Rodents are intelligent and social animals. It is quite easy for an infestation to build up without you ever seeing them since their nocturnal habits tend to keep rodents away from human eyes. If you do see rodents during the day, there is most likely a sizable infestation. 

The best protection for your farm against rodents is the Bug Blaster Rodent Protection service.  This monthly maintenance program will give your farm the best protection, providing a rodent management program that focus on using a systematic approach to minimize rodents.