The study contained two experiments to evaluate the effective energy value of soybean-lecithin oil and to determine the effects of soybean-lecithin oil on growth performance, serum lipid metabolism and rectal microflora number of weaned piglets. Experiment 1 (metabolism experiment):sixteen emasculated pigs (Duroc×Landrance×Yorkshire) with an average body weight of (27.54±1.20) kg were randomly divided into 2 groups with 8 replicates in each group and 1 pig in each replicate. The pigs were fed basal diet and experiment diet which used 4% soybean-lecithin oil replaced basal diet, respectively. The trial lasted for 5 days for adaptation, and 4 days for sampling. Experiment 2 (feeding experiment):fifty four weaned piglets (Duroc×Landrance×Yorkshire, weaned at 23 days of age) with initial body weight of (6.50±0.48) kg were randomly divided into 3 groups with 6 replicates per group and 3 pigs per replicate. Pigs were fed the basal diet (2% soybean oil, control group), 1.0% soybean-lecithin oil diet (50% soybean oil in basal diet was substituted by the same amount of soybean-lecithin oil, 1.0% soybean oil+1.0% soybean-lecithin oil) and 1.5% soybean-lecithin oil diet (50% digestible energy provided by soybean oil in basal diet was substituted by the same digestible energy of soybean-lecithin oil, 1.0% soybean oil+1.5% soybean-lecithin oil). The whole trial lasted for 35 days. The metabolism experiment results showed that soybean-lecithin oil contained 31.32 MJ/kg apparent digestible energy and 30.07 MJ/kg apparent metabolizable energy. The feeding experiment results showed as follows, compared with the control group:1) on day 15 to 35, the average daily feed intake (ADFI) of piglets in 1.0% and 1.5% soybean-lecithin oil group was increased by 6.23% and 3.13% (P>0.05), and the average daily gain (ADG) was increased by 6.66% and 5.28% (P>0.05). Furthermore, on day 1 to 35, the ADFI and ADG of piglets in 1.0% soybean-lecithin oil diet group were improved by 5.34% and 5.64% (P>0.05), respectively. 2) The diarrhea rate and diarrhea index of piglets in 1.0% soybean-lecithin oil diet group were decreased by 5.81% and 13.41% (P>0.05), respectively. 3) The content of serum triglyceride (TG) and free fatty acid in serum of piglets in 1.0% soybean-lecithin oil diet group were reduced by 10.91% and 12.80% (P>0.05); the content of TG, total cholesterol and high density lipoprotein cholesterol in serum of piglets in 1.5% soybean-lecithin oil diet group were reduced by 7.27%, 5.33% and 10.53% (P>0.05), respectively. 4) On day 15, the rectal fecal Escherichia coli number of piglets in 1.0% and 1.5% soybean-lecithin oil diet group was reduced by 4.88% and 4.12% (P>0.05), respectively; on day 36, the rectal fecal Escherichia coli number of piglets in 1.0% soybean-lecithin oil diet group was reduced by 4.88% (P>0.05). In conclusion, the apparent digestible energy and apparent metabolizable energy of soybean-lecithin oil were 31.32 and 30.07 MJ/kg, respectively. 1.0% soybean-lecithin oil replaced equivalent soybean oil in basal diet can improve ADFI and ADG, decrease diarrhea and the rectal fecal Escherichia coli number of piglets to some extent.
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