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Table 11 Estimation of relative bioavailability values (RBV) of the 3 organic Fe sources1

From: The chemical characteristics of different sodium iron ethylenediaminetetraacetate sources and their relative bioavailabilities for broilers fed with a conventional corn-soybean meal diet

 

Regression coefficient, slope (mean ± SE)

RBV, % (mean ± SE)

 

Dependent variable

FeSO4∙7H2O

Fe-Prot ES

Feed grade

NaFeEDTA

Food grade

NaFeEDTA

FeSO4∙7H2O

Fe-Prot ES

Feed grade

NaFeEDTA

Food grade

NaFeEDTA

P-value2

PI

0.114 ± 0.019B

0.108 ± 0.019B

0.122 ± 0.018AB

0.137 ± 0.019A

100

95 ± 9

106 ± 8

120 ± 8

0.02

TS

4.505 ± 0.845

4.221 ± 0.801

4.562 ± 0.773

4.918 ± 0.806

100

94 ± 15

101 ± 14

109 ± 14

0.34

Liver Fe

5.821 ± 2.513B

9.228 ± 2.445A

10.414 ± 2.387A

10.883 ± 2.506A

100

159 ± 24

179 ± 26

187 ± 26

< 0.0001

Liver SDH activity

0.108 ± 0.051

0.131 ± 0.049

0.137 ± 0.048

0.147 ± 0.050

100

121 ± 23

127 ± 23

136 ± 24

0.15

Heart SDH activity

0.254 ± 0.095B

0.283 ± 0.091AB

0.337 ± 0.091AB

0.365 ± 0.093A

100

111 ± 19

133 ± 19

144 ± 20

0.03

Kidney SDH activity

0.237 ± 0.111B

0.327 ± 0.109AB

0.424 ± 0.106A

0.438 ± 0.111A

100

138 ± 24

179 ± 28

185 ± 28

0.0007

Liver CAT activity

0.328 ± 0.123C

0.508 ± 0.119B

0.512 ± 0.119AB

0.635 ± 0.122A

100

155 ± 21

156 ± 21

194 ± 23

< 0.0001

Liver COX activity

2.236 ± 0.533

2.450 ± 0.519

2.410 ± 0.514

2.572 ± 0.522

100

112 ± 12

108 ± 12

115 ± 12

0.23

Liver SDH mRNA

0.073 ± 0.027B

0.107 ± 0.027A

0.117 ± 0.027A

0.123 ± 0.027A

100

147 ± 20

160 ± 21

169 ± 21

< 0.0001

Kidney SDH mRNA

0.054 ± 0.024B

0.092 ± 0.023A

0.094 ± 0.023A

0.088 ± 0.024A

100

170 ± 25

174 ± 26

160 ± 25

< 0.0001

  1. PI Plasma iron, TS Transferrin saturation, CAT Catalase, SDH Succinate dehydrogenase, COX Cytochrome C oxidase
  2. 1Based on multiple linear regressions of the above dependent variables on daily dietary analyzed Fe intake. Daily dietary analyzed Fe intake = average daily feed intake during 1–21 days of age times the dietary analyzed Fe content for each respective Fe source. Regression analyses of the above dependent variables were based on cage averages with 21 cages (3 chicks killed/cage) per Fe source
  3. 2P-value for the difference in slopes among Fe sources
  4. A–CMeans with different superscripts within the same row differ (P < 0.05)