Abstract
ABSTRACT This study aimed to evaluate the hematological profile, hepatic function, and histopathology of mixed-sex broilers fed rations supplemented with microencapsulated essential oils from Cymbopogon flexuosus (lemon grass) and Lippia rotundifolia (cha-de-pedestre). One hundred and fifty Cobb chicks were housed in cages from 1 to 42 days of age in a completely randomized design, with six replicates with five chickens in each of five treatments (150 total chicks): basal diet without antibiotic growth promoter (negative control), diet with enramicina and [...]
Highlights
Antibiotics in small dosages added to the avian diet as growth promoters result in better utilization of nutrients by the birds and higher growth rates and feed conversion efficiency
This study aimed to evaluate the hematological profile, hepatic function, and histopathology of mixed-sex broilers fed rations supplemented with microencapsulated essential oils from Cymbopogon flexuosus and Lippia rotundifolia
One hundred and fifty Cobb chicks were housed in cages from 1 to 42 days of age in a completely randomized design, with six replicates with five chickens in each of five treatments (150 total chicks): basal diet without antibiotic growth promoter, diet with enramicina and salinomycin, diet with lemon grass essential oil, diet with L. rotundifolia essential oil, and diet with a mixture of lemon grass and L. rotundifolia essential oils
Summary
Antibiotics in small dosages added to the avian diet as growth promoters result in better utilization of nutrients by the birds and higher growth rates and feed conversion efficiency. Antibiotics act on the intestinal health of chickens. This practice has contributed to the emergence of resistant strains of microorganisms (Attia et al, 2017a). Some countries have banned the use of antibiotics as additives in animal feed to minimize the transmission and spread of resistant bacteria through the food chain (Attia et al, 2018). The use of organic acids, enzymes, pre- and probiotics, and essential oils may result in higher performance and better intestinal health without the inconvenience of antibiotic resistance (Dhama et al, 2015; Zeng et al, 2015; Cho et al, 2014; Krishan and Narang, 2014). The possible toxic effects and/or changes in metabolism caused by essential oils still generate doubts regarding their safety
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