Abstract:

In order to investigate the effects of Lactobacillin on growth performance and slaughter performance of broilers. 300 one-day-old broiler chickens were randomly divided into five groups with four replicates in each group and 15 chickens per replicates. The chickens in control group (groupⅠ) were only fed with basic diet. Those in groupⅡ were fed with basic diet supplemented with antibiotics that was composed with 60 mg/kg Colistin sulfate whose content was ten percent and 200 mg/kg Zinc Bacitracin whose content was fifteen percent. And those in other groups (groupⅢ, Ⅳ,Ⅴ) were fed basic diet supplemented with Lactobacillin of 50, 100, 200 mg/kg, respectively. The experiment lasted for 70 days. And the growth performance and slaughter performance were respectively measured on the 70th day. The results showed that the average feed intake had no significant difference in every group (P>0.05). The average weight gain of groups Ⅱ and Ⅳ were higher than groupⅠ (P<0.05), but the average weight gain of groups between groupⅡ and groupⅣ was not significantly deference. The feed conversion rates of group Ⅳ were significantly lower than groupⅠ (P<0.05) at 70th day. The whole net carcass rate and half net carcass rate had no significantly difference in every group (P>0.05). The percentage of breast muscle and leg muscle of group Ⅱ and Ⅳ were higher than groupⅠ (P<0.05), significant differences were not observed between other groups (P>0.05). It was concluded that 100 mg/kg Lactobacillin could reduced the growth performance and slaughter performance of broilers.