In order to evaluate diets with high nutritional density, with or without industrial amino acid supplementation, adjusted at net energy base, it was used 80 pluriparous lactating sows with the same genetic pattern, distributed in an experimental block design composed of four diets, 20 blocks, considering each sow an experimental unity. The criteria used for formation of the blocks were the weight and parity order. Diets were formulated by the combination of four levels of crude protein (18.33; 15.23; 19.63; or 16.59%), four levels of metabolizable energy (3,344; 3,293; 3,480; and 3,440 kcal/kg), two of digestible lysine (0.85 and 0.95%) and two levels of net energy (2,519 and 2,636 kcal of NE/kg) and the supplementation with industrial amino acids up to the digestible triptofano:lysine relationship of 18%. There was no effect of the diets with high nutritional density, with or without amino acid supplementation, on the average daily intake of the ration. The diets did not influence weight, loss and changes on weight, the internal weaning-to-estrus interval neither the estimate of milk production of the sows during lactation period. Diets of high nutritional density (lisyne and energy) for lactating sows are efficient in reducing mobilization of body reserves and they do not affect productive and reproductive performance of the sows.
energy; estrus; oil; piglets; temperature; weight
