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A total of 20 sexually mature bucks representing the Gabali ( GA ), Rex ( R ), Californian ( C ) and New Zealand White (NZW ) rabbit breeds ( N = 3, 2, 4 and 11, respectively) and aged 9 or 12 months. They were used to study the effect of buck on some semen quality parameters and protein patterns of its seminal plasma under Egyptian conditions. The obtained results, after adjusting data for bucks age differences, indicated that semen quality characteristics of rabbit bucks represented by the reaction time (second), volume of semen per ejaculate without gel fractions (ml), sperm-cell concentration/ejaculate/ml, percentage of sperm abnormalities, percentage of dead spermatozoa, percentage of advanced (progressive) sperm motility, mass motility grade, total sperm output, semen colour grade and semen density grade, beside the semen pH, were not significantly different among breeds. However, age showed only a significant (P<0.05) effect on the volume of the fresh ejaculate. The 4 rabbit breeds shared 2 common seminal plasma protein bands at molecular weights of 326 and 252 KDa. These 2 bands (i.e. B1 and B2) could be used as specific protein markers to characterize these 4 breeds of rabbits. Correlation values showed that both B6, B14 and may be B3 seminal plasma protein bands at molecular weights of 40, 6 and 112 KDa, respectively, can be used as specific seminal plasma protein markers to select rabbit bucks with good semen quality. From this study, it can be concluded that SDS-PAGE of the seminal plasma protein is a sensitive method for studying the genetic structure of the population of rabbits and can be used in the selection of bucks having good semen quality. Under Egyptian conditions, semen quality of NZW bucks seems to be of lower er than those displayed by bucks of the other two imported breeds.

SEMEN QUALITY CHARACTERISTICS AND PLASMA SEMINAL PROTEIN PATTERNS OF DIFFERENT EGYPTIAN RABBIT BUCKS