The genetic fight against PRRS
Porcine reproductive and respiratory syndrome (PRRS), caused by Betaarterivirus suid 1, was first observed in the U.S. in 1987 and had spread to Europe by 1990. Pigs that contract what was at first called “the mystery pig disease” are frequently left with an inability to conceive, see an increase in late term abortions, premature farrowing and
