Influence of dietary tryptophan concentration on performance and dietary selection by starting pigs

摘要

Tryptophan (Trp) may be a growth limiting factor in pigs especially when diets are mainly based on corn products. Given that requirement derivations from different studies show a high variability, a dose response trial was conducted to estimate the starting pigs Trp requirement. Besides effects on growth, Trp is considered to be involved in feed intake regulation. A former study (Ettle and Roth, 2004) demonstrated that piglets prefer diets adequate in Trp over Trp deficient diets. In the second experiment of the present study, those effects of Trp on dietary selection were proven using a broader range of Trp concentrations of diets on offer.