Probiotic and antibiotics on swine feeding during nursery phase

Abstract

The purpose of the experiment was to evaluate the use of two probiotic doses compared with diets formulated with two antibiotics principles (tylosin and doxicycline+gentamicin) supplied to swines during nursery phase (ages of 21 to 63 days). Forty eight swines were submitted to the following treatments: T1 (Treatment 1) - diets with 39 ppm of tylosin phosphate; T2 (Treatment 2) - diets with 1.9 x 107 UFC/100g of ration; T3 (Treatment 3) - diets with 3.8 x 107 UFC/100g of ration and T4 (Treatment 4) - diets with 13.6 ppm of doxicycline chloridrate + 8.8 ppm of gentamicin sulfate. Were evaluated the daily weight gain, the daily feed intake, the feed conversion and the diarrhea occurrence. The experimental design was done in randomized blocks, with 4 treatments and 6 replications (each replication was represented by a pen with two swines). The performance data were submitted to a variance analysis (ANOVA) and the results were compared by the Tukey-Kramer post-hoc test. To compare the occurrence of diarrhea (among 2 treatments) was used the qui square test. There were no differences between treatments for performance parameters. The T1 presented the highest occurrence of diarrhea compared to the other treatments. The best economic efficiency results were observed to T4, T3, T1 and T2, respectively. The use of probiotics or antibiotics principles, on the applied doses, determined positive results in the performance of swines during nursery phase.