Effects Of Lecithin On Growth Performance,Blood Physiological And Biochemical Indexes And Nutrient Digestibility Of Weaned Piglets

The scientists found that the addition of fat/oil to the piglet diet was an effective way to increase the energy value of the feed.In addition,the addition of oil to the feed can not only harmonize the production process of the feed,but also effectively emulsify the oil in the feed,greatly improving the role of oil.However,the supplement of oil in feed could also bring about many adverse effects,such as easy to cause oxidation and rancidity of feed,and difficult to be emulsified in the early stage of animals.Therefore,how to solve the problem of oil in the early application of animals has become a research topic.Lecithin is an aspartic acid surfactant that stabilizes the emulsion by adding a negative charge to it.Lecithin has the characteristics of good water solubility,rich resources and easy to obtain.Lecithin promotes the entry of fatty acids into the micelle,improves the body's fat digestibility and facilitates the transport of nutrients through the membrane.Therefore,the purpose of this experiment was to investigate the effect of dietary lecithin supplementation on the growth performance,blood physiological and biochemical indexes and nutrient utilization rate of weaned piglets.Experiment one:Effects of lecithin on growth performance and blood routine indexes of weaned pigletsA total of 240 weaned piglets were selected(Duroc x(Landrace x Yorkshire))at 24 d,half male and half female.According to the principle of similar body weight,they were equally divided into control group(6.77±0.29 kg)and experimental group(6.73±0.14 kg),with 6 replicates in each group and 20 piglets in one replicates.Piglets in same replicate were fed in one column until to the age of 70 days.The control group was fed basic diet,and the experimental group was fed lecithin diet(basic diet+lecithin).On the day of the end of the experiment,the blood was collected after fast overnight for the determination of blood routine indexes.The levels of leukocyte,erythrocyte,hemoglobin,platelet,hematocrit,erythrocyte mean volume,hemoglobin content,hemoglobin concentration,erythrocyte distribution width,erythrocyte distribution standard difference were measured.The health status and feed consumption of piglets were recorded every day for statistical growth performance and benefits.The results showed that:(1)compared with the control group,dietary lecithin supplementation improved the average daily weight gain and average daily food intake of weaned piglets(P>0.05).(2)compared with the control group,dietary lecithin supplementation could decrease the feed to gain ratio(P>0.05).(3)compared with the control group,dietary lecithin supplementation significantly increased the distribution width of red blood cells in the blood of weaned piglets(P<0.05),significantly decreased the average red blood cell hemoglobin content(P<0.05),and showed a trend of increasing the blood hemoglobin content in weaned piglets(P>0.05).Dietary lecithin supplementation also increased the tendency of leukocyte,erythrocyte,platelet,hematocrit,mean erythrocyte volume and standard deviation of erythrocyte distribution in the blood of weaned piglets(P>0.05).It could be concluded that dietary lecithin supplementation could improve the average daily weight gain,average daily intake and decrease the feed to gain ratio of weaned piglets,which has a positive effect on promoting the performance of weaned piglets.Experiment two:Effects of lecithin on blood biochemical indexes and nutrient digestibility of weaned pigletsThe experiment design was the same as experiment 1.At 70 days of age,blood collection fasting overnight,isolated from serum.Levels of urea nitrogen,creatinine,uric acid,glucose,total cholesterol,triglycerides,high-density lipoprotein cholesterol,low density lipoprotein cholesterol,total bilirubin,total protein,albumin and globulin and activities of aspartate aminotransferase,alkaline phosphatase,lactate dehydrogenase and creatine phosphate kinase in the serum were determined in the present study.The contents of nutrients in feces and feed were measured and the apparent digestibility of nutrients was calculated.The results showed that:(1)compared with the control group,lecithin could significantly increase the levels of total protein and globulin in the serum of weaned piglets(P<0.05),and significantly decrease the levels of triglyceride in the serum of weaned piglets(P<0.05).In addition,dietary supplementation of lecithin had a tendency to decrease the levels of lipoprotein cholesterol and glucose in the serum of weaned piglets(P>0.05),and to increase the levels of high-density lipoprotein cholesterol,creatinine,urea nitrogen,uric acid,total bilirubin,albumin and albumin/globulin in the serum of weaned piglets(P>0.05).(2)compared with the control group,dietary supplementation of lecithin could significantly decrease phosphocreatine kinase and alkaline phosphatase activities in the serum of weaned piglets(P<0.05),and significantly improve activities of lactate dehydrogenase in the serum of weaned piglets(P<0.05).In addition,dietary supplementation of lecithin could decrease the activity of serum alanine glutamate transaminase and glutamate grass transaminase in weaned piglets(P>0.05).(3)dietary supplementation of lecithin could improve the apparent digestibility ratio of crude protein,crude fiber,crude fat and total energy of weaned piglets(P>0.05).Dietary lecithin supplementation could effectively decrease the concentration of serum triglycerides in weaned piglets and improve the apparent digestibility of nutrients.