Effect of Feeding Nigella sativa L. Seeds to Layers on Serum lipids

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Rania Mohamed Hamed Ali, Ali
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This study was executed to investigate effect of dietary Nigella sativa seeds (black cumin) on the levels of serum various lipid fractions in laying hens. Sixty white leghorn laying hens. 68 weeks old were divided into three groups (A, B and C). The control group (A) was fed on pure commercial laying hen diet, while in group (B) and (C) it was replaced by 1 and 3% of black cumin seeds, respectively. The treatment continued for 3 months. Serum samples were collected every two weeks for determination of total lipids, total cholesterol phospholipids and triacylglycerols concentrations. The results revealed that feeding 1 and 3% of black cumin to laying hens resulted in significant reduction in the total lipids, total cholesterol, phospholipids and triacylglycerol compared to the control group. The decreasing effect was significant after 4 weeks of treatment in total lipids and total cholesterol in the two treated groups, but in phospholipids it decreased in week 8 in group B and in week 6 in group C, while the decrease in triacylglycerols was in week 4 in group B and in week 8 in group C. Triacylglcerols were the most affected lipid by the low dose (1%) of N. sativa, while phospholipids were the most affected by the high dose (3%) of N. sativa. The influence of time on the inclusion of 1 and 3% N. sativa to laying hens diet showed fluctuating manner during the course of the study in all lipid fractions, except total lipids, which in group B of 1% N. sativa resisted alteration by recording similar levels throughout the experimental period. In the last week, total lipids and phospholipids recorded higher levels whereas total cholesterol and triacylglycerols recorded lower levels compared to the first sample taken in week 2