Effects Of Phytase And Different Calcium Sources On Calcium And Phosphorus Metabolism In Broilers

Objective: Adding phytase and different sources of calcium in broiler diets is todetect and analyse the effect of phytase on broiler performance, calcium andphosphorus utilization, for determing the best effect of calcium source with phytase onbroilers, reducing feed costs for production, providing a basis for optimizing feedformula of support.Methods: A total of320healthy AA chicks were randomly divided into4groups,8replicates per group and10chicks per replicate. There were4treatments in a2×2factorial design, including group1(limestone,0FTU/kg phytase), group2(limestone,1000FTU/kg phytase), groups3(celtic sea mineral,0FTU/kg phytase) and groups4(celtic sea mineral,1000FTU/kg phytase). The experiment lasted42days to study thegrowth performance, nutrient digestibility, tibia and blood mineral parameters.Results:1. Production performance: during the entire feeding test, daily weightgain (ADG) in group4increased by5.7%and2.5%(P0.05), compared with group1and3respectively; and FCR in group4improved by8.0%(P0.05) compared withgroup1; feed intake had no significant difference (P≥0.05). In1~21day, ADG ingroup increased by6.9%(P0.05),1.7%(P≥0.05)and2.0%(P≥0.05), and feed intake ingroup1was significantly higher than other groups (P0.05);22~42day age, ADG ingroup4was higher by5.0%and2.9%(P0.05) than group1and3, but feed intakewas no difference between groups (P≥0.05).2. Nutrient digestibility: in1~21day age, there were no significant difference inthe digestibility of crude ash, calcium, and phosphorus between group2and group4(P≥0.05), but they were significant higher (P0.05) than group1and group3;22~42day age, there were no significant difference in; the digestibility of crude ash, calcium,and phosphorus between group2and group4(P≥0.05), but they were significanthigher (P0.05) than group1and group3.3. Tibia parameter: on21day age, tibia heavy and tibia ashes in group4was 10.7%and3.4%heavier (P0.05) than that in group1, but tibia strength in all groupswas not significant (P≥0.05); on42day age, tibia heavy, tibia strength, and tibiaashes significantly improved in group1by5.7%,14.4%and5.9%(P0.05),compared to group1; and tibia strength and tibia ashes in group4improved by6.7%and5.6%(P0.05).4. Serum mineral: on21day age, calcium, phosphorus and zinc content in group4significantly improved by8.3%,12.5%and8.7%(P0.05), respectively, comparedto group1, but not significant (P≥0.05) when compared to group2and3; on42dayage, calcium, phosphorus, and zinc content in group4improved by8.3%,6.3%, and9.0%(P0.05), respectively, compared to group1, but not significant when comparedto group3(P≥0.05).Conclusion: The results suggest that the effect of the diet with celtic sea mineralas calcium source and phytase1000FTU/kg addition in group4is very ideal, which cansignificantly improve the growth performance, nutrient digestibility, tibia parameterand serum mineral content of broilers.