چاپ صفحه |  صفحه نخست سامانه |  چکیده مقاله |  نویسندگان |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| This study was conducted to evaluate the effect of different levels of sunflower meal (SFM) and niacin on laying hens performances, biochemical parameters, antioxidant status, and egg yolk cholesterol concentration. A total of 960, White Leghorn (Hy-Line W-36) commercial layers were randomly assigned to 12 groups of 8 replicates with 10 hens each. Hens were allocated to diets 1 through 12 in a 3 × 4 factorial design and the dietary treatments included 3 levels of SFM (0, 10 and 15%) and 4 levels of niacin (0, 175, 225 and 275 mg/kg) fed to the birds for 10 weeks. Feed consumption was not affected (P>0.05) by niacin, SFM and SFM × niacin interaction. Dietary supplementation of 15% of SFM significantly (P<0.05) reduced egg weight, egg production and consequently egg mass. However, dietary addition of 275 mg of niacin/kg of diet increased (P<0.05) egg production and egg mass. Egg weight was not affected (P>0.05) by dietary addition of niacin. Feed conversion ratio was affected (P<0.05) by dietary addition of SFM and was not affected (P>0.05) by dietary incorporation of niacin and the SFM × niacin interaction. In fact, dietary supplementation of 15% of SFM significantly increased (P<0.05) FCR from 2.12 to 2.14. With the exception of shell thickness, all other parameters were not affected (P>0.05) by dietary addition of niacin. Dietary supplementation of 15% of SFM reduced (P<0.05) egg shell thickness from 0.29 to 0.28. However, only egg shell strength was affected (P<0.05) by dietary incorporation 275 mg of niacin/ kg of diet. Egg yolk cholesterol content was affected (P<0.05) by dietary addition of SFM and niacin. Our data also showed that serum concentration of aspartate aminotransferase (AST), alanine aminotransferase (ALT) and triglycerides (TG) levels were not affected (P>0.05) by dietary incorporation of SFM, niacin, and their interaction. By contrast serum concentration of total cholesterol (TC) were affected (P<0.05) by dietary addition of SFM, niacin and their interaction. There were no effects (P>0.05) of the experimental diets on total antioxidant capacity (T-AOC), total superoxide dismutase (TSOD), glutathione peroxidase (GSH-Px) and malondialdehyde (MDA) serum concentration. |
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| علیرضا استاد رحیمی | سوم |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
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| Niasin.pdf | 1399/05/28 | 271202 | دانلود |
