Tryptophan metabolism and related B vitamins in the multiparous sow fed ad libitum after farrowing.

Although dietary content of tryptophan has been related to variations of feed intake in lactating sows, the mechanisms remain to be elucidated. Twenty multiparous crossbred Landrace × Large White sows were used to assess variations of tryptophan metabolism around farrowing. Sows were fed 3 kg/d of a standard gestation diet from insemination until farrowing.