Comparison of bioavailability of manganese glycinate and sulfate and their effects on laying hens performance

The experiment was conducted to investigate the bioavailability of manganese glycinate and sulfate and its effects on yield and quality of eggs produced in commercial laying hens. 300 Leghorn laying hens (w36) with 66 weeks of age were divided into 6 treatments and 5 replications in a completely randomized design. Treatments include control (without manganese supplementation), treatments containing manganese sulfate (S), internal manganese glycinate at 30 mg level (M30), internal manganese glycinate at 90 mg level (M90) external manganese glycinate at 30 mg level (B30) External manganese glycinate at the level of 90 mg (B90). The results showed that there was a significant increase in feed intake, egg production, egg mass and feed conversion ratio in treatments receiving manganese supplementation increased significantly compared to the control treatment (P<0.05). Egg weight in diets containing manganese supplementation was significantly increased compared to the control treatment (P<0.05). No significant difference in egg quality traits was observed between experimental treatments. Tibia manganese was significantly increased in diets containing manganese supplementation compared to basal diet (P<0.05). Manganese sulfate and glycinate significantly increased the concentration of manganese in yolk, egg shell, serum and liver (P<0.05). Addition of manganese sulfate and glycine to the diet caused more manganese uptake and improved production performance and manganese storage in different body tissues of laying hens.