Effect of dietary concentrations of energy, crude protein, lysine, and methionine on the performance of White Leghorn layers in the tropics.

摘要

Three experiments were conducted using White Leghorn layers (Babcock) from 21 to 72 wk of age to evaluate the effect of dietary ME (2,350 and 2,600 kcal/kg) and CP (15, 16.5, and 18%; experiment 1), and supplementation of low-CP diets with graded concentrations (0.65, 0.70, 0.75, and 0.80%) of lysine (experiment 2) or methionine (0.305, 0.335, 0.355, and 0.395%; experiment 3) on layer performance. Each diet was fed ad libitum to 8 replicate groups housed in an open-sided poultry house (22.0 to 35.5 degrees C). Dietary concentrations of CP had no effect (P