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E t b 7 hbks(RmmdjirpubWon Deam&r 4, 1997) summnry The counts of different groups of organisms (mesophilic total aerobic and anaerobic bacteria, cntuobactcriaccac. faecal coliform bacteria and f a d streptococci type D), as well as the presence or absence of Psenhmoonrrr spp. and SkhoncUO spp., were recorded in both unfiltered and filtered pig slurry samples at 1,8 and 29 days of storage, before and after applying N-duopropenidc (a new disinfectant with a quaternary ammonium structure) at 1.2 x 1,5 and 2 x 5% concentrations of the commercial product (equivalent to 0.11, 2 x 0.11, 0.55 and 2 x 0.55%. respectivcly. of active ingndicnt) for 1 h, or 0.5% commcrical formaldehyde for 6 days. Before disinfection, anaerobic and aerobic organisms resulted in the lugfiest counts (between 6 and 7 log unidml), followed by enterobactekccac, faecal coliforms and streptococci (4-5 log unidml). The unfiltered slurry showed higher bacterial counts than the filtered slurry. The variation in counts was Similv for all the groups studied, with the highest count on day 1 of storage with a continuous decrease over the 3 days studied. N-duopropenide efficacy depended on the dose used. but a 2 x 5% concentration resulted in total inactivation (1W/o reduction) of d the bacteria studied, except for the total aerobic and anaerobic organisms present in unfiltered slurry. Formaldehyde efficacy was much lower. In respect of P s d m o w spp., more isolates were obtained after using Nduopropenide at lower concentrations (1 and 2 x 1%) than before treatment, thus suggesting its suitability for selective isolation of this genus. Finally, no SkhonecUa spp. strains were isolated in any of the cases considered in this study. U. S. ~r a e a m n c e~c n r n~o d c~p m m n e