Table 3.

Growth performance, apparent ileal digestibility (%), total tract utilization (%) of DM, gross energy (GE), and nitrogen (N) and energy values in experimental diets containing increasing concentration of copra meal (CM) and cornstarch fed to broiler chickens.¹

Item	Experiment 12						Experiment 23
	RD	CM, g/kg		SEM	P-value4		RD	Cornstarch, g/kg		SEM	P-value4
		100	200		L	Q		100	200		L	Q
Initial BW, g	441	441	441	0.2	-	-	541	543	543	1.2	-	-
Final BW, g	739	741	727	6.1	0.201	0.331	874	843	790	5.2	<0.001	0.122
BW gain, g/bird	297	305	286	5.3	0.144	0.066	334	300	248	4.8	<0.001	0.132
Feed intake, g/bird	396	393	389	6.2	0.406	0.928	459	445	402	4.5	<0.001	0.018
G:F, g/kg	754	785	740	13.0	0.468	0.030	727	675	616	8.1	<0.001	0.785
Ileal digestibility
DM	70.2	67.1	62.6	0.47	<0.001	0.209	70.5	74.8	75.8	0.32	<0.001	0.001
Gross energy	71.3	68.5	65.3	0.69	<0.001	0.828	72.8	76.6	77.7	0.36	<0.001	0.007
IDE5, kcal/kg DM	3,282	3,194	3,102	32.2	0.001	0.958	3,345	3,479	3,485	16.4	<0.001	0.007
Total tract utilization
DM	72.7	71.6	71.0	1.08	0.300	0.860	74.8	76.3	78.7	0.34	<0.001	0.236
Gross energy	75.5	74.6	74.1	1.02	0.353	0.868	78.5	79.5	81.5	0.33	<0.001	0.309
Nitrogen	64.9	67.6	66.4	1.71	0.546	0.360	69.4	70.0	72.4	0.76	0.015	0.332
ME, kcal/kg DM	3,472	3,476	3,517	48.1	0.512	0.752	3,605	3,610	3,656	15.1	0.032	0.283
MEn, kcal/kg DM	3,290	3,280	3,337	43.9	0.459	0.546	3,401	3,427	3,485	13.7	<0.001	0.337

¹In both experiments 1 and 2, each least squares mean represents 8 observations.

²Birds were fed experimental diets for 5 d from day 15 to 19 after hatching.

³Birds were fed experimental diets for 5 d from day 16 to 20 after hatching.

⁴L = linear effect of test ingredient; Q = quadratic effect of test ingredient.

⁵IDE = ileal digestible energy.