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Published online by Cambridge University Press: 21 November 2017
Treatment of straw with sodium hydroxide or ammonia to improve its nutritive value to ruminants is now well established. However, these chemicals are corrosive and not ideal for use on farms. Urea has been proposed in recent years as an ammonia precursor for the treatment of straw. Urea is a safe (non-corrosive) chemical to handle in both the solid and aqueous form, and could be applied to straw by the farmer himself without the need for specialized contractors. The aim of the work reported was to determine whether urea is an effective alternative to ammonia for the treatment of straw.
In two preliminary trials treated straws were evaluated by determining digestibility in vitro (Tilley and Terry 1963). The first trial showed that for optimum improvement in digestibility, at least 70g urea/kg straw dry matter (DM), and a moisture content of approximately 500g/kg, were required.
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