Table 5.
Average values of substances reactive to thiobarbituric acid (TBARS), in MDA mg/kg in the breast meat of broiler chickens refrigerated for 24 h, frozen at −20°C for 20 d and 40 d, fed with diets containing different vitamin A supplementation.
Vitamin A (IU/Kg) |
||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Supplementation1 | 0 | 6,000 | 16,000 | 26,000 | 36,000 | 46,000 | Average2 | SEM | P (Anova) | P (Test F) | P (Regression) | |
24h | T – 21 | 0.028 | 0.029 | 0.023 | 0.030 | 0.032 | 0.030 | 0.0287 | 0.01222 | 0.7579 | 0.1180 | 0.6346 |
T – 42 | 0.037 | 0.034 | 0.028 | 0.029 | 0.033 | 0.040 | 0.0335 | 0.01816 | 0.7850 | 0.1359 | ||
20d | T – 21 | 0.026 | 0.025 | 0.040 | 0.030 | 0.030 | 0.053 | 0.0034 | 0.22564 | 0.3425 | 0.62310 | 0.1625 |
T – 42 | 0.032 | 0.027 | 0.059 | 0.039 | 0.065 | 0.060 | 0.0476 | 0.03162 | 0.0795 | 0.6526 | ||
40d | T – 21 | 0.016 | 0.015 | 0.014 | 0.013 | 0.014 | 0.015 | 0.0144 | 0.00593 | 0.9188 | 0.3046 | 0.2614 |
T – 42 | 0.013 | 0.012 | 0.020 | 0.014 | 0.017 | 0.018 | 0.0157 | 0.00672 | 0.2614 | 0.6218 |
L, linear; Q, Quadratic.
T-21 d: birds supplemented with treatments in the period of the 4 to 21 days of age; T-42 d: birds supplemented with treatments in the period of the 4 to 42 days of age.
Test F (P ≤ 0.05) for comparing the averages of vitamin A supplementation times.