Effect Of Oligosaccharides Chelated Trace Elements On Growth Performance,Trace Element Availability And Antioxidant Capacity Of Broilers

The aim of this experiment was to study the effects of different oligosaccharide chelated trace elements level on growth performance,trace element content and antioxidant properties in blood and liver of broilers.Six hundred healthy one-day-old AA commercial broilers were randomly divided into 6 treatments with 5 replicates for each treatment.Treatment 1 was inorganic trace elements?IE-100?.The inorganic trace elements premix?CuSO₄·5H₂O,ZnSO₄·H₂O,MnSO₄·H₂O,FeSO₄·H₂O,KIO₃,Na₂SeO₃?was used to supplement copper,zinc,manganese,iron,iodine and selenium with the content of 8,70,90,50,0.5 and 0.3 mg/kg in the diet,respectively.Treatment2,3,4 and 5 were organic composite trace elements,and the diets were IE-100 in which inorganic trace elements were replaced by oligosaccharide chelated trace element premix?oligosaccharide chelated Cu,Zn,Mn and Fe,KIO₃ and Na₂SeO₃?at the level of 100%?OE-100?,75%?OE-75?,50%?OE-50?and 25%?OE-25?,respectively.Treatment 6 was no additional trace elements?OE-0?.The experiment was divided to two stages?1-21 d and 22-42 d?.Weighing and slaughter experiments were conducted on 21 d and 42 d to determine the production performance,trace element content and antioxidant properties.Results showed that:1)OE-100 increased?P<0.05?ADG?1⁴2 d?,leg muscle rate?42 d?,apparent and true availability of Phe and Glu,and true availability of Lys,the iron?21 d?and Cu-Zn SOD?42 d?in serum and liver of broiler,and the content of liver MDA?42 d?decreased?P<0.05?,compared with IE-100.2)Compared with OE-0,the increased ADG?22-42 d and1-42 d?and decreased F/G?22-42 d and 1-42 d?of OE-75,increased half eviscerated ratio?21 d and 42 d?,breast muscle ratio?21 d and 42 d?,and leg muscle ratio?42 d?in IE-100,OE-100,and OE-75,the increased apparent and true availability of DM,OM,CP,and GE in OE-100 and OE-75,and the increased apparent and true availability of DM,OM,and CP in OE-50,the increased apparent and true availability of Lys,Met,Arg,Thr,Ser and Glu in IE-100,OE-100,OE-75,OE-50 and OE-25,His,Phe,Val,Asp,Gly and Cys in OE-100,and Asp and Gly in OE-75,the increased iron?21 d?,zinc and copper?42 d?in blood and liver of IE-100,OE-100,OE-75,OE-50and OE-25,the increased Cu-Zn SOD?21 d?and GSH-Px?42 d?activities and decreased MDA?42 d?content in serum and liver of IE-100,OE-100,OE-75 and OE-50 were observed?P<0.05?.3)With the decreasing of oligosaccharide chelated trace element,the ADG?1-21 d,1-42 d and 22-42 d?,21 d and 42 d semi-clearing rate,breast muscle rate and leg muscle rate and 42-day total rifling rate,apparent and true availability of DM,OM,CP,and GE,and amino acids?Lys,Met,Arg,His,Phe,Thr,Val,Asp,Ser,Glu,Gly,Cys,Pro,Tyr?,trace elements in blood[iron?21 d?,zinc and copper?21 d and 42 d?,and manganese?42 d?],trace elements in liver[iron and zinc?21 d and 42 d?,copper and manganese?42 d?],serum and liver Cu-Zn SOD and GSH-Px?21 d and 42 d?decreased linearly?P<0.05?,while F/G?22-42 d and 1-42 d?,the abdominal fat ratio?42 d?and the content of MDA in serum?21 d and 42 d?and liver?42 d?increased linearly?P<0.05?.In conclusion,the optimum levels of oligosaccharide chelated trace elements in improving broiler production performance,trace element availability,and serum and liver antioxidant capacity were 25%,50%and 75%,respectively,and the equivalent level of oligosaccharide chelated trace elements to inorganic trace elements according to comprehensive index are 50%-75%.