Effects of stored whole rice bran treated with organic acids on the performance, nutrient digestibility, intestinal mucosa morphometry, and bone characteristics of broiler chickens

Abstract

This study evaluated the effects of feeding whole rice bran (WRB) stored for different times and treated with a mixture of organic acids on the growth performance, nutrient digestibility, duodenal morphometry, and bone characteristics of broiler chickens. Three hundred and twenty 1-d-old Cobb broilers were used in a 21 d experiment with a completely randomized design. Whole rice bran with five storage times (0, 30, 60, 90, and 120 d) was included at a 12% level in the diets, with eight replicates of eight birds each. A polynomial regression with a significance level of 5% was used. A reduction in daily weight gain was observed in birds fed WRB stored up to 90 d. A quadratic response was observed in the daily feed intake and average body weight of birds fed diets containing WRB treated with a mixture of organic acids and stored up to 90 d. There was a linear increase in the digestibility of crude protein with increased WRB storage time. Apparent metabolizable energy and apparent metabolizable energy corrected for nitrogen showed an increasing quadratic response for up to 60 d of WRB storage and treated with a mixture of organic acids. A quadratic response for the morphometry of intestinal crypts was found. The crypt depth increased as the birds were fed a diet containing WRB treated with a mixture of organic acids, stored up to 30 d and decreased with storage times. In conclusion, WRB treated with a mixture of acetic and propionic acids and stored up to 60 d may be safely added to broiler chicken diets.