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Mus musculus (house mouse) is a serious rodent pest in poultry farms of Argentina. In these habitats, bromadiolone is the most frequently used anticoagulant. In spite of this control, more than 90% of the farms are infested with rodents. The frequent application of anticoagulants and the permanent presence of M. musculus suggest that there are resistant rodent populations. The goal of this study was to assess bromadiolone susceptibility through a blood clotting response (BCR) test in M. musculus populations inhabiting poultry farms of Exaltación de la Cruz, Buenos Aires, Argentina. Results showed that 56.6% of wild M. musculus were responders to the BCR test. We found non-responder individuals in all the poultry farms studied. Non-responder females had at least one non-responder offspring. Since the percentages of resistant animals per poultry farm were high and considering that bromadiolone is extensively used for rodent control in these habitats, there is a potential risk of an increase in the proportion of resistant individuals and a decrease in the effectiveness of bromadiolone through time in the study area. Besides, our results suggest that this resistance has a genetic basis because non-responder mothers had non-responder offspring. [ABSTRACT FROM AUTHOR]

Mus musculus, Rattus rattus and Rattus norvegicus are pests in poultry farms, causing economic losses and transmitting diseases. Control is commonly conducted through anticoagulant rodenticides, but this control is not effective through time. We aimed to assess the effect of rodent exclosure on long-term success of rodent control in poultry farms of the pampean region, Argentina, and to evaluate indirect estimators of rodent abundance. In both exclosure and non-exclosure sheds rodent abundance decreased significantly after eradication but mice populations showed a recovery, suggesting that the eradication was not complete. Rats did not recover, but the low abundance found at the beginning of the experiment does not allow an accurate conclusion. [ABSTRACT FROM AUTHOR]

The article presents a study which examines the susceptibility of bromadiolone in wild and laboratory Mus musculus L. or house mice in Buenos Aires, Argentina. It involves animals that were captured in poultry farms and a laboratory strain and were fed with bromadiolone. It concludes that there is a presence of anticoagulant resistant Mus musculus L. which may be influenced by the feeding behaviour of animals.