Antibiotic use in commercial broiler chicken farming and its consequential resistance development in root colonizing bacteria of carrot grown in manure applied soils in a middle-income country
2021
Dandeniya, Warshi Shamila | Herath, Erandi M | Lowe, Ayesh M | Kasinthar, Mathaniga | Jinadasa, Rasika N | Vidanarachchi, Janak K | Samarakone, Thusith S
Broiler chicken litter (BCL) is a cheap manure for vegetable crops in developing countries. Extensive antibiotic use in poultry production could increase antibiotic resistant bacteria (ARB) in manure and eventually in crop root-microbiome. We investigated the prevalence of ARB in BCL from medium- and large-scale farms (n=33) and in carrot (Dacus carotova) grown in BCL applied soils in Sri Lanka. All the BCL samples contained aerobic bacteria resistant to 10 g/mL of oxytetracycline or enrofloxacin. The abundance of ARB determined by viable plate-count method ranged from 0.05% to 30.10% of aerobic bacterial population. Soil from two fields applied with BLC for three years (short history, SH) and ten years (long history, LH) were treated with BCL (10%, w/w) and oxytetracycline (10 and 100 mg/kg) in a pot experiment alongside an un-amended control. Adding BCL and oxytetracycline had a significant (P
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