Effects of chilli (Capsicum frutescens linn.) meal on growth performance, ileal digestibility and lipid peroxidation in broilers under high density condition
Abstract:
An experiment was conducted to investigate the effects of chilli (Capsicum frutescens Linn.) meal on growth performance, ileal digestibility and lipid peroxidation in broilers under high-density condition. Total 664 day-old male Cobb-500 chicks were randomly allocated into 10 treatments of 4 replicates. The treatments contained 9 groups of high-density and 1 group of normal-density. Birds were raised on floor pens in open-sided housing for 41 days. The treatments comprised 2 control diet groups with difference density of bird per pen, control diet supplemented with avilamycin 2.5 mg/kg, control diet supplemented with α-tocopheryl acetate 250 mg/kg, and diets composed of chilli granule, chilli powder, and chilli meal at level of capsaicin 20 and 30 mg/kg respectively. On day 21 and 41 of the experiment, body weight, and feed intake were recorded and 2 broilers/replicate were randomly selected for collecting blood sample at wing vein. Stress Index and Thiobarbituric Acid Reactive Substance (TBARS) in plasma was analyzed. Ileal content was collected and analyzed for nutrient digestibility. Stability of capsaicin in all forms of chilli were also determined. Stability of capsaicin in chilli meal decreased when storage time increased. Decreasing level of capsaicin in chilli meal was higher than the other forms. On day 21 and 41, Stress index of birds fed with chilli of all forms tended to decrease (P>0.05) while their lipid peroxidation in plasma significantly decreased comparing to high-density control group (P<0.05) but it was not different with normal-density control group, and control diet supplemented with avilamycin or α-tocopheryl acetate (P>0.05). Ileal nutrient digestibility of all groups on day 21 and 41 were not different (P>0.05). Growth performance of overall experimental period was considered. Final weight and daily weight gain of all forms of chilli fed groups were higher than high-density control group (P<0.05) but were not different from normal-density control group and control diet supplemented with avilamycin (P>0.05). Chilli meal gave higher weight gain than chilli granule but not different from chilli powder. Both capsaicin level of all chilli forms were not different (P>0.05). In conclusion, Chilli meal could be used as an ingredient in broiler diet to increase bird weight and capsaicin at the level of 20 mg/kg can decrease plasma lipid peroxidation in broiler under high-density condition. The response of chilli on growth performance and lipid peroxidation in plasma were higher in starter than grower period.