| 【Objective】The study was conducted to explore the differences in growth performance, conventional
nutrient composition and economic benefits of grass carp cultivated with different feed based on dike-pond agriculture.
【Methods】A comparative test on grass carp breeding among three groups, i.e. pupa peptide protein group(PP. Group), pupa
peptide protein feed and jean grass group(PP.+JG.Group), feed from WangHai corp.(WH. Group). 610 grass carps with the initial weight of 770(±11.2) g were selected for each group and were cultured in the test ponds of the same size(0.147 hm2) for
180 d. At the end of test period, 4 grass carps were randomly selected from each group, and dorsal muscle above the lateral line
were collected and made into 4 compound samples with a mass of 50(±3.8) g as 4 repeated samples in each group. In addition, the
dorsal muscle of 4 grass carps with the initial weight was randomly collected before the test to be made into compound samples as
the blank control group. 【Result】The results showed that the grass carps in PP. Group have the highest weight gain rate (134.3%),
and the crude fat content in muscle (1.74%) was significantly higher than that of other groups . From the two indicators of weight
gain rate and specific growth rate, there was an obvious difference among 3 groups: PP. Group >WH.Group>PP.+ JG. Group. The
crude protein content (20.7%) and delicious amino acid content (6.37%) of grass carps in PP.+JG.Group were the highest, while the
fat content was the lowest (1.27%), and the input-output ratio was the lowest (0.941). The unsaturated fatty acid content (71.07%) of
the initial group was significantly higher than that of three test groups (66.98%, 65.48%, 66.07%); while the oleic acid content(C18:1)
and total amino acid content in the muscle of grass carps in the three test groups were significantly higher than those in the initial
group, and there was no significant difference in the fish nutritional composition between PP. Group and WH.Group . 【Conclusion】
Grass carps fed with pupa peptide protein feed had a high rate of weight gain, but it was easy to cause body fat deposition. Grass
carps of PP.+JG.Group grew slowly, but the fish had the highest crude protein content (20.7%) and the lowest fat content (1.27%),
and higher delicious amino acid content. Raising grass carp with grass based on dike-pond agriculture in the idle areas can
effectively reduce the cost of feed and improve the fish quality . |
