An 8-week feeding trial was conducted to evaluate the utilization effects of crystalline amino acids for juvenile yellowcheek carp (Elopichthys bambusa), and to determine the dietary lysine requirement. Seven isonitrogenous diets were formulated. The diet which had conjugated proteins (fish meal and casein) as the only protein source was control group diet. In the diets of experimental groups, crystalline amino acids were used to replace part of casein on the basis of the control group diet, and different levels of L-lysine稨Cl were supplemented into the above diets to achieve lysine levels from 1.9% to 4.5% with a 0.5% increment. A total of 378 juvenile yellowcheek carp with initial body weight of (2.36?0.08) g were randomly divided into 7 groups with 3 replicates per group and 18 fish per replicate, and each group were randomly fed one of the 7 experimental diets. The results showed as follows: although growth performance appeared different degrees of decline when part of casein replaced by crystalline amino acids, the special gain rate of 3.46% and 3.94% groups had no significant difference compared with the control group (P<0.05), and feed conversation ratio of 2.45%, 2.95%, 3.46% and 3.94% groups had no significant difference compared with the control group (P<0.05). The apparent digestibility of dry matter, protein and lipid of experimental groups were significantly higher than those of control group (P>0.05). The weight gain rate, special gain rate, apparent digestibility of dry matter and protein, hepatopancreas lipase activity, serum protein and cholesterol contents, and serum alkaline phosphatase activity of juvenile yellowcheek carp had a trend first increased and then decreased with increasing dietary lysine level. It is concluded that crystalline amino acids can be used by juvenile yellowcheek carp, and the utilization effects are related to the balance of amino acid composition. Using weight gain rate as index, quadratic curve model indicate that the optimal dietary lysine requirement for juvenile yellowcheek carp is 3.40% (DM basis) when dietary crude protein content is 46% (DM basis).
YANG Wei
,
FAN Qixue
,
ZONG Kejin
,
SONG Lin
,
ZHANG Yunlong
,
PENG Cong
,
HU Peipei
. Utilization Effects of Crystalline Amino Acids and Requirement of Lysine for Juvenile Yellowcheek Carp (Elopichthys bambusa)[J]. Chinese Journal of Animal Nutrition, 2012
, 24(7)
: 1255
-1263
.
DOI: 10.3969/j.issn.1006-267x.2012.07.010
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