الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
 |  | from | 97 |  |  |
| | | from | 97 | | |
Abstract
The objectives of the current study are to investigate the effects of n-3 PUFA and green tea on rabbits’ performance, carcass characteristics, blood biochemical and analysis of total antioxidant capacity, superoxide’s dismutase and glutathione peroxides’ in blood and meat. And, also the possibility of having omega-3 enriched rabbit meat under the Egyptian condition.
A total number of 60 male growing California rabbits at 4 weeks of age and averaged 530 g body weight distributed into four experimental groups (n=15).
First group kept as control, second group fed experimental diet with 2% linseed oil, third group fed experimental diet with 2% linseed oil plus 0.5% green tea and the fourth group received the experimental diet with only 0.5% green tea.
The main results at the present study could be summarized as follows:
1. Results for fatty acid profile of linseed oil indicate that the percentage of total saturated fatty acids of linseed oil was 14.74 %, while the total unsaturated fatty acid was 85.26 %. However, the mono and the poly unsaturated fatty acids percentage were 24.76 and 60.5% respectively.
2. Total daily feed intakes were significantly lower in linseed oil and green tea treatment than those of control and rabbits which fed mixture of linseed oil and green tea
3. Meat fatty acids composition of California rabbits muscles affected by introducing linseed oil in the diets.
4. Significant differences in feed conversion ratio (FCR) were detected among the tested diets. The best value was recorded for the rabbit fed diet with linseed oil 2% while the worse feed conversion ratio was recorded for control group. Both of linseed oil and green tea decreased feed intake significantly as compared to the control. The reduction in feed intake resulted in better feed conversion values as compared to the control.
5. There was significant effect of 2% linseed oil, 2% linseed oil + 0.5% green tea and 0.5% green tea supplementation on digestibility of EE, CF, and NFE, and the nutritive values of TDN. But there was no significant effect of treatments on digestibility of CP. All treatments improved significantly apparent digestibility of ether extract compared with control group. All the dietary treatment decreased significantly the lipid oxidation in muscles compared to that of the control group. Also, 2% linseed oil and 2% linseed oil + 0.5% green tea supplementation declined non-significantly apparent digestibility of crude fiber compared to the control.
6. Data concerning the effect of feeding California rabbits on diets containing 2% linseed oil or 0.5% green tea or 2% linseed oil plus 0.5% green tea on their carcass characteristics are shown in Tables 5. The percentages weight of carcass traits were significantly affected by different treatments. It is obvious that rabbits fed control diet and 2% linseed oil had higher (P<0.01) carcass percentage than other treated groups.
7. Addition of linseed oil and linseed oil plus green tea significantly increased the linoleic (C18:2 n-6) and α-linolenic acid (C18:3 n-3) and decreased the saturated fatty acid (SFA) proportion in the muscle compared to the rabbits fed 0.05% green tea and control diet. After 2 months of deep frozen storage, the oxidative stability of meat samples was measured by thiobarbituric acid (TBARS). The results of the current study indicated that supplementing the diets with 2% linseed oil, 2% linseed oil plus 0.5%green tea and 0.5% green tea increased the oxidation of the rabbit meat compared to that of the control group Total antioxidant capacity (TAC) value insignificantly increased in all treatments comparing to the control group. Some interesting results indicate that some oils have antioxidive properties against lipid oxidation, besides their already established prooxidant action.
8. High density lipoprotein cholesterol (HDL) values were significantly (P< 0.05) increased by supplementing 2% linseed oil and 2% linseed oil plus 0.5% green tea followed by 0.5% green tea compared to control group. On the other hand, low-density lipoprotein cholesterol (LDL) values were not significantly affected by any of dietary treatments. Very low density lipoproteins (VLDL) were significantly decreased in rabbits fed 2% linseed oil and / or 0.5% green tea diets relative to control diet. Triglycerides (mg/dl) levels were significantly decreased in rabbits fed 2% linseed oil and / or 0.5% green tea diets relative to control diet but highly significant in that diet supplemented with 0.5% green tea compared with all groups.
In conclusion, these results may indicate dietary supplementation of linseed oil at 2% in the rabbit diets have a favorable effect on the quality of the produced meat in the term of higher content of n-3 fatty acids and low level of lipid oxidation. Addition of green tea may have extra protective effect according to its contents of natural antioxidants.