Effects Of Lysolecithin On Production Performance,nutrient Utilization And Serum Biochemical Indexes Of Broiler Chickens

In this study,different concentrations of lysolecithin（LPC）were added to diets with different energy levels to study its effects on broiler chickens production performance,nutrient utilization and serum biochemical indexes,so as to provide a scientific basis for the application of LPC in broiler chickens breeding.In this study,756 0-day-old healthy broiler chickens were randomly divided into 7treatments,with 6 replicates in each treatment and 18 broiler chickens in each replicate.The broiler chickens feed was divided into two stages: 1-21 days and 22-42 days.In each stage,each treatment group was fed diets with different levels of metabolizable energy（ME）and supplemented with different concentrations of LPC.Treatment 1 was the control group,fed with basic diet 1（d 1-21,ME 12.54 MJ/kg;d 22-42,ME 12.96 MJ/kg）;treatments 2 and 3were fed diet 2（d 1-21,ME 12.42 MJ/kg;d 22-42,ME 12.83 MJ/kg）,and 500 mg/kg and 750mg/kg LPC were added to diet 2 respectively;treatments 4 and 5 were fed diet 3（d 1-21,ME12.29 MJ/kg;d 22-42,ME 12.71 MJ/kg）,and 500 mg/kg and 750 mg/kg LPC were added to diet 3 respectively;treatments 6 and 7 were fed diet 4（d 1-21,ME 12.21 MJ/kg;d 22-42,ME12.62 MJ/kg）,and 500 mg/kg and 750 mg/kg LPC were added to diet 4 respectively.The feeding period was 42 days.Energy levels were adjusted by varying the amount of soybean oil added.The results showed that:（1）in the whole period of 1-42 days,compared with treatment 1,the average daily gain（ADG）of broiler chickens in treatment 3 increased significantly and the feed weight ratio（F/G）decreased significantly（P < 0.01）.While the ADG of broiler chickens in treatment 6 was significantly lower than that in treatment 1（P <0.01）.The F/G of broiler chickens in treatment 6 and 7 was significantly higher than that in other treatment groups（P < 0.01）.（2）At 1-21 days of age,compared with treatment 1,the apparent utilization of crude fat（EE）and dry matter（DM）of broiler chickens in treatments 5and 7 were significantly increased（P < 0.01）.At 22-42 days of age,treatment 3,treatment 4,treatment 5,treatment 6 and treatment 7 broiler chickens had significantly higher apparent utilization of EE and DM compared with treatment 1（P < 0.01）.（3）At 1-21 days of age,compared with treatment 1,the contents of serum albumin（ALB）,urea（UREA）,uric acid（UA）,triglyceride（TG）,low-density lipoprotein（LDL）of broiler chickens in treatment 2were significantly decreased（P < 0.01）.The serum alanine aminotransferase（ALT）and highdensity lipoprotein（HDL）of broiler chickens in treatment 3 were significantly increased,while UREA and TG were significantly decreased（P < 0.01）.The contents of serum UA,TG,and LDL of broiler chickens in treatment 4 and treatment 6 were significantly decreased（P <0.01）.The contents of serum ALB,UREA,TG,cholesterol（TCHO）,and HDL of broiler chickens in treatment 5 and treatment 7 were significantly decreased（P < 0.01）.The contents of serum LDL of broiler chickens in treatment 6 and treatment 7 was significantly increased（P < 0.01）.At the age of 22-42 days,compared with treatment 1,the serum aspartate aminotransferase（AST）,alkaline phosphatase（ALP）and total protein（TP）of broiler chickens in treatment 2 and treatment 3 were significantly decreased（P < 0.05）.The contents of serum TP and TG of broiler chickens in treatment 4 and treatment 5 were significantly decreased（P < 0.01）.The serum UA content of broiler chickens in treatment 3 and treatment6 were significantly increased（P < 0.01）.In summary,adding LPC 750 mg/kg to feeds with metabolizable energy levels of 12.42MJ/kg and 12.83 MJ/kg for 1-21-day-old and 22-42-day-old broiler chickens could significantly increase the ADG and reduce the F/G of broiler chickens,improve broiler chickens production performance.Adding LPC 750 mg/kg to the diets of 1-21 day old broiler chickens with feed metabolizable energy levels of 12.29 MJ/kg,12.21 MJ/kg and 22-42 day old broiler chickens with different energy levels could significantly improve the utilization of DM and EE,which effectively improves the feed efficiency.When the metabolizable energy level of 1-21-day-old broiler chickens feed were 12.42 MJ/kg,adding LPC 500 mg/kg and12.29 MJ/kg adding LPC 750 mg/kg significantly reduced the contents of TG,TCHO and LDL in serum of broiler chickens.Adding LPC 750 mg/kg to the feed metabolizable energy level of 22-42-day-old broiler chickens significantly reduced the activities of AST,ALP and the content of TG in serum of broiler chickens.Therefore,LPC can reduce the damage to the liver and heart of broiler chickens to a certain extent,improve the ability of broiler chickens to remove cholesterol from the body,and promote the metabolism of fat and the digestion and absorption of nutrients.