Liffey Mills Dairy 18 ration. This is a high energy 18% coarse ration for medium to high yielding cows on silage or grass based diet. Over 40% of this ration is made from native cereals with the inclusion of pulps, beans and distillers grain to increase the flow through bins and augers. It is high in digestible fibre and so increased feeding rates in winter months can be easily achieved. This ration also contains standard vitamins, minerals and cal-mag.