Table 2

Body weights, Fe intakes, hemoglobin maintenance efficiency (HME), and total body Hb Fe content in chicken fed the tested diets from d 0 to d 561.

Treat*

Day 0

Day 7

Day 14

Day 21

Day 28


Body weight (g)


High Fe

42.5a ± 2.1

107.6a ± 3.9

214.6a ± 5.8

427.8a ± 16.8

684.3a ± 21.9


Low Fe

42.9a ± 2.6

103.9a ± 4.3

204.1a ± 9.1

398.7a ± 18.8

599.9b ± 26.1


Feed intake (kg/d)2


High Fe

-

0.02a ± 0.005

0.07a ± 0.008

0.07a ± 0.01

0.08a ± 0.01


Low Fe

-

0.02a ± 0.006

0.06a ± 0.007

0.07a ± 0.009

0.08a ± 0.01


Fe intake (mg) 3


High Fe

-

9.6a ± 0.7

33.8a ± 1.5

58.7a ± 4.9

87.6a ± 6.5


Low Fe

-

7.0b ± 0.5

23.3b ± 1.8

44.4b ± 3.8

65.6b ± 4.9


Hemoglobin (g/L)


High Fe

90.50a ± 8.3

85.85a ± 4.0

79.60a ± 4.5

80.14a ± 6.5

75.50a ± 3.1


Low Fe

90.70a ± 8.7

78.40a ± 4.7

76.10a ± 3.7

78.40a ± 2.3

73.71a ± 2.3


Total body Hb Fe content (mg)4


High Fe

1.08a ± 0.06

2.62a ± 0.18

4.83a ± 0.31

9.77a ± 0.58

15.04a ± 0.65


Low Fe

1.11a ± 0.08

2.36a ± 0.24

4.58a ± 0.29

8.50b ± 0.35

12.58b ± 1.03


Hemoglobin maintenance efficiency (HME, %)5


High Fe

-

16.0a ± 1.9

11.0a ± 0.9

14.7a ± 1.0

15.9a ± 0.7


Low Fe

-

18.5a ± 3.8

15.1b ± 1.2

16.7b ± 0.7

17.6a ± 1.3


a, b Within a column, means without a common letter are significantly different, P < 0.05.

1Values are means ± SEM, n = 12.

2Values are mean daily feed intakes for the 7 days proceeding the day designated in the column heading.

3Values are mean ± SEM (cumulative weekly from day 0)

4,5Fe bioavailability was calculated as hemoglobin maintenance efficiency (HME) (7,10-14):

<a onClick="popup('http://www.nutritionj.com/content/10/1/113/mathml/M3','MathML',630,470);return false;" target="_blank" href="http://www.nutritionj.com/content/10/1/113/mathml/M3">View MathML</a>

Where Hb-Fe = total body hemoglobin Fe. Hb Fe was calculated from hemoglobin concentrations and estimates of blood volume based on body weight (a blood volume of 85 mL per kg body weight is assumed) (10,11,14,23):

<a onClick="popup('http://www.nutritionj.com/content/10/1/113/mathml/M2','MathML',630,470);return false;" target="_blank" href="http://www.nutritionj.com/content/10/1/113/mathml/M2">View MathML</a>

* The experimental diets: 1. "High Fe": 60% colored bean diet (54ppm Fe); 2. "Low Fe": 60% colored bean diet (42ppm Fe).

Tako et al. Nutrition Journal 2011 10:113   doi:10.1186/1475-2891-10-113

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