This study aimed to evaluate the consequences of replacing growth promoter antibiotics by organic acids in diets of broilers. A completely randomized design was utilized, with 5 treatments (T1: negative control without antibiotics or organic acids; T2: latic, propionic and formic acids; T3: fumaric, formic, propionic and sorbic acids; T4:  lactic, formic, fumaric and citric acids; T5: positive control, addition of antibiotic) and 7 replicates of 8 birds per experimental units. To evaluate de performance, the weight and feed intake were measured at different stages (1-21; 21-35; 35-42 day old). At 42 day old, 2 birds per pen were sacrificed with human methods to evaluate carcass yield, breast yield and leg yield. The results showed that organic acids have no influence on carcass yield and cuts. The performance should be better evaluated, because the experimental conditions don’t offer an enough environmental challenge for the additives (antibiotics and organic acids) can show their potential.

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Turnover do carbono em sangue e plasma, nas fases crescimento e postura, de codornas japonesas (Coturnix coturnix japonica)

The objective of this work was to detect the inclusion of animal meal in Japanese quail (Coturnix coturnix japonica) diets, by analyzing eggs and their fractions (albumen and yolk) through the technique of carbon (13C/12C) and nitrogen (15N/14N) stable isotopes. Four hundred and thirty-two Japanese quails, 45-day-old females, were distributed in a completely randomized experimental design, in eight treatments: T1, strictly vegetable diet (VEG), with corn (Zea mays) and soybean (Glycine max) meal; T2, bovine meat and bone meal (BM); T3, poultry viscera meal (OM); T4, feather meal (FM); T5, BM+OM; T6, BM+FM; T7, OM+FM; and T8, BM+OM+FM. Sixteen eggs were randomly collected from each treatment - eight for whole egg analysis and eight for separate yolk and albumen analyses. To determine the turnover rate, the exponential isotope dilution model was used. The application of C and N stable isotopes allows identifying the use of animal meal in coded diets through the analysis of whole eggs and their fractions, which suggests that this technique is a promising tool for the traceability and certification of products of animal origin.

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