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This study explored the impact of supplementation of L- carnitine on the performance of broiler chicken, biochemical parameters and expression of cationic amino acid transporter ( CAT2 ), myogenic determining factor ( MYOD ) and myogenic factor 5 ( MYF5 ) genes. This study included two groups; the first one is the control group and the second one received L-carnitine at a dose 50 mg/kg/day in drinking water. After 35 day, the sera and muscle tissue were obtained for biochemical and real time polymerase chain reaction (qPCR) analysis. The obtained results revealed a significant increase in the body weight, total body weight gain and a significant decrease in food consumption, food conversion rate in L-carnitine-supplemented group as compared to the control group. Moreover, there was no significant changes in serum cholesterol, triacylglycerol, AST, ALT, total protein and uric acid levels which showed a slight decrease in L-carnitine-supplemented group in comparison with the control group. This study also revealed a significant up regulation for the expression of CAT2 , MYOD and MYF5 genes in muscles of broiler chicken-supplemented with L- carnitine as compared to the control one. The present study concluded that supplementation of L- carnitine to broiler chicken was useful to increase the total body weight gain and muscle mass and this beneficial effect was associated with up regulation of CAT2 , MYOD , and MYF5 genes. Key words : L-carnitine; broiler chicken; growth traits; CAT2; MYOD; MYF5

The aim of current study was to determine the effect of dietary omega 3 fatty acids (FA) mainly eicosapentaenoic (EPA) and docosahexaenoic (DHA) on inflammatory response of post calving cows during transition to lactation. Twenty Holstein lactating cows were assigned into two groups (10 each). The two groups fed on the basal diet while one of them was supplemented with 70 g of omega-3 FA per cow. The supplement was added to the diet from the 1 ST day of calving till the 60 th days of lactation. Blood samples were taken 3 times weekly from the 2 nd to the 4 th week post calving. The blood samples were analyzed for glucose, insulin, non-esterified fatty acids (NEFA), beta hydroxyl butyric acid (BHBA), C- reactive protein (CRP), haptoglobin, albumin and globulin. Feeding omega-3 FAs significantly increased (P

The present study investigated the influence of altering omega 6 to omega 3 fatty acids (FA) ratio on growth, hemato- biochemical parameters and absorptive capacity of Nile tilapia. One hundred and fifty fingerlings (25.1±0.3 g), were assigned into 3 groups (5 replicates each) and fed on iso-caloric and iso-nitrogenous diets. Diets were supplemented with fish and soy oil to create 3 different ratio of omega 6 to omega 3 FA, namely, 0.91, 2.85 and 9.3 parts of omega 6 to 1 part of omega 3 (R1, R3 and R9, respectively). Increasing the ratio from R1 to R9 significantly decreased average daily gain and increased feed conversion ratio. Also this alteration decreased ash content in the carcass on the expense of ether extract. Number of erythrocytes, packed cell volume, hemoglobin concentration were significantly increased in fish fed R1. Feeding R9 increased heterophils and decreased lymphocytes as compared with R1 and R3. Fish fed R1 significantly had high serum protein and serum antibacterial activity (47.6%) than R9 (43.5%) and R3 (44.9%). Feeding R1 significantly decreased serum triglycerides, cholesterol and creatinine. Feeding R3 and R1 enhanced absorptive capacity of jejunum villi more than the group fed R9. Increasing the ratio of omega 6 to omega 3 FA from R1 to R9 decreased growth performance through decreasing absorptive capacity of jejunum villi. However, Feeding R3 had a positive effect on growth performance and absorptive capacity of the intestine of Nile tilapia. Key words : fish oil; growth performance; intestinal villi; Nile tilapia; soybean oil