Dr. Damien Barrett:

I would not say it is in all cattle. There are differences insofar as whether that come across it are more genetically susceptible or resistant to it. Coming up to breeding season this year, farmers received text messages advising them, when choosing bulls for the breeding season, to choose bulls with greater resistance. The Deputy has correctly pointed out that there will not be a vaccine on the horizon in the short term. In the absence of a vaccine, what is available in the short-term is breeding for resistance. This is essentially genetic resistance, rather than vaccine resistance.