Apparent faecal digestibility of dry matter, organic matter, ash, crude protein, starch and energy were higher for the starch diets than for the fat diets. The digestibility of fat was lower for the starch based diets. Overall, it can be concluded that an increase in contents of dietary energy and essential amino acids (Lys, Met, Thr, Trp, Val and Ile) increases growth performance and energy intake more in LSC than in HSC pigs. Compared with studies in which only EAA were supplemented and not energy to increase performance of immune challenged pigs, it seems that dietary supplementation of both EAA and energy is more effective in increasing performance of LSC pigs than dietary supplementation of EAA alone. This suggests opportunities to at least partly compensate for the reduction in growth performance in pigs kept under low sanitary conditions and/or sub-optimal health condition by modification of the energy and EAA composition of the diet. Partly replacing dietary starch with fat does not seem an interesting approach to increase the performance of the LSC GF pigs.
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