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As compared to control diets (maize-soybean oil-meal), the utilization of peas (winter variety Frisaon) as only protein supplement led in both trials to a marked decline in the performance of the animals, especially during the growing period (— 15 p. 100 for feed intake and -40 p. 100 for weight gain). Addition of tryptophan allowed to restore almost totally the level of feed intake and considerably improved the growth rate and feed efficiency. Thus, in trial 2 with diets (maize-peas) rebalanced with tryptophan during the whole growing period, performances were only 6 p. 100 lower than those of the control group (non significant difference). In the same way, the combination of peas and PX, without soybean oil-meal led to performances equivalent to those obtained with maize-peas diets supplemented with tryptophan over the whole period (28-100 kg) and even identical to those of the control group during the finishing period. Results of both trials clearly indicate the role of tryptophan as first limiting factor in diets containing a high proportion of peas and point out the possibilities of using several protein sources of metropolitan origin to totally replace soybean in growing pig diets.

Total replacement of soybean oil-meal in growing pig diets : Use of peas supplemented with tryptophan or combined with a lucerne protein concentrate