Effect of combination of growth promoter of Cinnamaldehyde, Capsaicin, and Carvacrol on performance and cecal microbial population of broiler chickens under heat stress

This study was performed to investigate commercial plant growth promoter (CPGP) (Cinnamaldehyde, Capsaicin, and Carvacrol) on performance, and cecal microbial population of broiler chickens under heat stress. The experiment was done with 4 treatments and 4 replicates with 176 one-day-old chicks in completely randomized design. Treatments were control (without phytogenic), and different levels of CPGP (100, 200, and 300 mg/kg). Heat stress was performed from 22 days of age. Treatments were control (without phytogenic), and different levels of CPGP (100, 200, and 300 mg/kg). Heat stress was performed from 22 days of age. The results of experiment showed that dietary inclusion of 200 mg/kg of CPGP to the diet decreased feed intake (P<0.05) compared to the birds receiving the control diet at the starter period. At the whole period of experiment, dietary inclusion of 300 mg/kg of CPGP improved body weight gain compared to the other treatments (P<0.05). Also, at the starter and whole period of experiment, dietary inclusion of 300 mg/kg of CPGP had better feed conversion ratio compared to the control diet and 100 mg/kg of CPGP (P<0.05). The birds that consumed 300 mg/kg of CPGP significantly had lower abdominal fat pad compared to the birds receiving the control diet and the diet containing 100 mg/kg of CPGP (P<0.05).  Dietary inclusion of CPGP had not significant effect on cecal bacterial population and blood parameters of broiler chickens (P>0.05). It can be concluded that dietary inclusion of 300 mg/kg of CPGP can be improved performance and decrease abdominal fat pad of broiler chickens under heat stress.