The objective of this study was to evaluate performance, hematological parameters, leukocyte counts, and respiratory microbiota of broilers under heat stress receiving eucalyptus oil supplementation. Cobb broilers (n = 1200) were randomly distributed on the first day of life in a factorial arrangement with additional treatment (2 × 2 + 1) with two periods of oil administration via drinking water (daily, from 18 to 35 days of life) and two periods of oil administration via spray (daily, from 18 to 35 days of age) plus a control treatment, consisting of twelve replications, with 20 animals each. The birds were kept in a controlled environment with constant temperature at 32 °C to induce heat stress by infrared heaters. Eucalyptus oil was supplied by drinking water (1 L of oil to 4000 L of water) or by spray applications with a pump (1 L of oil to 200 L of water). Bird weight was recorded at 42 days of age, along with remaining feed, to determine weight gain, feed intake, and feed conversion. In addition, one blood sample from each bird repetition was collected for hematological and leucocytic evaluation. To assess respiratory microbiota, a tracheal flushing was performed for bacteria counts. There was no difference in performance, hematological parameters, and leukocyte counts, except hematocrit, which was lower in birds that received eucalyptus oil after 18 days of age. No significant differences were observed in the respiratory microbiota comparing oil-treated and -untreated groups. Although it was not possible to verify statistical difference, the birds that received eucalyptus oil via spray plus spray from 18 days old showed lower bacterial counts and absence of isolation of Gram negatives, while the control group was the one with the highest number of Gram negatives. Therefore, eucalyptus oil can be used for heat-stressed broilers without impairing their development.
Palavras chave adicionaisÁcidos orgânicos. Antibióticos Leitões. Polifenóis. Promotor de crescimento.resUMo Objetivou-se avaliar o efeito da adição de um complexo contendo extratos herbais de Acacia minearnsii e Castanea sativa, associados a um blend de ácidos orgânicos contendo os ácidos butírico, cítrico, fumárico e ascórbico em substituição a antibióticos em dietas de leitões na fase de 7 a 10kg de peso corporal. O experimento foi executado nas instalações de uma granja comercial, situada no município de Xanxerê, Santa Catarina, Brasil. Foram utilizados 400 animais, na faixa de 7 a 10kg de peso, distribuídos em delineamento inteiramente ao acaso em quatro tratamentos com quatro repetições cada, compostas por 25 animais cada. Os tratamentos experimentais foram: T1: Controle Positivo (Colistina + Florfenicol) (1000ppm); T2: Complexo herbal + Butirato (300ppm); T3: Complexo herbal + Butirato (600ppm); T4: Complexo herbal + Butirato (1200ppm). Foram avaliados parâmetros sanguíneos (hemograma, leucograma, contagem plaquetária, glicemia e colesterolemia), parâmetros de desempenho (ganho de peso, consumo de ração e conversão alimentar) e ocorrência de diarreias. Os dados experimentais foram submetidos à análise de variância, e na presença de diferença significativa, as médias foram submetidas ao teste SNK a 5% de significância. Não foram constatadas alterações significativas sobre os parâmetros hematológicos ou leucocitários dos suínos avaliados. Não houve alteração na contagem plaquetária, nos níveis de glicose e de colesterol sanguíneos .O desempenho e a ocorrência de diarreias não foram afetadas pelos níveis do blend de extratos herbais e ácidos orgânicos em substituição aos antibióticos. Conclui-se que estes compostos podem ser utilizados como promotor de crescimento em substituição aos antibióticos, sem causar comprometimento nos parâmetros sanguíneos e no desempenho de leitões na fase pós-desmama.inforMation Cronología del artículo. Recibido/Use of herbal extracts and sodium butyrate in swine in the 7 to 10 kg stage sUMMarY The objective was to evaluate the effect of the addition of a complex containing herbal extracts of Acacia minearnsii and Castanea sativa, associated with a blend of organic acids containing butyric, citric, fumaric and ascorbic acids in diets of piglets in the stage of 7 to 10 kg of body weight. The experiment was carried out on the premises of a commercial farm located in the municipality of Xanxerê / SC. A total of 400 animals, 7 to 10 kg in weight, were distributed in a completely randomized design in four treatments with four replicates each, composed of 25 animals each. The experimental treatments were: T1: Positive Control (Colistin + Florfenicol) (1000ppm); T2: Herbal complex + butyrate (300 ppm); T3: Herbal complex + butyrate (600 ppm); T4: Herbal complex + Butyrate (1200ppm). Blood parameters (blood count, leukogram, platelet count, blood glucose and cholesterolemia), performance parameters (weight gain, feed intake and feed conversion) and diarrhea were evaluated. The experimental...
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