Effect of grass nitrogen protection by Acacia cyanophylla on nitrogen balance and sheep milk production

TL;DRAbstract

Tunisian dairy sheep is localized in sub humid area characterized by a high forage production and prairie growing. Nevertheless, young grass is characterized by a high level of soluble nitrogen which generates an important loss of urinary nitrogen leading to environment pollution. The objective of this work is to study the natural protection of protein by acacia tannins and its effect on urinary losses and milk production. An experimental sheep flock conducted on ray-grass grazing was divided into three homogeneous groups according to lactation rank. The first group (Control, C) received 300 g of concentrate, the second group (C-A) 300 g of concentrate and 100 g acacia, the last group only 100 g acacia (A). The nitrogen balance was realized on individual boxes with a daily cut herb. The dairy control was twice a month. Total milk production was higher for C-A group than for other groups, 48, 45 and 42 l for C-A, C and A respectively. Nitrogen intake varied significantly according to th

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