Effect of Different Levels of Sunflower Meal and Niacin on Performance, Biochemical Parameters, Antioxidant Status, and Egg Yolk Cholesterol of Laying Hens
الموضوعات :پ. باغبان-کنعانی 1 , ح. جانمحمدی 2 , ع.ر. استادرحیمی 3
1 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
2 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
3 - Nutrition Research Center, Tabriz University of Medical Science, Tabriz, Iran
الکلمات المفتاحية: performance, sunflower meal, laying hens, niacin, shell thickness,
ملخص المقالة :
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 groupsof 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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