Uso de Mexilhão Dourado contaminado com metais tóxicos em dietas para frangos de corte

Abstract

This study aimed to evaluate the use of golden mussels contaminated with levels of Pb and Cd as a source of Ca replacing limestone in diets for broilers from 14 to 42 days and its effect on performance, blood parameters, digestibility metals and bone quality. two similar experiments were carried out where they were used 60 broilers, males 14-42 days of age were housed in cages of four Pb contamination levels (71.33; 147.55; 223.78 and 300.00 mg kg-1) or Cd (6.94; 14.55; 22.40 and 30.00 mg kg-1) and five replications. The golden mussel was added to the diet as a source of calcium in total replacement of limestone. At 42 days of age were weighed birds for performance evaluation and blood samples were collected for determination of serum parameters and after we carried out the slaughter and collection of tissues for analysis of concentrations of metals and collecting the bones to perform the evaluations of bone quality parameters. In the study of Pb can be seen that the increase in the Pb concentrations in the mussel increases the digestibility and metabolism of metal and causes an increase in production by the liver AST. Pb levels mussel above 214.11 mg kg-1 impair bone strength and flexibility. And experiment with Cd concentrations above 20 mg kg-1 of Cd from the golden mussel are sufficient to cause the maximum values of Cd contamination in animals. The use of concentrations of up to 22.40 mg kg-1 of Cd in the mussel flour for the pectoralis major muscle and 6.94 mg kg-1 in the case of liver provide Cd concentrations that can be used in human food, but for the other tissues evaluated the concentration of 6.94 mg kg-1 brings in Cd concentrations above the permitted. The increase in the concentrations of Cd causes increased production of bilirubin in bile, metabolism and increases the digestibility of Cd and serum concentrations of Ca. AST production by the liver and bone flexibility are increased by Cd levels mussel flour