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Effects of the trypsin inhibitor concentration in pig fattening diets on performance, health and carcass parameters

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Protease inhibitors form complexes with trypsin and chymotrypsin, leading to a lower protein digestibility. However, pig tolerance for moderate dietary levels needs more assessment. Raw soybeans of three varieties (Baya, Isidor and Ecudor) differing in trypsin inhibitor content were substituted to extruded soybeans on a weight basis, to compare increasing concentrations of trypsin inhibitors in fattening diets averaging 0.8, 1.4, 2.1, 3.2 and 3.4 trypsin inhibitor units (TIU)/mg in Exp.1, and 0.8, 1.7, 2.1, 2.6, 4.4 and 5.3 TIU/mg in Exp.2. A total of 310 (LWxLd)xPP pigs (29.4 ±2.5 kg) were fed ad libitum up to 2.65 kg/d for females and 2.85 kg/d for barrows. No diarrhoea was observed and individual faecal scoring was similar among treatments. However, pen scoring showed a tendency for higher consistency in droppings with the 0.8 TIU diet at d 23 (P=0.08) and 30 (P=0.11) in Exp.1. During the growing period, feed intake was unaffected by treatments in Exp.1 but was decreased by 4.4 and 5.3 TIU diets in Exp.2 (P=0.03). Pigs offered 3.2 and 3.4 TIU/mg in Exp.1 had a decrease in daily gain by 11 and 13%, respectively (P=0.04), and an 8% increase in feed/gain (P<0.001). Similarly, 4.4 and 5.3 TIU diets affected daily gain (-15% and -9%, P=0.01) and feed/gain (+6% and +5%, P=0.02) in Exp.2. Nevertheless, performances were not significantly modified during the finishing period of both Exp.1 and Exp.2. Therefore, fattening pigs should not received more than 3.0 TIU/mg, although some compensatory mechanisms may occur over a length of time.

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