standardized ileal digestible lysine requirement of male turkey poults to 49 day of olds

the aim of the present study was to determine the appropriate standardized ileal digestible lysine requirement to 49 day of olds in male but,6 turkey poults. experiment 1 and 2 were used  from 8-28 and 28-49 d-old respectively. one hundred sixty male but,6 turkeys in each experiment were used in a completely randomized design with eight treatments (8 levels of standardized ileal digestible lysine in 4 replicates of 5 birds in each. standardized ileal digestible lysine level of basal diets in experiment1 and 2 were 1.33 and 1.15% respectively. different levels of lysine (0.075, 0.15, 0.225, 0.3, 0.375, 0.45, 0.525%) were added to basal diets. in experiment 1, by using of broken line- linear ascending, quadratic polynomial and  broken line- quadratic ascending standardized ileal digestible lysine requirements for weight gain were 1.56±0.05, 1.67 and 1.65±0.1 and for fcr were 1.58±0.05, 1.75 and 1.74±0.1% respectively. in experiment 2, by using of broken line - linear ascending, quadratic polynomial and  broken line- quadratic ascending standardized ileal digestible lysine requirements for weight gain were 1.47±0.11, 1.57 and 1.49±0.05 and for fcr were 1.57±0.17, 1.61 and 1.59±0.08% respectively. in conclusion, standardized ileal digestible lysine requirements in starter  for body weight gain and fcr ranged between 1.56 to 1.67 and 1.58 to 1.75 % respectively. in experiment2, standardized ileal digestible lysine requirements for body weight gain  ranged between 1.47 to 1.57 and for fcr between 1.57 to 1.61%.