A review of the epidemiologic aspects of embryo transfer from Brucella abortus -infected cows

Available information on the epidemiologic aspects of embryo transfer from Brucella -infected cattle is reviewed to provide a knowledgeable perspective upon which the risk of transmission of this agent by the embryo can be assessed. Accumulated evidence indicates that exposure of preimplantation embryos to Brucella abortus in the uteri of superovulated, infected cows is unlikely. Further, it has been shown that embryo-washing procedures insure freedom from B. abortus even without antibiotics. The use of antibiotics with the proper cryoprotectant provides additional insurance that Brucella will not be transferred with frozen-thawed embryos. Four hundred fifteen (415) ova collected in 74 nonsurgical recoveries from Brucella -infected cows were culture-negative when examined for the presence of Brucella . After reviewing studies conducted on embryo transfer from Brucella abortus -infected cows, the authors conclude that B. abortus will not be transmitted when emphasis is placed on proper handling of embryos between collection from donors and transfer to recipients.