This study was conducted to investigate the effect of olive oil, blackseed oil and flaxseed oil on growth performance and serum biochemistry of broiler chicks. Three hundred broiler chicks were grouped into 30 experimental units having 10 chicks each. Three levels (0.5, 1.0 and 1.5%) of each of the oils were offered to the chicks such that each treatment was replicated thrice. The chicks fed on basal diet served as a control. The data on weekly body weight gain, feed intake, weekly feed conversion ratio, Newcastle Disease (ND) and IBD titers, serum triglycerides, serum cholesterol, low density lipoproteins and high density lipoproteins were recorded. Overall weight gain (1720.6 g) was significantly (P<0.05) highest in the treatment group having 0.5% flaxseed oil. Highest value of titer (213.33) against ND was observed in the treatment having blackseed oil 0.5%. Results of serum triglycerides, serum cholesterol, low and high density lipoproteins showed no effect of these treatments. Overall results depicted that 0.5% flaxseed oil improves growth performance in broiler chicks.
In the present study, the effect of various dietary ratios of linoleic acid (LNA) to α-linolenic acid (ALA), and vitamin A (Retinyl Acetate) on egg quality and some blood metabolites was examined in laying hens kept at high ambient environmental temperature. Three hundred and sixty laying hens were fed rations supplemented with different combinations of canola oil and linseed oil to have LNA to ALA dietary ratios of 20:1, 10:1, 4:1, 2:1, 1:1 and 1:2, each with 3000 IU or 10000 IU vitamin A/kg of diet (6×2 factorial; under Completely Randomized Design). Various blood metabolites, egg cholesterol, egg triglycerides and egg-yolk fatty acids were determined during the last week of the study. The results showed that serum triglycerides, serum total-and low density lipoprotein-cholesterol, and blood glucose were similar (P>0.05) in laying hens; fed on various dietary LNA/ALA ratios and vitamin A levels. Consequently, egg cholesterol and egg triglycerides were also similar (P>0.05) for the all dietary treatments. However, Serum high density lipoprotein-cholesterol increased (P=0.045) with the decrease in dietary LNA/ALA ratio. The n-3 polyunsaturated fatty acids (PUFA) in egg yolks from laying hens were increased (P<0.001) while, the n-6 PUFA and the ratio of n-6 to n-3 fatty acids were decreased (P<0.001) with the decrease in dietary LNA/ALA ratio. It was recommended that a dietary ratio of 4:1 or less between LNA and ALA was quite beneficial for the production of eggs by the hens with desirable quantities of n-6 and n-3 PUFA that are suitable for human consumption.
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