الفهرس 
Motility of spermatozoaOnly 14 pages are availabe for public view
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Abstract
This work was carried out at Sakha Animal Experimental Station, Animal Production Research I n s t i t u t e , Ministry of Agriculture during the period from October 1981 to July 1982. This study aimed to investigate the effect of frequency of ejaculation and season on the semen physical and chemical characteristics i n Friesian bulls . Fifteen sexually mature Friesian bulls 22 months age on average body weight of 450 kg were used. The t o t a l number of bulls were alloted to three similar groups according to t h e i r l i v e weight each of five bulls: group I: Two successive ejaculate within few minutes interval were collected . group 11: Four succetisive ejaculateswithin few minutes interval were collected . group 111: More than four successive ejaculate werecollected u n t i l a bull did not mount with 15 midha.