This experiment aimed at validating the relationship between digestible amino acids with the digestible lysine proposed on the basis of the ideal protein concept. This experiment used 120 lactating sows distributed in a complete randomized block design with six treatments and 20 repetitions and one sow per experimental unity. The diets were formulated based on a reference diet - which contained 19.5% of crude protein (CP) and 0.95% of digestible lysine supplemented with digestible methionine, threonine, tryptophan and/or valine to meet the ideal protein based determined relationships with digestible lysine. The diets did not change weight loss and variation, thickness and thickness variation of backfat, protein and body protein variation, fat and body fat variation, neither they changed the weaning-estrus interval or milk production of the sows. The relationships between metionine + cistine, threonine, tryptophan, and valine digestible amino acids with digestible lysine based proposed on ideal protein meet the requirements of lactating sows for better reproductive and productive performances.
estrus; fat; piglets; protein; ration; weight
