Table 6 Effects of dietary Fe on Fe contents in tissues of broilers on d 21

Control¹

0

32.6

28.0*

75.3*

243

FeSO₄∙7H₂O¹

20

30.6

39.1

97.7

252

40

33.2

47.3

101

240

60

35.7

48.8

102

247

Fe-Prot ES¹

20

31.9

50.8

106

255

40

32.7

57.4

117

253

60

36.4

53.2

121

264

Feed grade NaFeEDTA¹

20

36.9

42.6

105

260

40

35.6

53.0

123

246

60

35.3

50.9

133

258

Food grade

NaFeEDTA¹

20

37.1

49.3

116

250

40

38.2

46.3

118

251

60

36.6

48.6

134

259

Pooled SE

1.58

3.67

8.06

7.24

Fe source²

FeSO₄∙7H₂O

33.2^C

45.1

100^B

246

Fe-Prot ES

34.1^BC

53.8

115^A

257

Feed grade NaFeEDTA

35.9^AB

48.8

120^A

255

Food grade NaFeEDTA

37.3^A

48.1

122^A

253

Pooled SE

0.91

2.06

4.78

4.36

Added Fe level³, mg/kg

20

34.1

45.5

106^b

254

40

35.2

51.0

115^ab

247

60

36.0

50.3

123^a

257

Pooled SE

0.79

1.82

4.31

3.83

P-value

Fe source

0.0058

0.0532

0.0098

0.3819

Added Fe level

0.2659

0.0782

0.0348

0.2117

Fe Source × added Fe level

0.2505

0.5518

0.8321

0.9325

Linear effect⁴

0.0634

–

< 0.0001

–