Studies on the Application of Bacillus licheniformis in the Production of Meat Rabbits
This experiment was conducted to study the effects of dietary Bacillus licheniformis levels on growth performance,nutrient apparent digestibility,blood biochemical indices,digestive enzyme activity and intestinal development of meat rabbits.A total of 120(35±2)-day-old Hyla meat rabbits(1/2 female)with good body condition and similar body weight were randomly divided into 4 groups with 5 replicates per group and 6 per replicate.Rabbits in the control group were fed a basal diet.Rabbits in the other groups were fed the basal diet supplemented respectively with 70,140 and 210 g·t-1 Bacillus licheniformis.The pre-trial period lasted for 7 days,the formal trial period lasted for 35 days.The results showed as follows:210 g·t-1 Bacillus licheniformis significantly increased the final weight of meat rabbits(p<0.05)compared with the control group,140 and 210 g·t-1 Bacillus licheniformis significantly decreased the ratio of feed to gain(p<0.05).70,140 and 210 g·t-1 Bacillus licheniformis significantly increased average daily gain(p<0.05).The mortality rate of 210 g·t-1 Bacillus licheniformis rabbits was the lowest.210 g·t-1 Bacillus licheniformis significantly increased the apparent digestibility of crude protein,crude fat,crude fiber and total energy(p<0.05)compared with the control group.210 g·t-1 Bacillus licheniformis significantly decreased Bacillus licheniformis blood glucose concentration(p<0.05)compared with control group and 70 g·t-1 Bacillus licheniformis.Compared with control group,140 and 210 g·t-1 Bacillus licheniformis significantly decreased urea nitrogen concentration(p<0.05).210 g·t-1 Bacillus licheniformis significantly increased the concentration of total protein,albumin and globulin(p<0.05).Compared with control and 70 g·t-1 Bacillus licheniformis groups,140 and 210 g·t-1 Bacillus licheniformis significantly increased the lipase activity in jejunum(p<0.05),210 g·t-1 Bacillus licheniformis significantly increased the amylase activity in ileum(p<0.05);70,140 and 210 g·t-1 Bacillus licheniformis significantly increased the activities of lipase and trypsin in ileum(p<0.05)compared with control group.210 g·t-1 Bacillus licheniformis significantly increased duodenal villi length and the ratio of villi length to crypt depth(p<0.05)compared with the control group.In conclusion,dietary supplementation of Bacillus licheniformis can increase growth performance such as final weight and feed conversion rate,increase nutrient apparent digestibility,improve blood biochemical indexes such as protein and digestive enzyme activities,and promote intestinal development of meat rabbits.Under the experimental conditions,the optimal supplemental level of Bacillus licheniformis was 210 g·t-1.
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