The Effects Of Botanical Emulsifier On The Fat Metabolism And Performance In Broilers

This study is composed of two parts. The vitro experiments studied emulsibility of botanical emulsifier in oil-water system, and effect of it on lipase activity. The feeding texts studied effects of botanical emulsifier on growth performance, carcass quality and fat metabolism in chickensThe vitro texts studied the emulsification property of botanical emulsifier(SAPS), Glyceryl-polyethylenglycol-ricinoleate (PEGA, Nutrifeed-Veghel, The Netherlands), and the mixture emulsifier (mono-glyceride80%+sucrose ester20%, GMSE) in soybean oil-water, olive oil-water mixed systems. The results showed that the emulsification property order at the same concentration in turn was:PEGA> SAPS> GMSE. Adding any kind of emulsifiers, the reaction rates all were increased in the system of olive oil and lipase. The text also indicated that SAPS had no obvious inhibitory action on lipase activity.Feed text 1.40 14-day AA male broilers were divided four groups (basic diet, 250 mg/kg,375 mg/kg and 500 mg/kg botanical emulsifier). The basic diet contained 6.0% of lard oil. The chickens were raised in separate cages for two weeks (with 6 days of pretrial). Results showed that the group of 375 mg/kg or 500 mg/kg emulsifier improved the average daily gain (p＜0.05), reduced the Feed/Gain of chickens significantly (P＜0.05). According to measurement and calculation, the ME of fat in experimental diet was improved by 8.0%,30.8%,30.8%.Feed text 2.432 male and female mixed chickens (one-day old) were randomly divided into four groups (basic diet,200 mg/kg,250 mg/kg and 300 mg/kg botanical emulsifier), with 3 replications for each group. Animals were butchered after 42 days. Results showed that botanical emulsifier improved the average daily gain (p<0.05), reduced the F/G (P<0.05) of chickens significantly, and the optimal concentration was 300mg/kg. In 300mg/kg group, the rate of leg to chest and the abdominal fat were increased obviously (P<0.05). The botanical emulsifier increased the concentration of NEFA in serum (P＜0.01), cholesterol in serum and liver (P＜0.05), and the rate of LPL in abdominal fat and chest (P＜0.05). However, it reduced the concentration of MDH in liver (P＜0.05), and the activities of LPL in abdominal fat and chest (P＜0.05).Feed text 3.360 fourteen-day old Guangda-yellow chickens were divided into 4 groups with 3 replications and 30 each (50% males and females), containing different botanical emulsifier levels,0,100,150,200mg/kg in basic diet, respectively. The text lasted four weeks. The results showed 1) in 100mg/kg group, botanical emulsifier increased average daily gain of chickens by 9.1%(P<0.05) compared to control, but had not significant effects on the F/G (P＞0.05); 2) the digestibility of dry matter increased by 4.41%(P<0.05),1.93%(P>0.05),2.13%(P>0.05), the digestibility of crude fat and crude protein increased by 2.24%(P>0.05),2.92%(P<0.05), 3.25%(P<0.05) and by 4.16%(P>0.05),4.92%(P<0.05),4.43%(P<0.05), the digestibility of phosphorus and calcium were not significantly affected; 3) in 150, 200mg/kg groups, pancreas lipase activities were increased(P＜0.01), all emulsifying agent levels had no significant effect on duodenal lipase activities (P>0.05).All studies indicated that the appropriate amounts of botanical emulsifier increase the growth performance and carcass quality, reduce the F/G of chickens by stimulating the digestibility of fat in basic diets.