The Development of an Amino Acid Reference Diet for the Early Growth of Chicks

Chick bioassay of Lysine

“…There was no difference between this diet and the control diet in maize-sesame meal diet. A similar pattern was observed when the Dean and Scott (1962) standards are compared with the control diet, although in this case, an increase of 20 per cent and 30 per cent in the amino acid levels resulted in such diets supporting the same rate of growth as the control diet. It was concluded from this experiment that the best performance obtained from the 20 per cent protein diet with o-8 per cent supplementary lysine, was indicative of greater adequacy and better balance of dietary factors in this diet, than in those where amino acid balance was sought in terms of the two standards used.…”

“…A balance of dietary amino acids was sought in terms of recognised requirement standards, or simple multiples of these. Two such standards (National Research Council, i960; Dean and Scott, 1962) were chosen and experimental diets were prepared so that the amino acid 253 diet (no. 8) was designed to test the effect of adding an amino acid mixture simulating the composition of the basal diet proteins to an Research Council (i960) standards can be seen in the response of chicks to those diets in which an improvement in amino acid balance was sought by increasing the levels of the amino acids by 20 per cent.…”

“…NRC = National Research Council (i960) amino acid requirements for poultry Dean and Scott = Dean, W. F. and Scott, H. M. (1962). amino acid requirements for poultry.…”

Influence of Dietary Protein Level and Amino Acid Composition on Chick Performance

“…Diets in series B were formulated in a manner similar to those in A, except that part of the monosodium glutamate at each protein level was replaced by nine essential amino acids. The criteria for amino acid supplementation were those levels reported by Dean and Scott (1962). The protein content of the diets in series C was adjusted upward by conventional means; i.e., replacing corn with soybean meal.…”

Effects of starter diet supplementation with arginine on broiler production performance and on small intestine morphometry

“…The increase in the Arg:Lys ratio in the starter phase afforded a increased production performance.. At 1,25% digestible dietary lysine as is now common for young broiler chicks and if a lysine:arginine ratio 1.00:1.05 is to be maintained, as suggested by ideal protein (Dean & Scott 1965, Baker 1994, Rostagno et al 2005) then the Arg level needs to be 1.31%. However, according to Marumatsu et al (1991), the Arg use efϐiciency of birds falls linearly with the increase in the Lys level.…”