Journal
JOURNAL OF ANIMAL SCIENCE AND BIOTECHNOLOGY
Volume 6, Issue -, Pages -Publisher
BIOMED CENTRAL LTD
DOI: 10.1186/s40104-015-0032-1
Keywords
Antioxidant status; Grass carp; Intestinal enzyme activity; Threonine
Categories
Funding
- National 973 Project of China [2014CB138600]
- National Department Public Benefit Research Foundation (Agriculture) of China [201003020]
- Science and Technology Support Programme of Sichuan Province of China [2014NZ0003]
- Major Scientific and Technological Achievement Transformation Project of Sichuan Province of China [2012NC0007, 2013NC0045]
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Background: This study was carried out to investigate effects of threonine levels on growth, digestive and absorptive capacity and antioxidant status in intestine and hepatopancreas of sub-adult grass carp (Ctenopharyngodonidella). Results: Weight gain, specific growth rate, feed intake and feed efficiency were significantly improved by dietary threonine (P < 0.05). Intestinal activities of trypsin, chymotrypsin, alpha-amylase, lipase, alkaline phosphatase, gamma-glutamyl transpeptidase and creatine kinase took the similar trends. Contents of malondialdehyde and protein carbonyl in intestine and hepatopancreas were significantly decreased by dietary optimal threonine supplementation (P < 0.05). Anti-superoxide anion capacity, anti-hydroxyl radical capacity, glutathione content and activities of superoxide dismutase, catalase and glutathione-S-transferase in intestine and hepatopancreas were enhanced by dietary threonine (P < 0.05). Conclusions: Dietary threonine could improve growth, enhance digestive and absorptive capacity and antioxidant status in intestine and hepatopancreas of sub-adult grass carp. The dietary threonine requirement of sub-adult grass carp (441.9-1,013.4 g) based on weight gain was 11.6 g/kg diet or 41.5 g/kg of dietary protein by quadratic regression analysis.
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