Evaluación del suministro de agua residual tratada por separación, sedimentación, filtración en la salud de cerdos destetados

The purpose of this study was quantifying enterobacteria and identifying Salmonella spp in wastewater treated by separation/ sedimentation/filtration, and evaluating its effect on nursery pigs. In Stage 1, a total of 40 samples were collected (i.e.: 2 weekly samples at each of four points [sedimentation pit and three filters] for 5 wk). In Stage 2, 24 pigs were assigned to three treatment groups (T1= filtered/chlorinated water, T2=filtered water, T3=potable water). The following variables were studied: daily feed intake, total feed intake, daily water intake, total water intake, feed conversion rate, body temperature, body weight gain, and clinical conditions. In Stage 1 no differences (P>0.05) were found in enterobacteria among water treatment stages, but S. enterica was isolated from 15 % of the samples. During Stage 2, daily feed intake differences (P<0.05) were found from day 4 to day 9 in T2 as compared to T1 and T3. Total feed intake was higher (P<0.05) in T1. Body temperature was higher (P<0.05) in T2 on d 3 and 4. Clinical condition differences (P<0.05) were found among treatments on d 4, 5, 8 and 11. S. enterica was re-isolated from the iliocecal valve and the liver of two T1 pigs, and from the iliocecal valve of one T2 pig. This treatment type does not warrant the use of this water as drinking water. Therefore it should be used for other purposes.