الفهرس 
Development of male sex organsOnly 14 pages are availabe for public view
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Abstract
This investigation was carried out at Department of Animal Production >Faculty of Agriculture, Kafi El-Shed&, Tanta Uiivei-sity, and Mehallet Mousa Experimental Station, Auunal Production Research Institute, Ministry of Agriculture and to investigate the age of puberty of Egyptian buffalo males to maximizing the rate of genetic improvement in buffalo require intense and accurate selection of sire for future A.I. includmg concerning prepubertal and early post pubertal anatomical development of the reproductive organs histological appearance of testis, temporal pattern of testosterone associated with pubertal, sexual behavior development and post pubertal changes in semen
characteristics. Tlm-ty-nine buffalo bull calves (twenty-four born in winter season and fifteen born in summer season) were kept under investigation from 9 to 24 months of age. The average body weight for summer and winter born calves were 150.7 and 158.2 kg respectively, at the begtmuzg of the experimental work. A total of 28 calves (16 winter born and 12 summer born) were randomly assigned to be slaughtered at 9,12, 15, 18,2 1 and 24 months of age. This trail was extend for two years and the animals were fed accordmg to the live body weight as recommended by the Animal Production research Institute (1975). Starting from 9 month up to 24 months of age, change in sexual behavior of these animals were observed at weeldy intervals. Body weight, scrotal circumference and blood samples were taken biweekly from each bull calves .The reproductive tracts were removed after slaughtering. They were weighted and the dunension of - each part was measured and samples from testis for later histology analysis.