Survival of faecal indicator bacteria in treated pig manure stored in clay-covered heaps in Vietnam

TY - JOUR

T1 - Survival of faecal indicator bacteria in treated pig manure stored in clay-covered heaps in Vietnam

AU - Dang, Son Thi Thang

AU - Truong, Dung Van

AU - Madsen, Henry

AU - Dalsgaard, Anders

PY - 2011/9/28

Y1 - 2011/9/28

N2 - Small-scale pig farmers in Vietnam typically store manure in heaps covered by a layer of clay. However, the hygienic quality of manure applied to agricultural soil is uncertain as storage time is determined by the need for soil fertilizer. This study aimed to assess how the storage of pig manure added straw, lime stone or urea in heaps covered by clay affected the survival of faecal bacteria. E. coli was reduced from 4log 10CFU/g to below the detection limit within 2 weeks with 2% (w/w) urea (CO(NH 2) 2) whereas other amendments were associated with limited E. coli reductions. Enterococcus spp. were not reduced in any heaps indicating possible re-growth and that enterococci should be used as hygiene indicators with caution. Follow-up research should document the practical conditions under which the farmer practice of storing manure with a clay cover can be utilized to obtain a bactericidal effect of ammonia and a safe product with high fertilizer value.

AB - Small-scale pig farmers in Vietnam typically store manure in heaps covered by a layer of clay. However, the hygienic quality of manure applied to agricultural soil is uncertain as storage time is determined by the need for soil fertilizer. This study aimed to assess how the storage of pig manure added straw, lime stone or urea in heaps covered by clay affected the survival of faecal bacteria. E. coli was reduced from 4log 10CFU/g to below the detection limit within 2 weeks with 2% (w/w) urea (CO(NH 2) 2) whereas other amendments were associated with limited E. coli reductions. Enterococcus spp. were not reduced in any heaps indicating possible re-growth and that enterococci should be used as hygiene indicators with caution. Follow-up research should document the practical conditions under which the farmer practice of storing manure with a clay cover can be utilized to obtain a bactericidal effect of ammonia and a safe product with high fertilizer value.

KW - Former LIFE faculty

KW - Pig manure

KW - Urea

KW - Ammonia

KW - E. coli

KW - Survival

KW - Vietnam

U2 - 10.1016/j.vetmic.2011.05.004

DO - 10.1016/j.vetmic.2011.05.004

M3 - Journal article

SN - 0378-1135

VL - 152

SP - 374

EP - 378

JO - Veterinary Microbiology

JF - Veterinary Microbiology

IS - 3-4

ER -