Veterinary Andrology and Reproductive Techniques

ANTIBIOTICS

• Many of the organisms present in the semen are non-pathogenic.
• The organisms which are contagious and spread through the semen are Brucella abortus, Vibrio fetus, Trichomonos fetus, Leptospira pomona, Mycobacterium tuberculosis, Mycobacterium paratuberculosis and viral agents like Infectious Bovine Rhinotracheitis and FMD.
• Refrigeration greatly suppresses the multiplication of organisms but does not necessarily stop it.
• Some of the organisms like Pseudomonos aeroginosa, Trichomonas fetus, Leptospira pomona, FMD and IBR-IPV survive after freezing also.
• Penicillin and Streptomycin are two antibiotics widely used since 1950 and are still in use. They are relatively harmless to sperm cells and inhibits broad spectrum microorganisms.
• Penicillin G – 500-1000 IU/ml and Dihydrostreptomycin 500-1000 µg/ml is adequate for routine use.
• Antibiotics will not completely eleminate Brucella abortus, Trichomonos fetus, Mycobacterium tuberculosis, Mycobacterium paratuberculosis, viral agents like Infectious Bovine Rhinotracheitis and Foot and Mouth virus and Rickettsiae and Fungi.

The addition of antibiotic is not an extra precaution and cannot be taken as effective tool to permit use of semen from infected bulls or unhygienic proceedings.

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