EFFET DE LA TENEUR EN ARGININE DU RÉGIME SUR LA CROISSANCE ET LE BILAN AZOTÉ CHEZ LE LAPIN : RELATION AVEC LE TAUX DE LYSINE

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Abstract
Recent data indicated that the arginine requirement of the rabbit (0.9-1.0%) is higher than that of the rat or pig (0.2%). In all these studies, the lysine level of the experimental diets was high (1.1%). The possibility that rabbits have a lysine-arginine antagonism comparable to that evidenced in the chicken was studied. Sixty-six 5 wk old rabbits were given 6 treatments of a factorial design including 3 arginine levels (0.63, 0.78 and 0.93%) and 2 lysine levels (0.71 and 1.50%). The apparent digestibility and metabolic utilization of protein were measured in 42 of these animals. For the 2 lysine levels, addition of arginine improved growth, feed efficiency, N balance and the N retention coefficient, with the highest values being obtained with 0.93% arginine. With diets supplying 0.78 or 0.93% arginine, the values obtained were higher with 1.50 than with 0.71% lysine. The requirement for arginine in the rabbit is apparently about 0.9-1.0% of the diet; it was not overestimated previously because of a lysine-arginine antagonism. A lysine level of 1.50% exerted no depressive effect on rabbit performances.

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