Table 6.

Effect of SID Leu, Val, and Ile content in low-protein diets on growth performance of male broiler from 28 to 42 D of age (experiment 3).¹

Treatment	SID amino acids (%)			Feed intake (g)	BW gain (g)	Gain:feed (g/g)2
	Leu	Val	Ile
1	1.43	0.97	0.86	2,500	1,447	580
2	1.43	0.97	0.56	2,477	1,385	560
3	1.43	0.67	0.86	2,482	1,345	541
4	1.43	0.67	0.56	2,387	1,157	485
5	1.13	0.97	0.86	2412	1,399	580
6	1.13	0.97	0.56	2,501	1,421	569
7	1.13	0.67	0.56	2,499	1,444	578
8	1.28	0.82	0.71	2,470	1,472	596
9	1.28	0.82	0.41	2,450	1,289	527
10	1.28	0.82	1.01	2,414	1,330	550
11	1.28	1.12	0.71	2,438	1,276	525
12	1.28	0.52	0.71	2,436	1,332	545
13	0.98	0.82	0.71	2,441	1,320	542
14	1.58	0.82	0.71	2,465	1,199	488
15	1.13	0.67	0.86	2,469	1,425	578
SEM				47.76	38.95	14.89
Response Surface				P-Value
Linear				0.97	0.01	0.001
Quadratic				0.85	0.001	0.001
Cross product (Leu x Val x Ile)				0.13	0.01	0.02
Total model				0.65	0.001	0.001

Abbreviation: SID, standardized ileal digestible.

¹Values are means of 5 replicate pens per treatment (treatments = 15; n = 75).

²Values corrected for mortality.