the fertility of bulls was not impaired by transportation.