Table 2.

Dietary protein, NE and SID EAA requirements of growing pigs^a

Item	Body weight range, kg
	7-20	20-50	50-80	80-110
Crude protein, %	18	15	13	12
NE contentb, kcal/kg	2450	2360	2360	2400
Amino acids, standardized ileal digestible basis, %
Lysine	1.30	1.01	0.86	0.75
Threonine	0.84	0.65	0.54	0.49
Tryptophan	0.26	0.18	0.15	0.13
Methionine + Cysteine	0.75	0.58	0.50	0.43
Valine	0.78	0.63	0.56	0.51
Ratio of SID AA to SID lysine
Threonine/Lysine	0.65	0.64	0.63	0.65
Tryptophan/Lysine	0.20	0.18	0.17	0.17
(Methionine+ Cysteine)/Lysine	0.58	0.57	0.58	0.57
Valine/Lysine	0.60	0.62	0.65	0.68

^aThe recommended requirements summarized from the academic dissertation of our research group determined in China [118, 124–129]

^bThe NE values of feed gradients are estimated based on Noblet’s equations [115]