Effects Of The Different Sources And Levels Of Diet Manganese On Growth Performance And Immune Functions And Metabolism Of Nutrients In Broiler

A basal corn-soybean meal diet (contained 37.66mg/kg Mn) was treated by different Mn sources including inorganic Mn source ( MnSO4?H2O, contained 18.78% Mn ) and organic Mn source (organic chelated Mn supplied from Chengdu Aili Bio-technology institute, contained 10% Mn), by different Mn levels including adding 0,45,90,130 ,180 mg/kg respectively. Broilers were used in a treatment of 2×5 factorial arrangements to study the effect of different Mn sources and levels on growth performance, immune functions, biological availability of Manganese, regulation of tissue uptake of Mn and metabolism of nutrients of broiler chicks. The results were showed as follows: 1. A basal corn-soybean diet containing Mn 37.66mg/kg or 217.66mg/kg was referred to as marginally deficient or excess in Mn in broilers respectively. The recommended level of Mn added to the diet was kept at 45-130mg/kg and 45mg/kg was the best, no matter Mn sources. 2. Broilers fed corn-soybean diet can attain good immunity, so diet Mn cannot be ignored. 3. Mn added to the diet containing Mn 37.66mg/kg at levels of 45-90mg/kg can significantly increase retained energy and N and decreased when Mn added to 180mg/kg. There were no remarkable effects on the metabolism and deposition of Fe,Cu,Zn,Ca,P when dietary Mn changed from 37.66-217.66mg/kg. 4. The retention of Mn would increase significantly with levels of dietary Mn, but Mn retention rate would decrease significantly with levels of dietary Mn (P﹤0.01). Mn retention rate changed from 1.91%to 2.74%. 5. The organic chelated Mn compared with MnSO4?H2O could increase broilers growth performance significantly, improved retained energy and N and metabolism of other minerals of broilers slightly, but had no effect on the immune function of broilers. 6. Mn concentration in tibia, liver and kidney can be used to monitor nutritive status of broilers, and tibia was the most sensitive. Tibia Mn accumulation of 21-day old broilers appeared to be excellent indicator of relative biological availability. The relative biological availability of the organic chelated Mn used in the experiment was higher than feed-grade MnSO4?H2O.