الفهرس 
Introduction
Semen collectionOnly 14 pages are availabe for public view
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Abstract
The present study was carried out at Animal Production Research Station, El-Gemmizah, belonging to Animal Production Research Institute, Agricultural Research Center, in co-operation with Department of Animal Production, Faculty of Agriculture, Mansoura University, during the period from June to October, 2009. A total of twenty healthy Egyptian buffalo bulls with an average of 500 kg live weight and 2.5 - 4.0 years old was used to study the effect of selenium and vitamin E (Se+Vit. E), Se and zinc (Se+Z), Vit. E+Z and Se, Vit. E+Z) on sexual desire, testicular measurements, some physical semen characteristics and liver function of buffalo bulls. The experimental animals were divided into five similar groups (4 bulls each). Bulls in the 1st group were left without any treatment and served as a control group (G1). Bulls were injected intramuscularly with 10 mg Se as sodium selenite and oral dose (100 IU) of Vit. E as α-tocopherol acetate per head (G2); injected intramuscularly with 10 mg Se and oral dose (5 g) of zinc oxide per head (G3); oral dose (100 IU) of Vit. E plus 5 g zinc oxide per head (G4); or injected intramuscularly with 10 mg Se and oral dose (100 IU) of Vit. E plus 5 g zinc oxide per head (G5). All treatments were twice/week for five months. Throughout the experimental period, semen was collected from all treatments twice/week for two months as preliminary period and three as a main collection period. Results : Based on the foregoing results concerning sexual desire, testicular measurements, physical semen characteristics in fresh semen, sperm characteristics in frozen semen, enzymatic activity of transaminases and phosphatases in frozen semen and conception rate, buffalo bulls received an oral dose (100 IU) of vitamin E plus 5 g zinc oxide per head (G4) twice/week for five months resulted in the best results, reflecting beneficial effects of E+Z treatment on quality of fresh semen production and cryopreserved semen.