Assertion: tryptophan | /r/HasProperty | 1.3 g/kg
Facets:
Source sentences:
text: These authors verified that production and egg mass were negatively affected during six weeks, when laying hens received diets with low levels of tryptophan (1.3 g/kg), and that the performance was recovered after a week receiving feed containing tryptophan at 2.1 g/kg.