5 June 2019
Integrating Farming and Forestry

Farm Woodland Forum annual meeting

2 July 2019
Trees and Livestock - Buckinghamshire

Agroforestry Innovation Network Meeting



16 May 2019
Organic farming statistics 2018

Defra releases estimates of the land area farmed organically, crop areas, livestock numbers and numbers of organic producers and processors in the UK

10 May 2019
Agroecological transitions

Five case studies of farmers' experiences published



21 March 2019
In adversity, what are farmers doing to be more resilient?

Opportunities, barriers and constraints in organic techniques helping to improve the sustainability of conventional farming

Lower Prevalence of Antibiotic Resistance

Category: News
2 October 2011

A study published this month in Environmental Health Perspectives has found lower antibiotic resistance on newly organic farms compared to conventional farms in the US.

In conventional poultry production, antimicrobials are used for therapeutic, prophylactic and non-therapeutic purposes. Researchers have shown that this can select for antibiotic-resistant commensal and pathogenic bacteria on poultry farms and poultry-derived products. The following study investigated on-farm changes in resistance as conventional poultry farms converted to organic practices and ceased using antibiotics.

Litter, feed and water samples were tested from 10 conventional and 10 newly converted organic farms. The percentages of resistant E. faecalis and resistant E. faecium were significantly lower (p<0.05) among isolates from newly organic versus conventional houses for two (erythromycin and tylosin) and five (ciprofloxacin, gentamicin, nitrofurantoin, penicillin and tetracycline) antimicrobials respectively.

Forty-two percent of E. faecalis isolates from conventional poultry houses were multi-drug resistant (MDR) (to°›3 antimicrobial classes) compared to 10% of isolates from newly organic houses (p=0.02), and 84% of E. faecium isolates from conventional houses were MDR compared to 17% of isolates from newly organic poultry houses (p<0.001).

The authors concluded that the transition to organic practices is associated with a lower prevalence of antibiotic resistant and multi-drug resistant Enterococcus.

Sapkota AR, Hulet RM, Zhang G, McDermott P, Kinney E, Schwab K, et al. 2011. Lower Prevalence of Antibiotic-resistant Enterococci On U.S. Conventional Poultry Farms That Transitioned to Organic Practices. Environ Health Perspect :-. doi:10.1289/ehp.1003350

Keywords: poultry antibiotics resistance antimicrobials bacteria conversion

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