Determination of ileal digestible and apparent metabolizable energy contents of expeller-extracted and solvent-extracted canola meals for broiler chickens by the regression method

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Table 5 Dry matter (DM), energy, and nitrogen (N) digestibility and total tract retention of broilers fed the experimental diets containing expeller-extracted canola meal (EECM) or solvent extracted canola meal (SECM) levels at 0, 100, 200 g/kg

Item	0	EECM		SECM		SEM	P value
Item	0	100	200	100	200	SEM	L^a	Q^a	L^b	Q^b
Ileal DM digestibility (%)	72.1	66.9	67.1	71.3	67.9	0.598	<0.001	0.002	<0.001	0.086
Total tract DM retention (% of DM intake)	66.9	64.9	62.2	66.3	60.4	1.623	0.057	0.852	0.012	0.200
Ileal N digestibility (%)	82.9	80.8	82.3	82.3	80.5	0.701	0.530	0.046	0.028	0.499
Total tract N retention (% of N intake)	55.8	57.0	54.0	56.6	50.3	2.828	0.655	0.550	0.191	0.325
Total tract N retention (mg/g of DM intake)	22.2	22.7	21.5	22.5	20.0	1.126	0.656	0.550	0.191	0.325
Ileal energy digestibility (%)	76.0	72.1	72.1	75.7	73.1	0.520	<0.001	0.007	0.001	0.087
Total tract energy retention (% energy intake)	73.7	72.1	70.1	73.2	68.3	1.227	0.052	0.933	0.007	0.164
IDE (kcal/kg of DM)	3485	3358	3399	3498	3399	24	0.024	0.013	0.024	0.078
AME (kcal/kg of DM)	3379	3355	3304	3382	3178	57	0.362	0.846	0.024	0.156
AME_n (kcal/kg of DM)	3196	3168	3127	3198	3013	49	0.332	0.914	0.018	0.141

SEM standard error of the mean, IDE ileal digestible energy, AME apparent metabolizable energy, AME _n nitrogen-corrected AME
^aLinear (L) and quadratic (Q) contrasts for the EECM
^bLinear (L) and quadratic (Q) contrasts for the SECM