کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8493250 | 1552797 | 2018 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of marker particle size on nutrient digestibility measurements and particle movement through the digestive system of shrimp
ترجمه فارسی عنوان
تأثیر اندازه ذرات نشانگر بر اندازه گیری هضم مواد مغذی و حرکت ذرات از طریق سیستم گوارش میگو
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
استفاده از مواد مغذی میگو، هضم نانوذرات، از دست دادن مداوم
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
چکیده انگلیسی
A range of inert digestibility markers, such as yttrium(Y) and ytterbium (Yb) oxides, are used to indirectly calculate the digestibility of nutrients in aquafeeds. Gross over-estimations of nutrient digestibility can be encountered if several assumptions are not met, including that nutrients move through the digestive system at the same rate as the markers. The present study sought to assess the effect of particle size on apparent nutrient digestibility, and traced the movement of several inert metal markers (Y, Yb and gold) of various sizes (>3â¯Î¼m, 400â¯nm, 100â¯nm, 50â¯nm and 5â¯nm) through the shrimp digestive tract. The first of two experiments assessed the effect of particle size on nutrient digestibility using traditional faecal collection methods, while the second traced particle movement within the stomach, hepatopancreas and intestine at various times (1, 2, 3, 5, 10 and 18â¯h) after a set ration. This work showed that particle size had a significant effect on nutrient digestibility, and that 50â¯nm and 5â¯nm gold particles had relative particle retention coefficients of 37.3â¯Â±â¯2.7% and 48.9â¯Â±â¯1.8%, respectively. Gold particles were detected in the hepatopancreas of animals fed 5â¯nm gold for >18â¯h, indicating that small particles remain within the animal for long periods of time. This is despite that the shrimp digestion was extremely rapid, with evacuation rate of the digestive tract calculated at 22.1% hâ1. Large Y and Yb particles (>3â¯Î¼m) found within the animal 1-hour after feeding showed that the amount of true feed intake was lower than measured feed intake by 15-25%, and provided an estimate of manipulative losses during feeding. Overall, this study showed that the shrimp filter press was highly efficient at excluding small indigestible particles, to below 400â¯nm, and that extremely high rates of nutrient digestion were maintained despite rapid movement through the digestive system. This work may in part account for the disparity between high levels of apparent nutrient digestibility and low nutrient utilisation efficiency measured in shrimp.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquaculture - Volume 491, 1 April 2018, Pages 273-280
Journal: Aquaculture - Volume 491, 1 April 2018, Pages 273-280
نویسندگان
N.M. Wade, N. Bourne, C.J. Simon,