effect of different levels of dietary niacin on the gut and liver histology and some liver enzymes activity of juveniles common carp (cyprinus carpio)

نویسندگان

خیری محمدی1

1. کارشناسی ارشد رشته تکثیر و پرورش، گروه شیلات، دانشکده منابع طبیعی دریا، دانشگاه علوم فنون دریایی خرمشهر، خرمشهر، ایران حمید محمدی آذرم2

2. استادیار گروه شیلات، دانشکده منابع طبیعی دریا، دانشگاه علوم فنون دریایی خرمشهر، خرمشهر، ایران امیر پرویز سلاطی2

2. استادیار گروه شیلات، دانشکده منابع طبیعی دریا، دانشگاه علوم فنون دریایی خرمشهر، خرمشهر، ایران ابراهیم رجب زاده قطرمی2

2. استادیار گروه شیلات، دانشکده منابع طبیعی دریا، دانشگاه علوم فنون دریایی خرمشهر، خرمشهر، ایران

چکیده

this experiment was conducted to examine effects of different levels of niacin on the gut and liver histology and also some activity of the liver enzymes in the blood serum of common carp. a control diet (containing 30 mg niacin kg-1 commercial diet) and four other diets were prepared which had 50, 70, 90 and 110 mg niacin per kg of commercial diet, added by spraying. fish with initial average weight of 35 g were allocated to 15 circular 300-l tanks at a density of 12 fish per tank and fed the experimental diets to satiation three times a day for 50 days. the result showed that, the activity of the liver enzymes containing alanine aminotransferase and aspartate aminotransferase decreased with increase of niacin but it was not significantly different (p > 0.05). also, the increase of niacin induced a significant increase (p < 0.05) in epithelial length of intestine, with the highest value was found in the treatment 90 mg niacin kg-1 diet (1280.10 ± 40.93 micrometer), compared with that of the control (308.98 ± 32.42 micrometer). on the other hand, epithelial thickness of intestine decreased sig­nificantly (p < 0.05), that the lowest value was in treatment of 90 mg niacin kg-1 diet (49.49 ± 1.05 micrometer), compared with  that of the control (111.27 ± 2.79 micrometer). based on this study, lipid vacuole decreased in anterior intestine and liver by different levels of niacin. according to these results, addition of 90 mg niacin kg-1 diet is recommended for juveniles of common carp.

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عنوان ژورنال:
شیلات

جلد ۶۹، شماره ۲، صفحات ۲۵۳-۲۶۳

کلمات کلیدی
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