Aquaculture Nutrition

Research Article

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

Table 5

Apparent digestibility coefficients (ADCs) for crude protein (CP), crude lipid (CL), and organic matter (OM) and nutrient productive values in experimental diets and test ingredients in percent (means ± SD).

Run 1

Run 2

Run 3

Experimental feed^†

Ref

FeM

PBM_64

Ref

FeM

Ref

PBM

PPCon

IRSBM

RegFeM

GoldFeM

IRFeM

IRFeM⁺

_50

CP_ADC

Diet

98 ± 0.09^a

86 ± 1.14^c

93 ± 0.62^bc

97 ± 0.10^ab

95 ± 0.32^abc

97 ± 0.22^abc

98 ± 0.17

97 ± 0.07

98 ± 0.37^ab

96 ± 0.16^abc

89 ± 0.25^c

99 ± 0.01^b

93 ± 0.25^ac

98 ± 0.08^abc

Ingredient

73 ± 2.42^a

88 ± 1.27^ab

96 ± 0.22^b

89 ± 0.80^ab

94 ± 0.81^b

96 ± 0.15

93 ± 0.38^abc

73 ± 0.68^b

100 ± 0.06^a

87 ± 0.51^bc

97 ± 0.24^ac

NPV^‡

Diet

46 ± 6.97^b

29 ± 8.92^ab

33 ± 3.72^ab

23 ± 6.50^a

46 ± 7.69^b

40 ± 11.53^ab

45 ± 7.74

25 ± 1.62

39 ± 1.75^ab

40 ± 0.61^a

35 ± 1.52^ab

38 ± 2.93^ab

31 ± 1.53^b

38 ± 1.95^ab

Ingredient

11 ± 18.76^ab

18 ± 7.75^ab

−6 ± 14.48^a

46 ± 19.00^b

24 ± 42.44^ab

0.34 ± 3.64

40 ± 1.31^a

27 ± 4.11^bc

37 ± 6.60^ab

23 ± 3.06^c

37 ± 5.71^ab

CL_ADC

Diet

94 ± 0.67^abc

83 ± 1.18^c

88 ± 0.64^ac

90 ± 0.14^abc

94 ± 0.73^ab

95 ± 0.35^b

89 ± 0.98

87 ± 0.54

90 ± 1.24^ab

92 ± 0.77^a

89 ± 1.22^ab

91 ± 0.50^ab

85 ± 1.43^b

89 ± 1.73^ab

Ingredient

24 ± 8.08^ab

39 ± 5.97^ab

6 ± 3.65^a

98 ± 3.23^b

101 ± 1.67^b

55 ± 13.97

99 ± 3.51^a

87 ± 4.78^ab

95 ± 2.71^ab

−39 ± 33.82^b

84 ± 19.73^ab

LPV^‡

Diet

81 ± 10.1^a

55 ± 14.3^a

66 ± 6.8^a

60 ± 8.0^a

76 ± 13.7^a

67 ± 14.5^a

50 ± 7.6

22 ± 8.5

74 ± 1.4^a

76 ± 1.0^a

68 ± 3.2^a

74 ± 7.0^a

67 ± 8.1^a

70 ± 4.3^a

Ingredient

−94 ± 98.6^ab

−54 ± 63.9^ab

−459 ± 208.0^a

58 ± 60.9^b

17 ± 68.1^b

−669 ± 220.3

85 ± 4.8^a

50 ± 12.5^a

72 ± 38.3^a

−94 ± 190.0^a

22 ± 49.3^a

OM_ADC

Diet

80 ± 0.58^ab

73 ± 2.06^a

79 ± 0.88^ab

82 ± 0.19^b

80 ± 0.45^ab

75 ± 0.13^ac

76 ± 1.26

81 ± 0.46

79 ± 1.5^ad

83 ± 0.30^c

78 ± 0.36^d

85 ± 0.21^b

81 ± 0.54^e

81 ± 0.40^ae

Ingredient

58 ± 6.81^bd

77 ± 2.91^a

88 ± 0.71^c

81 ± 1.64^ac

65 ± 0.46^d

92 ± 1.67

93 ± 1.04^c

73 ± 1.60^d

100 ± 0.72^b

85 ± 1.76^e

85 ± 1.38^ae

^†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 IR 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 or AquaTrac® sol SD; BM, ultra-flash dried poultry blood meal; IRSBM, Iranian soybean meal. ^‡Nitrogen productive value (NPV); lipid productive value (LPV). The means within one line in each run (1&3) not sharing a superscript letter (a, b, c, d, e, ab, ac, ae, bc, bd, abc) are significantly different (). Values with asterisks are considerably different () in run 2 only. Values for the ingredient IRFeM⁺ were not compared to other values.