THE SPECIFIC GRAVITY OF BULL SPERMATOZOA FROM DIFFERENT PARTS OF THE REPRODUCTIVE TRACT
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There are a few reports on the changes in specific gravity (s.g.) during maturation and ageing of spermatozoa. Lindahl & Kihlström (1952) found the s.g. of bull spermatozoa to range between 1·240 and 1·334. The s.g. decreased from 1·2867 to 1·2668 when three consecutive ejaculates were collected. Lindahl & Thunqvist (1965) found a value of 1·10 to 1·12 for the s.g. of bull epididymal spermatozoa and a value of 1·21 to 1·33 for ejaculated spermatozoa. Assuming that spermatozoa from the epididymis and from later ejaculates are younger than those from the first ejaculates, they suggested that the s.g. of spermatozoa increases with maturation and ageing.
Spermatozoa were taken from different parts of the bull testis in order to ascertain whether their s.g.
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