SUPPLÉMENTATION PAR LA L-LYSINE D'UN RÉGIME VÉGÉTAL SIMPLIFIÉ CHEZ LE PORC EN CROISSANCE

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Abstract
In a diet for growing pigs after weaning, fishmeal (Norwegian herringmeal) was significantly better than groundnut meal, supplying the same amount of protein, as a supplement to barley. The superiority was shown in growth rate, feed per unit weight gained and efficiency of utilization of protein, both in animals from 20 to 60 kg and for the whole experiment from 20 to 100 kg. Body composition on the other hand, was not changed when groundnut meal replaced fishmeal. A supplement of 0. 2 p. 100 L-lysine hydrochloride to a mixture of barley and groundnut meal in diets for pigs from 20 to 60 kg gave a significant improvement in the characteristics studied. Performance of the pigs given the supplemented diet was equal to that on a diet of barley and herringmeal. A supplement of 0. 4 p. 100 L-lysine HC1 to the same diet did not give as good results, but there was no significant difference in performance of the pigs given the different amounts of L-lysine. From 60 kg, a supplement of 0. 15 p. 100 lysine (or more) did not give any significant improvement in growth. The carcassesof the pigs given the supplements had a significantly higher proportion of lean in ham and loin than in controls. Nitrogen balance estimated in castrated male pigs confirmed in foregoing results: retention of nitrogen increased when the diet of barley and groundnut was supplemented with lysine HC1.