MEASUREMENT OF SPERM MOTILITY 



47 



Table II. Mean velocity (v) of normally moving sperm cells from four 

 different bulls; no significant individual specificity 



Bull 



Standard Deviation 

 off 



(yum/sec) 



D 24 

 A 10 

 R 2 

 W 1 



This agrees well with an average figure of 94 microns/sec for 213 

 sperm cells reported by Gray (1955). No individual specificity in the 

 bulls was observed, as can be seen from Table II. 



Variation of v with Temperature. The temperature dependence of v 

 was measured for thirteen ejaculates of four bulls in the range 33-43 °C. 

 A fresh slide was made for each measurement. Figure 15 represents 



I i— 



CO 



80 



90 100 110 120 130 



MEAN VELOCITY, (v), Ll/SEC. 



Fig. 14. Variation in mean velocity v of twenty-four ejaculates from 

 four bulls. 



