amikacin ( 0 , 50 , 100 , 250 , 500 , 1,000 2,500 , 5,000 and 10,000 microgram/ml ) and 1,000 iu of penicillin g plus 1,000 microgram of streptomycin/ml or 10,000 iu of penicillin g/ml were added to nine ejaculates of bull semen stored at 4 c in egg yolk-tris extender , and evaluated after 0 , 1 , 3 , 5 and 7 d .
C0030842
penicillin
C0030827
penicillin g