Juvenile Scylla paramamosain with the average body weight of (0.042±0.002) g were fed seven isonitrogenous and isoenergetic experimental diets with different lipid levels for 3 weeks to investigate the effects of dietary lipid level on growth performance, body composition and digestive enzyme activities of juvenile Scylla paramamosain. Using fish oil and soybean oil (1:1) as the lipid source, the lipid level in the seven experimental diets was 1.93%, 3.95%, 6.35%, 8.14%, 10.54%, 12.30% and 14.22% (measured values), respectively. Each experimental diet had three replicates and each replicate had 100 juvenile Scylla paramamosain. The results showed as follows:1) dietary lipid level significantly affected the weight growth ratio (WGR) and specific growth ratio (SGR) of juvenile Scylla paramamosain (P<0.05). With the increase of dietary lipid level, the WGR and SGR of juvenile Scylla paramamosain were firstly increased and then decreased, and when the dietary lipid level was 8.14%, both WGR and SGR produced the maximum value. The quadratic curvilinear regression analysis showed the best dietary lipid level was 7.52% which could acquire the best WGR. The survival rate (SR) in the group with 14.22% dietary lipid level was the lowest, which was significantly lower than that in other groups (P<0.05). 2) Dietary lipid level had significant effects on body crude protein and ether extract contents in whole crab (P<0.05). The crude protein content in whole crab was firstly increased and then decreased, and when the dietary lipid level was 8.14%, it produced the maximum value. The ether extract contents in whole crab with the increase of dietary lipid level continued to increase, when dietary lipid level was 14.22%, it produced the maximum value. Dietary lipid level had no significant effects on the contents of moisture and ash in whole crab (P>0.05). 3) With the increase of dietary lipid level, the activities of protease, lipase and amylase of juvenile Scylla paramamosain were firstly increased and then decreased, and all of them produced the maximum value when the juvenile Scylla paramamosain fed with diet contained 8.14% lipid. In conclusion, taking WGR as the evaluation index, the suitable dietary lipid level for juvenile Scylla paramamosain should be 7.52%.
XU Mingzhu, ZHANG Qin, DONG Lanfang, XIE Da, SU Qiong, NIE Zhenping, YANG Jialin, TONG Tong
. Effects of Dietary Lipid Level on Growth Performance, Body Composition and Digestive Enzyme Activities of Juvenile Scylla paramamosain[J]. Chinese Journal of Animal Nutrition, 2017
, 29(3)
: 987
-994
.
DOI: 10.3969/j.issn.1006-267x.2017.03.032
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