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A new herd addition such as breeding stock, can introduce many infectious disease agents. These organisms could cause congenital malformations, abortions, respiratory disease and/or diarrhea. In addition, diseases with prolonged incubation times can be introduced to the herd with healthy animals. Semen and embryos are also of concern for spread of infectious disease organisms. Diseases like bovine viral diarrhea (BVD) and porcine reproductive respiratory syndrome (PRRS) can be introduced with semen if not tested thoroughly and properly.
To introduce new animals to herd without increasing risk of disease, consider: