Abstract
Recent work has reported that synchronising the hourly supply of energy and nitrogen to the rumen can improve the efficiency of microbial growth by 12-14% (Sinclair et al., 1995). However, animals when offered an asynchronous feed ad-libitum may alter their pattern of intake to achieve a more synchronous release of nutrients in die rumen. In addition, the provision of concentrates at fixed times may alter the hourly and daily intake of forage and the pattern of release of nutrients in the rumen. In a previous experiment with growing sheep (Sinclair and McQuiston 1995), grass silage was demonstrated to have an asynchronous release of energy and nitrogen in the rumen and mat the provision of concentrates did not alter the pattern of silage intake but increased the degree of synchrony.
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