Study On Improving Fat Utilization Of Early Weaned Piglets

Two experiments were conducted to determined the effects of fat type, lipase addition and lecithin on growth performance and nutrient utilization of early weaned piglets. In Exp.1, by two-step enzyme method of in-vitro method, seven kind of fat sources was selected for early weaned piglets. In Exp.2, diets which added the selected oil addtion were supplemented with 0.02% lipase and 0.4% lecithin to improve fat utilization. Providing scientific foundation is to eatablish a practise instructing significance of feed energy sources supplying mode .In the first trial, two-step in-vitro method was to simulate the animal digestive physiology. The experiment estimated nutrient digestibility and three enzymatic activity using peps-in-HCL solution and trypsin complex to treat samples. According to fatty acid composition of oil, the four kind of oils were selected: soybean oil that are rich in long-stain unsaturated fatty acid, coconut oil that are rich in short-strain saturated fatty acid, lard and palm oil that are rich in long stain saturated fatty acid.They were formulated to seven mixed oil according to fatty acid composition of milk fat, unsaturated fatty acid /saturated fatty acid ratio and long stain saturated fatty acid/medium- stain saturated fatty acid ratio were similar. Diets were supplemented with 4 % fat combinations. The digestion trial was conducted to compare the effect of the seven fat complex feed on nutrient digestibility and three enzymatic activity. Ether extract and crude protien digesti- bility of feed and three enzymatic activity in liquid were measured. Applying enzyme solution of vitro digestion mensurated.The result were showed that the diets of soybean oil︰ palm oil︰coconut oil=3︰6︰1 (treatment 4)and soybean oil︰palm oil = 1︰3(treatment 7) increased ether extract and crude protien digestibility than the other dietary fat combinations and high in lipase activity. Trypsin and amylase were improved for the two treatments too. From the above results, we can have the implication that treatment 4 and treatment 7 were selected to conduct the next animal experiment.In the second trial:Twelve litters crossbred (Yorkshire×Landrace) piglets that age is close were selected to evaluate pig growth reactions which fed one of several dietary lipid sources during a 4-wk postweaning period. In the second trial of this study, a total of 72 piglets weaned at 21 days of age were randomly allotted into six treatments based on body weight. For each treatment, there were three replicates and four piglets in each replicate. The diets of these treatments had the same nutrient level, GroupⅠand groupⅡwere oilⅠand oilⅡrespectively. The dietary ratio between soybean oil, palm oil and coconut oil for two different oil complex were as...