Abstract
Abstract Seventy-two 61-wk-old hens which had been infested with northern fowl mites for 17 wk were divided into 3 groups of 24 hens. Each group was then placed into individual cages and fed standard diets calculated to contain either 0 (control), 5 or 7 ppm of Cygro (American Cyanamid’s CL-259,971) for 21 consecutive days. Individual hen body weight and mite ratings were obtained prior to starting the test and at weekly intervals thereafter. Feed consumption and % hen day egg production were obtained at 7, 14, and 21 days posttreatment. Mite ratings were visually observed and recorded using the following rating: 0—no mites; 1—very light (1-10 mites/hen); 2—light (11-100 mites/hen); 3—moderate (101-1000) mites/hen); 4—heavy (1001-10000 mites/hen); and 5—extra heavy (>10000 mites/hen).
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