Occurrence: Worldwide. Species affected: All. Age affected: All.

Causes: Norwegian rat (Rattus norvegicus) is the most common rat around poultry houses.

Effects: Rat harbourage around poultry houses is seen in the form of burrows in the ground and under the foundation, litter under the slats, old nests and debris around the house. Most rat activity occurs at night, and rats seen during the day indicate a large population. Rats eat almost anything...