Effects of processing whole soybeans in phase 2 diets of weaned piglets

The effects on piglets performances of diets containing soybeans that had been processed with roasting (Tostd), roasting followed by steam-flaking (To+), extrusion (Ext) were tested for 12 lots provided by 7 commercial suppliers A, B, C, D, E, F, G. In three trials piglets weaned at 28 days of age were fed with phase 2 experimental diets containing 56 % wheat, 20 % soybean meal, 15 % processed soybeans, vitamin-mineral premix and amino-acids, after receiving a common phase 1 diet.A total of 1091 piglets were assigned to treatments TostdA1, To+B1, ExtD1, ExtE1 in Trial 1, treatments TostdA2, To+B2, ExtD2, ExtE2 in Trial 2 and treatments TostdA3, To+C, ExtF, ExtG in Trial 3. Levels of trypsin inhibitors (TIU/mg substrate) were 3.0, 3.5, 3.5, 15.2 in Trial 1, 5.6, 3.2, 2.6, 10.2 in Trial 2 and 3.0, 4.2, 9.0, 5.6 in Trial 3.Performances were evaluated for the whole growing period with initial and final weight of 7.5 and 26 kg. The Average Daily Feed Intake was not influenced by treatment in the 3 trials. Average Daily Gain (g/d) for treatments were 469, 481, 476 and 468 in Trial 1, 463, 470, 466 and 436 in Trial 2 where ADG was decreased for piglets fed ExtE2 (p