Effects of dietary Saccharomyces cerevisiae and butyric acid glycerides on performance and serum lipid level of broiler chickens [Broiler tavuklarda Saccharomyces cerevisiae ve butrik asit gliseridlerinin performans ve serum lipid deǧerleri üzerine etkileri]

This experiment was conducted to evaluate the effects of dietary supplementation of live yeast saccharomyces cerevisiae (sc) and butyric acid glycerides (bag) on broiler performance and serum lipid composition. one-day-old ross 308 female chicks (n=378) were randomly distributed in a 3×3 factorial arrangement with three replicates for each increasing levels of (0,0.002,and 0.004 g/g) bag and (0,0.003,and 0.006 g/g) sc respectively. the experiment lasted 42 d,consisting of starter (1-21 d) and grower (22-42 d) periods. body weight (bw),feed intake (fi),and feed conversion ratio (fcr) were determined by the period for each treatment. on d 42,serum concentrations of triglycerides,cholesterol,and hdl were determined. saccharomyces cerevisiae had no effect on performance in the starter period. however,chicks fed 0,0.002,and 0.004 g/g bag had higher bw and better fcr than control diet (p<0.05). in the grower period bw of chicks fed 0.006 g/g sc was higher than other treatments (p<0.05). for bag both levels improved (p<0.05) bw and fcr. in serum composition,both bag and sc decreased cholesterol concentrations (p<0.05),but the hdl levels were higher (p<0.05) only in 0.006g/g sc fed chicks. there were no significant effects in triglyceride levels among treatments. there were no sc and bag interaction effect on response variables. in conclusion,dietary bag improves growth performance in starter and grower periods but sc was only effective in grower period. moreover,both bag and sc had positive effect on serum lipid composition.