Óleo essencial de Lippia gracilis shauer (alecrim da chapada) em dietas de codornas japonesas em crescimento

• Ano de defesa: 2017
• Autor(a) principal: Cardoso Júnior, Gilmar Silva
• Orientador(a): Oliveira Júnior, Gregório Murilo de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Zootecnia
• Palavras-chave em Português: Zootecnia; Essências e óleos essenciais; Alecrim; Alimentos; Aditivos; Aves; Codorna; Antibiograma; Coturnicultura; Promotores de crescimento
• Palavras-chave em Inglês: Additive; Antibiogram; Coturniculture; Growth promoters; Poultry
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::ZOOTECNIA
• Link de acesso: https://ri.ufs.br/handle/riufs/7040

The ban on the use of industrial antibiotics as performance-enhancing additives by the European Union has stimulated the studies to replace these additives in animal production with other alternatives additives. Among these studies, are the studies that evaluate the essential oils of aromatic plants that can present similar effects to the conventional additives. The objective of this trial was to evaluate the essential oil of Lippia gracilis as an antimicrobial agent against the bacteria Salmonella sp and Escherichia coli, and as a possible performance enhancer in growing Japanese quail diets. The experiment was conducted in a completely randomized design and the birds distributed within six treatments, seven replicates and twelve birds per plot. The treatments were: increasing levels of essential oil (0.0, 100, 200, 300 and 400mg/kg of feed) and a treatment with bacitracin (BMD). An antibiogram test, performance evaluation and quantitative microbiology of the intestinal contents of the birds were evaluated. The antibiogram and the microbiology were analyzed descriptively. For performance, linear and quadratic regressions were used. In addition, the Dunnett Test was used to evaluate with BMD treatment against the others. It was observed that in the in vitro test (antibiogram), the essential oil was effective in inhibiting the growth of Escherichia coli and Salmonella sp. In initial phase, there was reduction in feed intake and an improvement in feed conversion with an increase in the inclusion of Lippia gracilis essential oil in diets. The treatment containing BMD presented higher feed intake from to 200mg/kg of essential oil and greater weight gain from to 100mg/kg of essential oil. In the period from 2 to 35 days, the relative weight of the proventriculus, gizzard and intestine were increased with the inclusion of the essential oil in the diet compared to the BMD treatment. On the other hand, treatment content BMD presented higher feed intake and worse feed conversion compared to other treatments. Concluded that the increase in the levels of Lippia gracilis essential oil from the plateau up to 200 mg/kg reduced feed intake and weight gain from 2 to 21 days of age. In the period from 2 to 35 days of age, the treatment containing BMD provided an increase in feed intake and an improvement in feed conversion compared to the other treatments.