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Table 2 Effects of dietary selenium levels and sources on blood parameters of 17-d-old broiler chickens

From: Selenium source and level on performance, selenium retention and biochemical responses of young broiler chicks

Selenium source1 Selenium levels, mg/kg Means SEM2 P-value
0.0 0.08 0.16 0.24 0.32 Source Level S X L3 L4 Q5
Glutathione peroxidase, U/L
 Means 79.1 D 153 C 216 BC 266 AB 319 A   24.3 <0.01 <0.01 0.121 <0.01 0.406
 SS 93.8 C 165 BC 240 AB 335 Aa 334 A 233      <0.01e 0.174
 SY 62.8 C 126 BC 194 B 198 Bb 304 A 183      <0.01e 0.904
Superoxide dismutase, U/L
 Means 98.7 88.9 92.1 81.9 92.9   7.17 0.524 0.647 0.394 0.647 0.243
 SS 98.5 86.4 91.8 88.0 93.4 91.6      0.887 0.187
 SY 98.9 91.5 92.5 75.8 92.3 90.2      0.420 0.549
Total T3, ng/ml
 Means 3.32 2.30 3.01 2.51 2.73   0.125 0.419 0.056 0.134 0.278 0.241
 SS 3.99 Aa 2.41 B 3.39 AB 2.59 AB 2.84 AB 2.87      0.136 0.018
 SY 2.76 b 2.16 2.75 2.45 2.59 2.68      0.816 0.682
Free T3, ng/ml
 Means 0.0056 0.0045 0.0059 0.0059 0.0054   0.0002 0.336 0.270 0.089 0.344 0.786
 SS 0.0060 0.0042 0.0050 b 0.0060 0.0055 0.0053      0.648 0.163
 SY 0.0052 AB 0.0048 B 0.0068 Aa 0.0059 AB 0.0053 AB 0.0056      0.343 0.091
Free T4, ng/ml
 Means 31.6 36.4 38.8 32.9 35.9   0.942 0.416 0.050 0.403 0.627 0.140
 SS 34.0 37.5 42.7 34.5 37.5 35.2      0.604 0.048e
 SY 29.3 36.0 37.2 31.0 34.3 36.6      0.805 0.057e
Free T3:Free T46
 Means 1.58 1.35 1.44 1.87 1.72   0.226 0.230 0.078 0.735 0.070 0.125
 SS 1.60 1.36 1.28 1.79 1.53 1.51      0.575 0.531
 SY 1.56 1.34 1.59 1.95 1.91 1.67      0.037 0.451
  1. 1 SS sodium selenite, SY selenium enriched-yeast
  2. 2 Standard error of means
  3. 3 Interactive effects between selenium and trace minerals sources and selenium levels
  4. 4 Linear effect of supplementation selenium levels
  5. 5 Quadratic effect of supplementation selenium levels
  6. 6 Free T3:Free T4 x 10000
  7. A-B Different uppercase letters in the same line and lowercase letters in the same column are different by Tukey test at 5%
  8. e Different superscripts letter indicates difference in the orthogonal contrasts between equations