| Pure lines, parents, commercial breeds of Gushi chicken, Ross roosters and Alvin broiler chicken were raised to 4 weeks old, and then they were divided into captive caged and free-range groups respectively until they were reared to 18 weeks. Detecting the basic Chemical composition and the main flavor of precursor substances in muscles of each group and analyzing the varieties and farming methods' impact on the succulent flavor. In view of fatty acids and phospholipids' important role in the meat flavor formation, we have detected their content and the composition of fatty acid in the muscles. We also extracted the intramuscular fat of Gushi chicken in CM liquid way, and separated the intramuscular fat into All neutral lipids, free fatty acids and phosphor-lipids three parts, then a precise quantitative was done for their Fatty acid composition further. The results are as follows:1. Under the conditions of release, Alvin Chicken's moisture content is higher than Pure lines and the crude protein content is less than Pure lines, some achieve significant levels (P<0.05), the whole intramuscular fat was not obvious, but the trend is that Alvin is higher than Pure lines. The moisture content of Ross roosters is equal to Alvin Chicken, but higher than Pure lines; the crude protein content of leg muscle is less than Gushi chicken and higher in breast than Gushi chicken, and the intramuscular fat content is similar to Alvin. Captive conditions, the varieties influence on the basic elements of hen breast but the law is not obvious and have no effect on leg muscle, In Captivity rooster, the varieties have no impact on the breast and leg muscle in the basic chemical constituents, the Roman egg rooster'crude protein and intramuscular fat content are equal to Pure lines.2. The species has a significant impact on the lipid components in the hen, and same with breast and leg muscle. Alvin triglyceride levels is significantly higher than that of Pure lines (P<0.05), free fatty acids and lecithin content is significantly lower than Pure lines (P<0.05). Varieties' impact on that of the rooster is allow the law in the hen except for the triglyceride in breast and the lecithin in leg; Ross rooster's All neutral lipids in the breast and leg muscle are both higher, the content of the phospholipids and Free fatty acids is between Avian and Pure lines. The species has an impact on the captive cage's lipid components in muscle . Pure lines products' All neutral lipids were significantly lower than the pure line and the parents (P<0.05), the phospholipids was significantly higher than pure lines and the parents (P<0.05); the law of free fatty acids was not obvious. The Ross phospholipid is both higher in breast and leg muscle, free fatty acid content in leg is in the minimum.3. The variety also has an impact on free fatty acid content in chicken. As for free-range chicken, the free fatty acids total quantity, the saturated fatty acid total quantity, the unsaturated fatty acid total quantity, C18:1, C18:2 and C18:3 in the cushion chicken's content is lower than the Gushi chicken obviously except that in the breast of the cock. Regarding the cage Raised chickens, all of that display higher in Gushi chicken commodity generation than the Gushi chicken parents generation, the Roman egg cockerel' content is in the two.4. Variety has an impact on free amino acids. In the total amount of free amino acids, aspartic acid, glutei acid, threnodies, galantine, in addition to the hen leg muscle, the trend of the restocking of Gushi chickens are higher than the Avian and Roman egg rooster. As for cage Raised chickens,, in addition to rooster breast, the other three groups are all lower in Pure lines, the Roman eggs rooster is also higher.5. Rearing methods have effect on basic chemical composition of varieties chicken. its rule is different because of the variety. The moisture and the crude protein content of pure lines display higher in the cage Raised group than in the free-range group. However, the intramuscular fat content is lower than the free-range group. The moisture content of the Gushi chicken parents generation display higher in the cage Raised group than in free-range group, or two groups' differences are not remarkable; the crude protein content of the cage Raised group is lower than the free-range group or there is no difference; The change of the intramuscular fat content has disorder and has no effect on cocks. The moisture content of the Gushi chicken commodity generation is higher in the free-range group except the leg muscle or the same to the cage Raised group; the intramuscular fat is higher in the free-range group. The raising way to the Roman egg cockerel muscle's basic chemical composition's influence is that: the moisture,the intramuscular fat of the breast and the intramuscular fat of the leg muscle are higher in the free-range group. And do not have remarkable influence to others. 6. Rearing methods have no impact for the variety of hen leg muscle in the chest from intramuscular fat composition of influential individuals. The free fatty acids and phospholipids contents in pure lines are lower in the free-range group except in the breast. In the Gushi chicken parents generation, the free fatty acids content is higher in the free-range group except the leg muscle of cocks; the trend of phospholipids contents is similar to the free fatty acid besides the female chicken leg muscle.7. The raising way is influential to the chicken free fatty acids content, but the influence is different because of variety, sex and spot. Generally speaking, regarding to the Gushi chicken pure line, the way of free-range to be more advantageous to its free fatty acids formation, but the way raised in cages is more advantage to Roman cockerel's free fatty acids formation. From the results we find that the law above is not remarkable accompany with the bringing in the extra blood. However, in the Gushi chicken commodity generation, the law is equal to the Ross roosters.8. The raising way is influential to the chicken free amino acid content. The total amount of free amino acids, aspartic acid, glutei acid, threnodies, almandine of the breast are lower in the free-range group both in Pure lines hen parents generation and commodity generation; the rooster breast display higher in the free-range group except in Pure lines .the leg muscle is lower in the captive caged group.
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