Oregano Essential Oil as Antimicrobial Agent in Broilers Diet

Abstract

O presente estudo objetivou avaliar a adição de óleo essencial de orégano como agente antimicrobiano e no desempenho de frangos de corte. Utilizou-se 250 pintos de corte, machos, da linhagem Cobb, que foram distribuídos em um delineamento inteiramente casualizado em grupos de cinco tratamentos e cinco repetições, com 10 aves cada: dieta com antibiótico e anticoccidiano (controle positivo); dieta sem antibiótico e anticoccidiano (controle negativo); dieta contendo apenas antibiótico; dieta com 0,5g de óleo de orégano; dieta com 1,0% de óleo de orégano. Foi observada uma menor freqüência de bactérias gram-positivas no íleo de frangos de corte tratados sem promotor de crescimento comparado com os grupos controle positivo ou com óleo de orégano (p < 0,01). Dentre as bactérias gram-positivas, os Lactobacillus apresentaram uma maior taxa de crescimento no íleo de frangos tratados com promotor de crescimento ou com 1g de óleo de orégano/kg de dieta. Porém, nos animais tratados com 0.5g de óleo de orégano foi verificada uma menor taxa de crescimento de Lactobacillus comparado com os tratados com 1g de óleo de orégano (p < 0,05), não diferindo do grupo controle negativo (p > 0,05). A adição de 1g de óleo de orégano/kg de dieta resultou em um menor peso relativo dos intestinos (p < 0.05), que não diferiu do grupo controle positivo (p > 0.05). Os resultados mostraram que a adição de 1g de óleo de orégano/kg de dieta exerceu um efeito antimicrobiano verificado por meio da redução do peso relativo dos intestinos e pelo aumento na frequência de Lactobacillus.

Oregano essential oil in the diet of broilers: performance, carcass characteristics, and blood parameters

“…The performance results in the initial phase are in agreement with those obtained by Kirkpinar et al (2011) and Alp et al (2012), who found no difference for feed intake, weight gain and feed conversion at day 21 in broilers administered 300 mg OEO/kg diet. Zanini et al (2013) also observed no significant difference in weight gain, either in the initial phase or in the entire experimentation phase, when broiler feed was supplemented with OEO at 0.5 g/kg and 1 g/kg. Franciosini et al (2016) reported that when feed was supplemented with a mixture of aqueous extracts of oregano and rosemary (2 g/kg), broilers presented a significant improvement in weight gain compared with the control treatment without the extracts.…”

“…The main components of oregano essential oil (OEO) (Origanum vulgare L.) are carvacrol and thymol, which together represent up to 85% of its composition (Burt, 2004). Oregano essential oil has been associated with antifungal (Bedoya-Serna et al, 2018), antibacterial, and antioxidant activity in vitro (Gandra et al, 2013) and in vivo (Zanini et al, 2013;Ri et al, 2017), stimulation of enzyme secretion (He et al, 2017), and modulation of microbial colonization of the gastrointestinal tract and intestinal morphology (Dias et al, 2015;He et al, 2017). However, reports of its effects on the performance and carcass characteristics of broilers have been inconsistent, with positive effects on these characteristics (Mathlouthi et al, 2012;Peng et al, 2016) as opposed to no effects (Alp et al, 2012;Koyama et al, 2014) being detected.…”

The Biological Activity of Monarda didyma L. Essential Oil and Its Effect as a Diet Supplement in Mice and Broiler Chicken

“…Furthermore, a cell-based assay with an IC 50 of 4.6 µg•mL −1 highlighted the EO antioxidant activity (Table 3). The antibacterial and antioxidant activities of other members of the Lamiaceae family have been observed, principally for T. vulgaris and Origanum vulgare [32][33][34][35][36]; however, the biological activities of M. didyma are less well known. Fraternale et al [22] used a DPPH and lipid peroxidation test to demonstrate the elevated antioxidant activity of M. didyma EO.…”

Essential oil of Rosmarinus officinalis induces in vitro anthelmintic and anticoccidial effects against Haemonchus contortus and Eimeria spp. in small ruminants

“…The studies by Saini et al (2003a) argue that oregano essential oil reduces the principle of coccidiosis in broilers even if coccidiosis is expressed. This volatile oil can decrease the necrotic enteritis Veterinarni Medicina, 66, 2021 (04): 146-155 https://doi.org/10.17221/139/2020-VETMED (Saini et al 2003b). The process of action of these beneficial results remains unexplained.…”