The 20C that fish oil place contains: 5n-3 (Eicosapentaenoic, EPA) reach 22C: 6n-3 (Docosahexaenoic, DHA) it is certain to make collect the fryer that feeds fish oil to have fight tender the function of disease of bug of Ai Meier ball (Allen, 1998) . EPA and DHA fight tender action mechanism includes the possibility of disease of bug of Ai Meier ball two respects: Enter helminth system through osmosis namely inside the organization, make helminth body organizes the oxidisability attack to gobbling up a cell to become more sensitive, cause tender bug of Ai Meier ball fights the oxidisability that gobbles up a cell to atttack ability to reduce (Allen, 1998) ; In addition, produce effect possibly still through animal immunity system, the adverse effect that reduces inflammation to answer an animal to arise instead (Korver, 1997) .
When ration does not add drug of the bug that fight a ball, chicken contracts ball bug disease extremely easily, to 14 ～ right now the chicken ration of 21 day age adds Gao Shuiping (5 ％ ) fish oil, the result that produces property normally to maintaining chicken is best; Ration adds drug of the bug that fight a ball or when the possibility of disease of bug of chicken infection ball is lesser, the fish oil that adds 2 ％ of 1 ～ can make chicken manages good manufacturing property. But when adding flax seed oil, although add a level to be as high as 15 ％ , still cannot achieve as identical as fish oil or similar result (Allen, 1996; Allen, 1998) . The metabolization characteristic of acid of the flax inside likelihood and animal airframe concerns its reason. Acid of the flax inside airframe can be changed generate EPA and DHA, but the influence of the element such as the scale that changes efficiency to suffer animal sort and ration N-6 and N-3 PUFA, if become,the scale of day of N-6 in grain and N-3 PUFA exceeds 5: 1 when, flax changes ability acerbitily to drop (Bjerve, 1987) , exceed 10: 1 when, the way of EPA of flax acerbity translate into and DHA stops almost (Pike, 1999) ; And to pig and birds, morgan (1992) report, acid of the flax inside its body changes the capacity that builds EPA and DHA very finite.
The ration of healthy fryer is added fish oil and do not add fish oil or compare with additive other grease photograph, grow to the fryer the report of the influence is abhorrent, main reason may depend on fighting the protection measure such as oxidation to adding the ration of fish oil to whether be adopted.
Engstre (1975) research discovers ration adds fish oil to be able to promote gallinaceous weightening finish, coronal to grow with sexual gland development, but the effect is not as good as corn oil; Edwards (1963) when reporting ration adds the fish oil of 4 ％ , gallinaceous growth is restrained. The ration that introduces in these experiments did not add antioxidant, the likelihood is destroyed because of PUFA by oxidisability and acid is defeated, through reducing chicken collect appetite and make gallinaceous growth is restrained (Fritsche; 1991) ; Fritsche (1988) defeated problem and its precautionary measures to undertake study to the acid of the fish oil in feed.
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