Table 4. Estimated standardized ileal digestible lysine requirements and recommendations for White Pekin ducks from hatch to 21 days of age based on linear-plateau and quadratic-plateau regression analysis

Item	Requirement (%)¹⁾	SE	R²	p-value	Recommendation (%)²⁾
Final BW (g)
LP	1.00	0.060	0.90	< 0.001	1.05
QP	1.11	0.176	0.84	0.008	1.05
ADG (g/bird/day)
LP	1.00	0.061	0.90	< 0.001	1.05
QP	1.11	0.181	0.84	0.009	1.05
FCR (g/g)
LP	0.98	0.029	0.97	< 0.001	1.04
QP	1.10	0.097	0.95	0.002	1.04

Standardized ileal digestible lysine requirement based on regression analysis.
Standardized ileal digestible lysine recommendation for each parameter based on both regression analyses.
BW, body weight; LP, linear-plateau regression analysis; QP, Quadratic-plateau regression analysis; ADG, average daily gain; FCR, feed conversion ratio.