IMPACT OF CHROMIUM PICOLINATE SUPPLEMENTATION ON PRODUCTIVE PERFORMANCE, IMMUNE RESPONSE AND HEAT SHOCK PROTEINS OF BROILER CHICKENS UNDER HEAT-STRESS CONDITION. | ||||
| Egyptian Poultry Science Journal | ||||
| Article 15, Volume 37, Issue 2, June 2017, Page 559-583 PDF (518.33 K) | ||||
| Document Type: Original Article | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Waheed Ezzat | ||||
| 1Dept. of Poult. Breed. Res. | ||||
| Abstract | ||||
| The present study conducted to investigate the effect of heat stress and early age of thermal condition (at 3 days of age) for broiler chickens were fed diets supplemented with or without chromium picolinate (CrPic) to study its effects on growth performance, some physiological parameters, plasma biochemical traits as well as, immune response, heat shock proteins and carcass characteristics. Unsexed 300 one-day-old Hubbard broiler chicks were individually weighed and randomly distributed into 5 experimental treatments with 3 replicates (20 chicks each) per pen from 1–42 days of age. The 1st treatment (T1) served as a control and was fed a control basal diet and reared under natural conditions (25°C). The 2nd treatment (T2) and 3rd treatment (T3) were daily exposed to heat stress (33°C)and 65% relative humidity and 1200 μg/chromium picolinate (CrPic) /kg diet was added for T3 only, the 4th treatment (T4) and 5th treatment (T5) were daily exposed to heat stress (33°C) during the experimental period and at 3 days of age were exposed to early age of thermal condition (early heat shock exposure) and 1200 μg/chromium picolinate (CrPic) /kg diet was added for T5 only. After the end of thermal condition atearly age T4 and T5 returned to be reared underdaily heat stress (33°C). The obtained results showed that heat stress caused a significantly (p≤0.05) decrease body weight (BW), weight gain (BWG), feed intake (FI), feed conversion (FC), hemoglobin concentration (Hb), red blood cells (RBCs), white blood cells (WBCs), lymphocytes% (L%), antibody titers against infectious bronchitis virus (IBV), Newcastle virus (NDV), influenza viruses (H9N2), immunoglobulin G (IgG) and immunoglobulinM (IgM) concentrations, totalprotein, albumin and high density lipoprotein (HDL), superoxide dismutase (SOD), glutathione peroxidase (GPX), Triiodothyronine (T3) and thyroxine (T4) hormones. While, there were significant (p≤0.05) increases mortality rate, respiration rate, heterophils % (H %), H/L ratio, glucose, cholesterol, LDL, total lipids and triglycerides, corticosterone, total antioxidant capacity (TAOC), HSP70 expression of liver and abdominal fat as compared with the thermoneutral control broiler chicks.However, supplementation of chromium to the broiler chicks diet was able to alleviate many of deleterious effects. The present results indicate that the supplementation of diets with 1200 μg/chromium picolinate (CrPic)/kg diethas been considered to overcome the deleterious effects of heat stress on broiler performance. | ||||
| Keywords | ||||
| Broilers Heat Stress-Heat shock-Chromium Growth performance-Blood parameters | ||||
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