Finally, to produce an optimal Feed Conversion Efficiency (FCE) for cows and maximise returns, it is vital to combine good rumen function with good nutrition. This report supports the idea that to realistically achieve this goal, dairy farmers should utilise their pastures as a high quality forage base. If and when there is a necessity to supplement the feed ration with higher levels of starch and/or forages, the alternative aforementioned processes could also be undertaken.