Global warming is causing severe effects on climatic condition of Pakistan. The temperature during summer reaches more than 50oC, causing problem to control inside temperature of poultry houses. To overcome the negative effects of heat stress, different (synthetic) anti-stressors are being used in poultry industry. A total of 360 day-old Cobb-500 broiler chicks were procured from the commercial hatchery and were placed according to Completely Randomized Design. These birds were subjected to “Cyclic Heat Stress” of 35±1oC and 75±5% relative humidity for 8 hours per day in the last two weeks (4th and 5th). During this period, 5 dietary treatments {Control, Chia Seed (5g/kg), Turmeric powder (5g/kg), Betaine (3g/kg) and Vitamin C (650mg/kg)} were supplemented through feed. All the treatments were replicated 6 times with 12 birds per replicate. The effect of these treatments were evaluated for growth performance,carcass cut-up yield, meat quality,physiological response and lipid-oxidation profile of broilers exposed to cyclic heat stress. The data collected were analyzed through Analysis of Variance (ANOVA) technique with the help of SAS 9.4 for Windows x64 based systems. The means were compared with Duncan’s Multiple Range (DMR) test.The results of present studyshowed that bird supplemented withChia Seed had significantly highestbody weight, feed conversion ratio, feed efficiencyand production number. Whereas, Betainesupplemented birds had highest feed consumption. Similarly, in carcass yield and meat quality Turmeric supplemented birds had higher head (%), neck (%), meat color at 2 hr meat color 24 hr and cholesterol, while, Chia Seed supplementation resulted in higher breast (%). Different anti-stressors like Chia Seed and Turmeric showed better antioxidant status of broiler meat.

CONCLUSION
Based on the findings of the present study it can be concluded that:
1. Broilers supplemented with Chia Seed had better growth performance, breast yield and economics.
2. Turmeric supplementation had showed decreased cholesterol level, better meat quality and minimum drip loss (%).
3. Betaine supplementation had showed better feed consumption and apparently better immune status of broilers.
4. Turmeric and Chia Seed had showed better antioxidant status in broilers meat.
SUGGESTION AND RECOMMENDATIONS:
Suggestion for future researcher
Present study has focused on comparison of different anti-stressors for growth performance, meat quality, blood metabolites and immune status. Based on the findings and personal experience here are few suggestions for future researchers.
1. Future researcher may investigate different inclusion levels of Chia Seed, Turmeric and other natural anti-stressors or their phase feeding for better growth performance and meat quality during heat stress.
2. Future researchers should also investigate the gene expression and heat shock proteins followed by supplementations of different anti-stressors.
3. Chia Seed has good fatty acid and Turmeric has good antioxidant profile, so future researchers may also work on the meat fatty acid and antioxidant profile.