| The objective of the current experiment was to study the stability of multivitamin coating and its application in broilers.Two experiments were carried out in this paper: 1)5% premix feed was prepared by using rice bran meal as carrier,the effects of coated vitamins and trace elements in the premix on the vitamin content and retention were studied.2)The biological utilization rate of vitamin coating on broilers was compared and explored in the feed experiment.The effects of vitamin coating on production performance,slaughter performance,vitamin reserve in liver and blood,antioxidant index and economic benefit of commercial broilers were determined.The comparision on the vitamin stability of the compound vitamin coating: 5% premixed feed(without adding vitamins and microelements)was prepared to meet the needs of calcium,phosphorus,vitamins,choline chloride and amino acids of broilers according to the nutritional standards of commercial broilers.Rice bran meal was used as the carrier.And the following treatments were performed in the 5% premixed feed: treatment 1,multi-vitamins(no coating)was supplemented;treatment 2,adding multi-vitamins(coating);treatment 3,on the basis of treatment 1(no coating)+complex trace elements;treatment 4,on the basis of treatment 2(coating)+complex trace elements.The complex trace elements among the treatemts meet the nutritional requestments of broilers.The effect of coating on the content of vitamin A,D and E is shown in Table 1-2.The results showed that: 1)1)On the 30 th day,the content of vitamin D in the coated vitamin group was significantly higher than that in the non-coated group(P <0.05),and the content of vitamin B1 tended to increase(0.05 < P < 0.10)by 2.3%,while the vitamin A,vitamin E,vitamin B2 and B6 contents among the treatments had no difference(P > 0.05).The contents of vitamin D and B1 in the group supplemented with trace elements were significantly lower than those in the group without trace elements(P < 0.05),while the vitamin A,vitamin E,vitamin B2 and vitamin B6 contents had no difference(P > 0.05).2)Onthe 60 th day,Vitamin A and E content was significantly enhanced in the coated vitamin group(P < 0.05),while no differences were observed on Vitamin D,B1,B2 and B6 contents(P >0.05).The relative values of vitamin D,B1 and B2 in the coated vitamin group were enhanced by 1.80%,1.70% and 1.40%.Meanwhile,the contents of vitamin D and E in the group added with trace elements were significantly lower than these in the group without trace elements(P< 0.05),while no differences were observed on the content of vitamin A,B1,B2 and B6(P >0.05).The relative value analysis showed that the content of vitamin A,B1,B2 and B6 decreased in varying degrees after adding trace elements.3)The retention rates of vitamins A,D,E,B1,B2 and B6 among the groups decreased with time prolonging,while the retention rates of coated vitamins A,D,E,B1,B2 and B6 at the 30 d and 60 d were significantly higher than those in the non-coated group(P < 0.05).The retention rates of vitamin A,D,E,B1,B2 and B6 of the premix feed at the 30 d and 60 d were significantly decreased(P < 0.05)after adding compound trace elements.It can be speculated that with the passage of time,the vitamin retention rate shows a decreasing trend,while its content,retention rate and stability can be improved after vitamin coating.However,the vitamin content,retention rate and the stability showed a decreasing trend after adding trace elements,.The comparision on bioavailability of multi-vitamin coating on broilers: one-day-old 280 commercial broilers were randomly divided into three treatments with 8 replicates per treatment and 10 broilers per replicate.Treatment 1: Control group,broiler routine diet without any vitamins;Treatment 2 and 3,300 g/t non-coated compound multivitamin or coated compound multivitamin were supplemented,respectively,on the basis of treatment 1.The results showed that: 1)Adding non-coated and coated multivitamins could significantly increase the average body weight,ADFI and ADG of broilers on 21 and 42 days(P < 0.05),significantly reduce F/G and mortality rate(P < 0.05),and European index is also enhanced(P< 0.05).Compared with the non-coated vitamin group,the dietary supplementation of coated vitamin could significantly increase the average body weight of broilers at 42 d(P < 0.05),ADG(P < 0.05)at 42 d and the whole stage(1-42 days),decrease the F/G(P < 0.05),and increase the European index(P < 0.05).2)Compared with the control group,the abdominal fat rate of the uncoated multi-vitamin group and the coated multi-vitamin group was much higher(P < 0.05).And there was no significant difference in other slaughter performance(P >0.05).Compared with the control group,the pectoral muscle rate of the uncoated multi-vitamin group and the coated multi-vitamin group increased by 4.18% and 2.53%,respectively.3)The levels of VA and VD3 in liver and blood of the two experimental groups at d 21 and 42 were significantly higher than those of the control group(P < 0.05);meanwhile,the levels of VA and VD3 in liver of the coated multi-vitamin group at 21 days were significantly higher than those of the non-coated multi-vitamin group(P < 0.05),and the levels of VD3 in blood at 21 days and 42 days were significantly higher than those of the non-coated multi-vitamin group(P < 0.05).4)T-SOD activity of 21 d and 42 d in the two experimental groups was significantly higher than that of the control group(P < 0.05),MDA content was significantly lower than that of the control group(P < 0.05).5)Compared with the control group,adding uncoated and coated vitamins could increase extra economic benefits by 3.05 yuan/broiler and 3.49 yuan/broiler respectively.Compared with uncoated vitamins group,adding coated vitamins could increase extra economic benefits by 0.29yuan/broiler.Therefore,dietary supplementation of multivitamins can significantly improve the production performance and slaughter performance of broilers,increase vitamin content in liver and blood,improve the antioxidant performance,and obtain better economic benefits.At the same time,coated multivitamins show better effect.In conclusion,multivitamin coating can significantly improve the stability of vitamins and the biological utilization rate of broilers. |
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