This experiment was conducted to investigate the effects of L-malic acid on growth performance, body composition, digestion and antioxidant capacity of triploid cucian carp (Carassius auratus). A total of 450 triploid cucian carp with an average body weight of (16.24±0.06) g were randomly divided into 6 groups with 3 replicates in each group and 25 fish in each replicate. The fish in the 6 groups were fed experimental diets supplemented with 0 (control group), 1, 2, 4, 8 and 16 g/kg of L-malic acid for 90 d, respectively. The results showed as follows: L-malic acid supplementation could significantly reduce the pH and acid-binding acidity of diets (P<0.05). L-malic acid supplementation could significantly increase the feed intake (FI) and weight gain rate (WGR) as well as reduce the feed conversation rate (FCR), and the best growth performance was found in the 4 g/kg group. When the supplemental level of L-malic acid was from 0 to 8 g/kg, the moisture content in whole body was gradually reduced, while the crude protein, crude lipid and ash contents were gradually increased, and those indices in the 4 and 8 g/kg groups had significant differences compared with the control group (P<0.05). The highest dietary protein retention ratio was found in the 4 g/kg group and the highest dietary lipid retention ratio and ash retention ratio were found in the 8 g/kg group, and had significant differences compared with the control group (P<0.05). The highest amylase activity in intestine was found in the 4 g/kg group and the highest activities of lipase, trypsin and Na+/K+-ATPase in intestine were found in the 8 g/kg group, and had significant differences compared with the control group (P<0.05). L-malic acid supplementation could significantly increase the activities of superoxide dismutase (SOD) and maltate dehydrogenase (MDH) and decrease maleic dialdehyde (MDA) content in liver; meanwhile, the best values of them were all found in the 4 g/kg group and had significant differences compared with the control group (P<0.05). In conclusion, supplementing appropriate amount of L-malic acid can promote the growth, reduce the FCR, increase the body nutrient deposition, and improve the digestion and antioxidant capacity of triploid cucian carp. The optimal supplemental level of L-malic acid in the triploid cucian carp diet is 4 to 8 g/kg.
JING Ting
,
LUO Li
,
BAI Fujin
,
QIAN Qian
,
SUN Yuxuan
,
SHI Yaqin
,
LI Zan
. Effects of L-Malic Acid on Growth Performance, Body Composition, Digestion and Antioxidant Capacity of Triploid Cucian Carp (Carassius auratus)[J]. Chinese Journal of Animal Nutrition, 2013
, 25(10)
: 2337
-2344
.
DOI: 10.3969/j.issn.1006-267x.2013.10.017
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