الفهرس 
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Abstract
The material included in the present study was collected from two origins:-
• Farm material :- Blood samples were collected from 53 buffalo bulls ranging in age from 3-16 months from El-Hawatka farm and the Faculty of Agriculture during May 1980. Testosterone level was determined in these samples by Radioimmunoassay (RIA).
• Slaughterhouse material:-The genital organs and blood samples of 93 growing buffalo bulls were collected from Assiut abbatoir between April 1979 and March 1980. The weight of the genital organs was recorded. Fructose was determined in the seminal gland and ampulla. Serum testosterone level was assayed by RIA.
The obtained results are summarized as follows :-
• Serum testosterone level :-
1. Farm material :- the level testosterone was high in the younger age groups then decreased till the age of 8 months, where the level slightly increased again.
2. Slaughterhouse materials :- in the whole material, variation in the level of testosterone was observed in the different seasons with a relatively higher level during summer (2.83 mg/ml) and a lower level (2.08mg/ml) during autumn. There is no significant differences in testosterone level between different seasons of the year.
• Testis :-a maximum weight was reported in summer (91.7 g.), while a minimum value was a recorded in winter (77.57 g.). there is a significant difference (P/ 0.05) in testis weight between spring (12.77±0.44) and autumn (11.43±0.44). A highly significant difference ( P/ .0.01) was reported between spring and winter, (10.74±0.48) also a highly significant difference (P/0.01)was recorded between summer (13.97±0.65) and each of autumn and winter.