140 



The Biochemistry of Semen 



of citric acid by some of the accesory organs and the male sex 

 hormone activity. 



600 



Pellet implanted 



Pellet removed 



2 3 4 5 6 7 8 

 Weeks after castration 

 Fig. 12. Post-castrate fall and testosterone-induced rise of seminal fructose 

 in rabbit; pellet: 100 mg. testosterone. 



(Mann & Parsons, 1947) 



{a) Time relationship between the onset of secretory activity in male 

 accessory glands and spermatogenesis. In young rabbits (Davies and 

 Mann, 1941 b), rats (Mann, Lutwak-Mann and Price, 1948), bull- 

 calves (Mann, Davies and Humphrey, 1949) and boars (Mann, 1954), 



