White striping e wooden breast: mitigação das miopatias com uso de compostos polifenólicos

Abstract

The objective of this study was to evaluate the use of bioactive compounds (polyphenols) in the diet of broilers and their effects on the incidence of White striping and Wooden breast pectoral myopathies, evaluating the macroscopic scores, muscle histomorphometry and their impacts on meat quality. The experiment was carried out in an experimental aviary located in the Poultry sector at the Faculty of Agricultural Sciences of the Federal University of Grande Dourados. 1280 one-day-old male chicks of the Ross TM4® strain were housed. The birds were distributed in a completely randomized design in four treatments with the inclusion of bioactive extracts at four levels: Control, 250 g/ton, 500 g/ton, 1,000 g/ton, with eight replications, totaling 32 boxes, with 40 birds each. The experimental diet was provided ad libitum, based on corn and soybean meal, according to the production phase, with isoprotein and isoenergetic diets. Slaughter was carried out at 21 and 42 days of age to evaluate meat quality parameters, as well as the incidence of pectoral myopathies (White striping and Wooden breast). In addition, pectoralis major muscle fragments were collected from one bird per repetition for histomorphometric analysis. The use of the bioactive extract rich in polyphenols had a positive influence on the development of Wooden breast myopathy, since the birds that were fed with different levels of inclusion of the product had an incidence of less severe degrees of myopathies. In addition, the polyphenol contributed to the tenderness of the meat of broilers, improving the shear force at 21 and 42 days and decreasing the loss of water during the cooking process.