Aquaculture Nutrition

Research Article

Nutrient Digestibility and Retention of Potential Feed Ingredients for Rainbow Trout (Oncorhynchus mykiss W.) Aquaculture in Iran

Table 4

Chemical composition analysis in experimental diets^† (g·kg⁻¹ dry matter).


	Run 1						Run 2		Run 3
	Ref	FeM			PBM	CM	Ref	FeM	Ref	PBM		PPCon	BM	IRSBM
		RegFeM	GoldFeM	IRFeM	_64			IRFeM⁺		LA	_50

Dry matter	909	910	906	897	915	902	909	896	897	902	888	902	906	873
Gross energy (MJ/kg)	23.4	23.8	23.7	22.9	23.1	22.8	23.4	22.2	23.0	23.4	29.8	23.0	23.4	22.1
Crude protein	434	593	601	553	557	437	434	558	399	502	465	516	568	427
Crude lipid	174	154	144	127	173	175	174	128	183	176	149	169	124	138
Crude fiber	88	68	70	65	69	100	88	64	70	50	50	44	49	71
Crude ash	32	32	30	55	65	44	32	56	52	70	137	67	46	64
Total phosphate	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	6.8	10.4	21.8	7.7	6.4	6.7
Calcium	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	3.3	11	36.1	3.1	2.7	3.6
Nitrogen-free extract (NFE)^‡	272	153	155	200	136	244	272	194	296	202	202	204	213	300
TiO₂	5.4	5.6	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.3	5.3	5.3	5.3	5.4
Organic matter (OM)^⁋	968	968	970	945	935	956	968	944	948	930	863	933	954	936
NFE:OM (%)^§	28	16	16	21	15	26	28	21	31	22	23	22	22	32
pH	4.9	5.0	5.3	7.0	5.3	5.4	4.9	6.5	8.9	7.8	8.1	7.1	7.6	8.0

^†Ref, casein-based semisynthetic laboratory standard diet; FeM, feather meal; RegFeM, regular feather meal; GoldFeM, GOLDMEHL® feather meal; IRFeM, Iranian feather meal; PBM_64, poultry by-product meal with minimum 64% crude protein; CM, canola meal; IRFeM⁺, Iranian feather meal diet treated with citric acid (dissolved 0.02 g citric acid, C₆H₁₂O₆, per 1 g Iranian feather meal and sprayed on that diet or 0.6% diet); PBM_LA, low-ash (<11%) poultry by-product meal; PBM_50, poultry by-product meal with minimum 50% crude protein; PPCon, poultry protein concentrate; BM, ultra-flash dried poultry blood meal; and IRSBM, Iranian soybean meal. ^‡Calculated by subtracting crude protein, crude lipid, crude fiber, and crude ash from 1,000. ^⁋Calculated by subtracting the crude ash content from 1,000. ^§Calculated by dividing NFE by OM and multiplying 100. n.a., not analyzed.