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

Table 1

Ingredients of experimental diets (g·kg⁻¹ dry matter).

	Run 1		Run 2		Run 3
Ingredient	Ref^†	Test diet 1	Ref^†	Test diet 2	Ref^†	Test diet 3
Test ingredients 1^‡	—	298.5	—	—	—	—
Test ingredient 2^⁋	—	—	—	298.5	—	—
Test ingredients 3^§	—	—	—	—	—	298.5
Casein	400	280	400	280	400	280
Gelatin	40	28	40	28	40	28
Cellulose^1	132	92.4	132	92.4	101.2	70.8
Dextrin	90	63	90	63	90	63
Pregelatinized corn starch^2	107.4	75.2	107.4	75.2	107.4	75.2
Fish oil	150	105	150	105	150	105
Canola oil	49	34.3	49	34.3	49	34.3
L-Arginine^3	1.9	1.3	1.9	1.3	1.9	1.3
Monocalcium phosphate	15.5	10.9	15.5	10.9	15.5	10.9
Sodium carbonate	—	—	—	—	30.8	21.6
Choline chloride 98%	1	0.7	1	0.7	1	0.7
Vitamin C 35%	0.2	0.14	0.2	0.14	0.2	0.14
Vitamin premix^4	5	3.5	5	3.5	5	3.5
Mineral premix^4	3	2.1	3	2.1	3	2.1
TiO2	5	5	5	5	5	5
Total	1,000	1,000	1,000	1,000	1,000	1,000

^†Ref, casein-based semisynthetic laboratory standard diet; ^‡regular feather meal (RegFeM), GOLDMEHL® feather meal (GoldFeM), Iranian feather meal (IRFeM), poultry by-product meal with minimun 64% crude protein (PBM_64) and canola meal (CM) were tested; ^⁋its test ingredient was Iranian feather meal but the diet was 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); and ^§poultry by-product meal with the maximum 11% ash content as low-ash (PBM_LA), poultry by-product meal with minimum 50% crude protein (PBM_50), poultry protein concentrate (PPCon), poultry ultra-flash dried blood meal (BM), and Iranian soybean meal (IRSBM) were tested. ¹Provided by Mikro-Technik GmbH & Co. KG, Bürgstadt am Main, Germany; ²provided by Kröner-Stärke GmbH, Ibbenbüren, Germany; ³provided by Evonik Nutrition and Care GmbH, Hanau-Wolfgang, Germany; and ⁴Vitamin and mineral requirements of fish were met. Provided by Trouw Nutrition Deutschland GmbH, Burgheim, Germany.