Groups of rainbow trout (Salmo gairdneri; mean weight 5 g) were given diets containing 10, 12, 14, 17, 21, 24 and 26 g lysine/kg diet for 12 weeks. By analysis of the growth values the dietary requirement of lysine in this experiment was found to be 19 g/kg diet. A similar requirement value was obtained from a dose-response curve of expired 14CO2 (following an intraperitoneal injection of L-[U-...

a, e-Diaminopimelic acid was first isolated from acid hydrolyzates of Corynebacterium diphtheriae by Work (1951). Subsequent studies by Dewey and Work (1952) and by Davis (1952) have demonstrated that a, e-diaminopimelic acid (DAP) can be decarboxylated to lysine and that the path of lysine synthesis apparently involves DAP as an intermediate. Davis (1952) reported that a mutant strain of Esche...

Background: Lysine requirements of well-nourished children from developing regions have been found to be similar to those of children from developed regions (33.5 mg kg d). However, intestinal parasites have been shown to increase lysine requirements in undernourished adults, and it is not known if a similar phenomenon occurs in undernourished children from poor and unsanitary environments. Obj...

There have been relatively few lysine requirement studies that have covered the full productive life of commercial toms (0 to 20 wk). Lysine is the reference amino acid for Ideal Protein ratios and accurately defining the requirement reduces fractional errors in the corresponding ideal protein ratios. A series of studies were conduct to determine the lysine concentrations (total and digestible)...