Milk production from diets of silage and dried forage. 3. Effect of formalin-treated ryegrass silage of high digestibility givenad libitumwith and without urea

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Abstract
1. Young adult and adult lactating British Friesian female cattle (heifers and cows) were individually fedad libitumon perennial ryegrass silage (F) made with an additive of formic acid (3·41 of 85% acid/t fresh grass) or on a silage (FF) made from the same crop with an additive of 9·01/t of a mixture of equal volumes of formic acid and formalin (35% w/w solution of formaldehyde). Silage F was supplemented with a concentrate containing 50% dried grass and 50% barley at a low (L) or high (H) level of feeding; silage FF was supplemented with the same concentrate at the lower level only, either with urea at 2·0% of the silage DM (FFLU) or without urea (FFL).2. Silage F had a lower pH (P< 0·001) and contained more lactic, acetic and total fermentation acids (P>in vivoof the diet was lower (by up to 3 units) for treatment FFL than for the other treatments (PPPP<0·05).4. Milk yields did not differ significantly between treatments and metabolic blood profiles were normal.

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