Arginine Requirements and Optimum Balance between Dietary Arginine and Lysine in Broiler Chicks

UENO Keisuke, ISHIBASHI Teru

doi:10.2508/chikusan.69.760

The reported arginine (Arg) requirements range widely by investigators, and Arg requirements are affected by dietary lysine (Lys) levels. Therefore, this experiment was conducted to ascertain the interrelationship between Arg requirements and dietary Lys levels using body weight gain and plasma concentration (PC) of Arg as parameters. Female broiler chicks at 8 days of age were divided into 20 dietary groups of 10 chicks, housed individually, and given free access to the experimental diets for 10 days. The Arg- and Lys-deficient basal diets were consisted of corn, corn gluten meal, soybean meal and wheat bran, and contained 0.65% Arg, 0.80% Lys, 18.7% crude protein and 3.20 kcal metabolizable energy (ME)/g of diet. To the basal diet, four graded levels of Lys were added, and to each Lys diet, graded five levels of Arg were added. The body weight (BW) gain of chicks increased with increasing dietary Arg levels and then decreased in all dietary Lys levels. The PC of Arg increased slowly and then linearly with increasing dietary Arg levels. The Arg requirements (Y, % of diet) determined from BW gain and PC of Arg increased linearly with increasing dietary Lys levels (X, % of diet, 0.80_??_X_??_1.40 for BW gain and 0.80_??_X_??_1.70 for PC of Arg) as follows. Y=1.15X-0.21(r²=0.944)for BW gain, and Y=1.10 X-0.21 (r²=0.991) for PC of Arg. When BW gain was plotted against dietary levels of Lys and Arg, the maximum BW gain was achieved at 1.10% Lys and 1.36% Arg and the ratio of Arg/Lys was estimated to be 1.24.

Arginine Requirements and Optimum Balance between Dietary Arginine and Lysine in Broiler Chicks

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