Effects of yeast complex microecological preparation on growth performance,immune index and antioxidant capacity of common carp
The purpose of this experiment was to study the effects of yeast compound microecological preparation on growth performance,immune indexes and antioxidant capacity of carp,and to determine the appropriate dosage.A total of 540 carp with an initial body weight of(35±0.5)g were randomly divided into 6 groups with 3 replicates per group and 30 carp per replicate.The fish were pre-fed for 14 days.The basic diet was used as the CK group,and the experimental group was fed with feed containing 0.1‰,0.5‰,1‰,2‰ and 3‰ yeast complex probiotics.After 56 days of feeding,samples were collected and analyzed.The results showed that:(1)Compared with CK group,the growth performance of carp was significantly improved by adding yeast compound microecological preparation.The weight gain rate(WGR)in 2‰ and 3‰ groups was increased by 23.01%and 24.15%(P<0.05),and the specific growth rate(SGR)was increased by 13.79%and 14.37%(P<0.05).Feed ratio(FCR)was decreased by 18.09%and 18.59%(P<0.05).(2)Compared with CK group,adding yeast composite probiotics to the feed significantly improved the immune indicators of carp.The lysozyme(LSZ)of the 2‰and 3‰groups was increased by 47.9%and 48.74%(P<0.05),immunoglobulin M(IgM)was increased by 48.31%and 49.44%(P<0.05),complement C3(C3)was increased by 39.61%and 39.61%(P<0.05),and alkaline phosphatase(AKP)was increased by 17.05%and 17.44%(P<0.05).The total protein(TP)was increased by 31.03%and 30.38%(P<0.05).(3)Compared with CK group,the antioxidant capacity of carp was significantly increased by adding yeast compound microecological preparation.The total antioxidant capacity(T-AOC)in 2‰ and 3‰ groups was increased by 31.11%and 31.87%(P<0.05).Superoxide dismutase(SOD)was increased by 37.63%and 45.71%(P<0.05),catalase(CAT)was increased by 41.69%and 41.36%(P<0.05),and malondialdehyde(MDA)was decreased by 22.71%and 20.92%(P<0.05).In conclusion,the growth performance,serum immune indexes and liver antioxidant capacity of common carp could be significantly improved by adding yeast compound microecological preparations 2‰ and 3‰ in feed.Based on the fact that there was no significant difference between 2‰ and 3‰ supplementation groups,it was suggested that the optimal dosage of yeast compound microecological preparation was 2‰.
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