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Effect of Chromium Picolinate, Alone or in Combination with Vitamin C or Formic Acid on Growth, Carcass Traits, Immune and Blood Parameters of Broilers under Heat Stress

Effect of Chromium Picolinate, Alone or in Combination with Vitamin C or Formic Acid on Growth, Carcass Traits, Immune and Blood Parameters of Broilers under Heat Stress

Faramin Javandel Soum Sarai1, Mir Daryoush Shakouri2* and Alireza Seidavi3*

1PhD Candidate, Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran
2Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran
3Department of Animal Science, Rasht Branch, Islamic Azad University, Rasht, Iran
 
*      Corresponding author: mdshakouri@uma.ac.ir, alirezaseidavi@iaurasht.ac.ir

ABSTRACT

The experiment was performed to evaluate the effect of chromium picolinate, alone or in combinationwith vitamin C or formic acid on performance, carcass traits and some blood biochemical and hematological parameters of broilers under heat stress (34 ˚C for 8 h). A total of 160 28-d-old Ross 308 broiler chickens were divided into 4 treatment groups with 4 replicates and 10 birds per each by employing a completely randomized design. Broilers were fed on corn-soybean meal basal diets with no additive (control) or added chromium picolinate (400 mg/kg), chromium picolinate (400 mg/kg)­­+­ vitamin C (240 mg/kg) or chromium picolinate (400 mg/kg) +formic acid (0.5%) form 29 to 42 days of age. All supplements significantly improved daily feed intake, daily weight gain and feed conversion ratio of birds compared with the control (P<0.05). The treatments reduced the abdominal fat (P<0.05) and had no effect on the other carcass traits. Relative weight of immune organs was significantly increased by the dietary treatments (P<0.05). The supplements caused a significant increase in total protein and a decrease in glucose, total cholesterol, and LDL cholesterol concentrations (P<0.05). All supplements significantly decrease mean corpuscular volume (MCV), percentage of heterophils and the ratio of heterophil to lymphocyte (H/L), and increased mean corpuscular hemoglobin concentration (MCHC) and white blood cells (WBC) (P<0.05). Addition of formic acid lowered the effect of chromium picolinate on performance parameters, abdominal fat and spleen weights (P<0.05). The results suggest that supplemental chromium picolinate alleviate the adverse effects of heat stress. No synergistic effect was observed between vitamin C or formic acid with chromium picolinate, and in some cases formic acid exacerbated the effect of chromium picolinate.

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Pakistan Journal of Zoology

February

Pakistan J. Zool., Vol. 56, Iss. 1, pp. 01-501

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