Study On The Effects Of Coated Trace Elements In Diet On Broiler Chicken

As an essential nutrient element in the animal body,trace elements play an important role in the normal growth,immune function,anti-oxidative stress and bone development of animals.At present,inorganic salt trace elements and organic salt trace elements are commonly used as feed additives.However,trace elements of inorganic salts are inherently unstable,have low utilization rates,and pollute the environment.The trace elements of organic salts can overcome the defects of low utilization rate of trace elements in inorganic salts,but the process is complicated,lacks targeted detection methods,and the cost is high,so there are many restrictions in actual production.The coating of trace elements into a trace element additive after specific coating technology can improve the product stability,mask the bad odor,control the product release rate in the digestive tract,and also improve the bioavailability.However,its application in broiler production is relatively rare.Therefore,this experiment was to study the effects of adding different forms of trace elements and different addition doses on the growth performance,serum trace element content,antioxidant capacity and serum biochemical index and the meat quality of broilers.The results of the present study may provide a theoretical basis for the rational application of trace elements in broiler production.The test used a 2×2 two-factor factorial design,two factors being trace elements and added doses.The trace elements were added in the form of coating and uncoated,and the addition doses were 300 mg/kg and 1000 mg/kg,respectively.A total of 576 broilers of similar age?0.75±0.03?and healthy 21-day-old AA broilers were randomly divided into 4groups,12 replicates in each group,12 chickens in each replicate,and group I was basal diet+300 mg./kg uncoated trace elements,test group II was based on diet+1000mg/kg uncoated trace elements,test group III was based on diet+300mg/kg coated trace elements,test group IV was based diet+1000mg/kg coated with trace elements.The results are as follows:1.Adding trace elements to the diet significantly increased the average daily gain of broiler chickens?P<0.01?,significantly reduced the feed-to-weight ratio of broilers?P<0.01?,and had no significant effect on the average feed intake of broilers?P<0.05?;the doses of addition had no significant effect on the growth performance of broilers?P>0.05?;2.The content of Fe and Zn in the serum of broilers supplemented with trace elements was significantly higher than that of uncoated trace elements?P<0.01?,and the content of Se was significantly higher than that of uncoated trace elements?P<0.05?.The addition amount of 1000mg/kg can significantly increase the content of Fe in serum?P<0.05?;3.From the perspective of the addition form,the addition of trace elements in the diet significantly increased the serum antioxidant index T-AOC,GSH-Px and SOD in the serum than in the uncoated form?P<0.01?.The addition of trace elements in the grain significantly reduced the MDA content of serum MDA and breast muscle of broiler chickens?P<0.01?.From the point of addition,1000mg/kg trace elements significantly reduced the content of MDA in breast muscle?P<0.05?,but have no significant effect on the antioxidant performance of broiler chickens?P>0.05?,but have certain effects on GSH-Px and MDA.Improvement trend?P=0.052?;4.According to the added form,the addition of trace elements in the diet significantly increased the serum TC and LPL activity?P<0.05?,significantly reduced the content of T₄?P<0.01?,and significantly reduced LDL-C.Activity?P<0.05?;from the addition dose,1000mg/kg trace elements significantly increased the content of LPL?P<0.01?,300mg/kg trace elements significantly reduced the content of T₄?P<0.05?;5.The addition form and dose of trace elements had no significant effects on the p H,shear force and drip loss rate of broilers?P>0.05?,but these indexes in the group of trace elements were lower than those in the group of uncoated trace elements.6.There was a significant interaction between the trace form and the added dose on T₄ in the serum of broiler chickens?P<0.05?,and the content of Fe in serum showed a certain interaction trend?P=0.052?.Considering the test results and production cost,it is recommended that the appropriate use of trace element additives in broiler diets is to add 300mg/kg of coated trace elements,which can significantly improve the growth performance,serum trace element content and antioxidant performance of broiler chickens.Regulating serum biochemical indicators can improve the quality of meat and at the same time save the amount of trace elements.