Table 1.

Experimental design.¹

Treatment		CP, %	AFD Thr-to-Lys ratio, %	AFD (Gly + Ser)-to-Lys ratio, %
T1	PC	20.5	64	156
T2	NC	18.5	55	135
T3	as T2 + 0.03 l-Thr	18.5	58	135
T4	as T2 + 0.06 l-Thr	18.5	61	135
T5	as T2 + 0.09 l-Thr	18.5	64	135
T6	as T2 + 0.07 Gly	18.5	55	142
T7	as T6 + 0.03 l-Thr	18.5	58	142
T8	as T6 + 0.06 l-Thr	18.5	61	142
T9	as T6 + 0.09 l-Thr	18.5	64	142
T10	as T2 + 0.14 Gly	18.5	55	149
T11	as T10 + 0.03 l-Thr	18.5	58	149
T12	as T10 + 0.06 l-Thr	18.5	61	149
T13	as T10 + 0.09 l-Thr	18.5	64	149
T14	as T2 + 0.21 Gly	18.5	55	156
T15	as T14 + 0.03 l-Thr	18.5	58	156
T16	as T14 + 0.06 l-Thr	18.5	61	156
T17	as T14 + 0.09 l-Thr	18.5	64	156

CP = crude protein; AFD = apparent faecal digestible; PC = positive control; NC = negative control.

¹Experimental diets were fed from 7 to 28 d. l-Thr and Gly provided by Ajinomoto Animal Nutrition Europe.