The acknowledgements of the PGGRC in these slides is very poor.  The majority of the funding that has given us the 4 methane options that are profiled has come through PGGRC of which DairyNZ is a main partner. I think that the horse may have bolted on this but would request that any future presentations are corrected to show the role that Industry support has played. 
The 4-6 % quoted for breeding lacks context - we have seen that  difference develop in the single trait selection lines bred for methane reduction only, but the difference we believe might be obtainable in the commercial world  is around 1% reduction per generation but its permanent and cumulative and therefore will add up to something substantial over time. 