Table 8.

Effect of SID Leu, Val, and Ile content in low-protein diets on growth performance of male broiler from 8 to 21 D of age (experiment 4).¹

SID amino acids (%)			Feed intake (g)	BW gain (g)	Gain:feed (g/g)2
Leu	Val	Ile
1.28	0.65	0.54	1,036	705	681b,c,d,e,f
1.28	0.65	0.79	1,070	719	671c,d,e,f
1.28	0.65	1.09	1,090	734	673b,c,d,e,f
1.28	0.90	0.54	1,070	750	702a,b,c,d
1.28	0.90	0.79	1,078	791	734a
1.28	0.90	1.09	1,085	772	712a,b,c
1.28	1.20	0.54	1,038	715	689a,b,c,d,e
1.28	1.20	0.79	1,058	693	656d,e,f
1.28	1.20	1.09	1,078	699	649e,f
1.83	0.65	0.54	1,037	661	647e,f
1.83	0.65	0.79	1,035	689	666c,d,e,f
1.83	0.65	1.09	991	656	663c,d,e,f
1.83	0.90	0.54	984	670	657d,e,f
1.83	0.90	0.79	1,079	768	713a,b,c
1.83	0.90	1.09	1,057	763	722a,b
1.83	1.20	0.54	1,038	661	638e,f
1.83	1.20	0.79	1,040	739	711a,b,c
1.83	1.20	1.09	1,074	760	708a,b,c
SEM			26.61	14.83	10.78
SID Leu levels (%)
1.28			1,067a	731a	685
1.83			1,037b	706b	681
SEM			8.87	4.94	3.59
SID Val levels (%)
0.65			1,043	695b	667b
0.90			1,059	748a	707a
1.20			1,054	711b	675b
SEM			10.86	6.05	4.40
SID Ile levels (%)
0.54			1,034	691b	669b
0.79			1,060	733a	692a
1.09			1,062	731a	688a
SEM			10.86	6.05	4.40
Effects			P-value
Leu			0.02	0.03	0.37
Val			0.57	0.01	0.001
Ile			0.12	0.001	0.02
Leu x Val			0.44	0.02	0.04
Leu x Ile			0.69	0.001	0.001
Val x Ile			0.63	0.04	0.12
Leu x Val x Ile			0.23	0.10	0.02

^a–fMeans in columns followed by different superscript letters are statistically different (P < 0.05).

Abbreviation: SID, standardized ileal digestible.

¹Values are means of 5 replicate cages per treatment (treatments = 18; n = 90).

²Values corrected for mortality.