Eucalyptus oil to mitigate heat stress in broilers

Abstract

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.

Effect of the addition of essential fatty acid mixture to the drinking water of the heat stress broilers on adipokine (Apelin, BDNF) response, histopathologic findings in liver and intestines, and some blood parameters

“…In the studies made on the effects of EOM (Eucalyptus globulus Labill, Thymus vulgaris, Cymbopogon nardus ve Syzgium aromaticum) mixture on the plants, they were reported to have antioxidant (Vollmayr et al 2001), anti-microbial (Karpouhtsis et al 1998;Dorman and Deans 2000;Ultee et al 2002), antiinflammatory (Bishop 1995;Guimarães et al 2013), anti-viral (Al-Ja'fari et al, 2011Silva et al 2011), antitumoral (Al-Ja'fari et al, 2011, anti-fungal (Fu et al 2007;Monzote et al 2007), antiparasitic (Chowdhury et al 2018) and positive effects on growth performance by having effects on intestinal villuses via digestional enzymes (Jang et al 2007). In addition, positive effects of Essantial oil supplementation in broiler chickens exposed to heat stress has been confirmed by other authors (Parvar et al, 2013;Gopi et al, 2014;Akbarian et al 2015;Petrolli et al, 2019).…”

Avaliação da utilização de óleos essenciais de canela, orégano e eucalipto via água de bebida para frangos de corte

“…Na Tabela 3 estão apresentados os dados de desempenho, as aves suplementadas com óleo de eucalipto via água de bebida desenvolvem maior ganho de peso, quando comparado com o tratamento que continha o promotor de crescimento flavomicina e demais aditivos. Petrolli et al (2019) observou peso corporal significativo aos 35 dias de idade no tratamento via água de bebida contendo óleo de eucalipto, portanto, concluiu-se que pode ser usado para frangos de carne estressados pelo calor sem prejudicar seu desenvolvimento. Ainda Flees et al (2020), observou eficiência produtiva através da modulação de um anuropeptídio hipotalâmico e orexigênico, em aves suplementadas dieteticamente e via água de bebida, que apresentou melhora significativa sob a eficiência alimentar, que foi alcançada através da redução da temperatura corporal central, sem interferir no consumo e consequentemente obtendo ganho de peso de mercado.…”