Effects of Vitamin D Addition Levels on Growth Performance, Body Composition and Serum Biochemical Parameters of Mid-Term Tilapia

Authors:Shengyun Meng, Brown Young

Abstract


Twenty hundred and seventy tails of tilapia with an initial body weight of (78.58±1.93) g were randomly divided into 6 groups (3 replicates in each group, 15 fish per replicate), and the levels of vitamin D were respectively fed. 0 (control group), 200, 400, 800, 1600, 3200 IU / kg of 6 kinds of feed (crude protein, crude fat content of 30% and 7.6%, respectively), after 12 weeks of feeding, through Growth performance, body composition, and serum biochemical indicators were determined to determine the appropriate level of vitamin D in the mid-term development of the tilapia feed. The results showed that the weight gain rate of each vitamin D-added group was significantly higher than that of the control group (P<0.05), and the feed efficiency of 200, 400, 800, 1600 IU / kg group was significantly higher than that of the control group (P<0.05). There was no significant difference in water and crude protein content between the two groups (P>0.05). With the increase of dietary vitamin D, the crude fat content of whole fish increased first and then decreased, reaching 200 IU/kg group. The highest, significantly higher than the other 5 groups (P <0.05); the total ash content of whole fish in each vitamin D addition group was significantly higher than the control group (P <0.05), but there was no significant difference between the vitamin D added groups. Difference (P>0.05). With the increase of the level of vitamin D in the feed, the activity of alkaline phosphatase in serum increased first and then decreased, and the group of 200, 400, 800 IU / kg was significantly higher than the control group (P<0.05); total cholesterol in serum, total Both protein and albumin levels reached a maximum in the 200 IU/kg group and were significantly higher than the control group (P < 0.05). It can be concluded that the proper addition of vitamin D in the feed can promote the growth of the mid-term tilapia. Excessive vitamin D addition may cause liver damage and affect fat metabolism.


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