Nutritional status and intake regulation in sheep. III. The relationship between improvement of nitrogen status and increase in voluntary intake of low-protein roughages by sheep

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Abstract
Relationships between the intake of feed by sheep fed on low-protein roughage and the improvement of the sheep's nitrogen status by duodenal supplementation are described. Results of experiments suggest that an increased protein intake initiated an improvement in dry matter and digestible energy intake which was related to improved nitrogen balance. An increased rate of passage of food through the alimentary tract did not alone account for greater intakes, since at a given rate of passage, the intake was higher when the sheep were in higher nitrogen balance; this suggested a higher level of 'fill' of the alimentary tract with improved nitrogen status. Data from other experiments where nitrogen supplements were given in the diet were examined similarly and similar conclusions were reached. The possible roles of protein absorbed by the sheep and of certain other nutritional factors are discussed in relation to possible mechanisms for regulating roughage intake by the sheep.