Abstract: This study was designed to investigate the effects of supplementation of composite probiotics on production performance of layer breeders. A flocks of 384,15-week-age Hy-line brown parents were randomly divided into four groups,each group was assigned 4 replications and 24 layers per replication. Control group was fed basal diet, test 1, 2, 3 groups were added 50,100,200 g/t of composite probioticsin in the basal diet. The results showed that the test 3 group of average eggs weight was significantly higher than the control group (P＜0.05), but open day age later than the control group. In 27 to 30-week-age, the test 2 group greatly improved the laying ratio and reduced the ratio of feed to eggs (P＜0.05), but the test 3 group of the laying ratio was significantly lower (P＜0.05) and the ratio of feed to eggs was higher (P＞0.05). The reproductive performance index had no significant difference in each group. Therefore, feed composite probiotics could improve the chicken egg early production performance, the amount of 100 g/t of composite probiotics was appropriate for the experiment.

Key words: composite probiotics; layer breeders; open production index; egg laying performance; reproduction performance