Abstract
The success of the swine production is directly related to efficiency in reproductive performance matrices, reflected in the number of piglets produced/female/year. This increase in productivity is a result of the genetic improvement they have suffered in recent years. Simultaneously, had to adjust the nutritional needs of these matrices to support the growth of the fetus and mammary gland during mainly the final third of pregnancy, with emphasis on the needs of protein/amino acids and energy. However, the feeding programs for gestation females are based on a single diet formulation, with adjustments to the power level, making it easier to apply, however not meeting the requirements of energy and protein matrices, resulting in performance below their genetic potential. Therefore, we suggest feeding programs in two phases (0-70 days and 70 days to farrowing) for pregnant gilts with the purpose of improving fetal growth, mammary system and maternal protein gain without excessive fat gain.
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