Effects Of Supplemental Different Oils On Performance, Serum Lipid And Fatty Acid Composition Of Tissues In Beijing Duck

The effects of supplemental different oils and different sex on performances as well as serum lipid and faty acid composition of tissues in Beijing ducks was assessed. Four hundred(half of male ) Beijing ducks of 1 day old were used and devided into four treatments by different diets enriched with 0,6% added fat(tallow,bean oil and fish oil ,respectively ) throughout a 42-d growth period .The result indicated that higher weights of 21 days and daily weight gain of 3 weeks before were recorded for T1(no oil diet)than other treatments(P<0.05). after 3 weeks, The daily weight gain of supplemental oil diets were higher than that of T1(P<0.05) .Higher final weight and higher daily weight gain and lower feed/gain were recorded for males than that of females.(P<0.05).liver percentage in male ducks was significant higher than in female ducks(P<0.05). The performance or objective meat quality parameters did not show significant differences among treatments.TG,TC,HDL-C and LDL-C level were not significantly different among treatments and between sexes. The fat contents of liver in ducks fed the diet with fish oil were significant higher than other treatments(P<0.05).The saturated FA(SAT)content was not lower in liver,serum and sebum samples of ducks fed the diets with fish oil and bean oil, although FO and BO diets had less saturated FA than other diets. Coefficient of the regression of SAT tissue on SAT in the diet(R2) was very low.Supplemental bean oil and fish oil in the diets clearly decreased the monounsaturated FA(MUFA)contents in BO and FO tissue samples .because MUFA contents in tissues were closely related to those in the diets(R2>0.9) ,We can increase the MUFA contents in tissues at increasing amounts of dietary MUFA The amount of n-3 polyunsaturated fatty acid(n-3PUFA) in tissues increased when added to the FO diet,mainly as long-chain n-3 FA[eicosapentaenoic fatty acid (EPA)and docosahexaenoic fatty acid(DHA)].On the other hand,levels of total n-6 FA in tissues decreased greatly for FO diet.Not all PUFA in tissues showed the same regression response . All n-6 PUFA in tissues seems to be less linked to their content in diets than n-3 PUFA (R2=0.55 vs 0.95). The EPA and DHA had the highest R2 of all the FA analyzed ,and so their content in tissues was more dependent on their dietary content than on conversion from their precursor.On the other hand ,the n-6PUFA content in liver or blood could be obtained from de novo synthesis through elongation and desaturation from other groups and,to a much lesser extent ,from direct deposit from dietary fat.