Effect of Trimming Feathers off Abdominal and Crural Tracts of the Hen on Parasitism of Mites.
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It is considered that trimming feathers off abdominal and crural tracts of a hen makes uncomfortable circumstances for parasitizing mites. Two experiments of trimming feather off pterylae of hens were conducted to study of parasitism of mites. Hens used in the two experiments were kept in individual cages in a laying house. The hens were surrounded with hens being not used in the experiments. As the surrounding hens were infested with mites, the hens used in the experiments had a chance to be infested with the mites from the surrounding hens.Laying hens (193 days old) were infested with mites heavily (1, 001-10, 000 mites/hen) were used in Expt. 1. The parasitism of the mites was observed neither until 6 weeks after trimming feathers off abdominal tract nor until 7 weeks after trimming feathers off abdominal and crural trccts. A number of mites parasitized hen two trimmed groups in Expt.1 were smaller than that of hen non-trimmed (control) group. The hens of the control group were parasitized heavily with mites as the same level at the start of the experiment.In Expt. 2, 119 days of age hens were used. They were no infestation with mites. After trimming of feathers on abdominal tract, they were kept in the laying house. Infestation with mites were observed at 5 weeks after housing in trimmed hen group while 4 weeks in control group. A number of the mites parasitized hens of trimmed group were less than 10 per hen and hens of control were over 1000 per hen. Parasitism was observed in 28.2% of hens of the trimmed and 100% of hen of control group, respectively.Hematocrit value of the hens of feather trimmed two groups was increased significantly in Expt. 1 and was not decreased in Expt. 2, comparing with the values at the begining of each experiment. Egg production of two trimmed groups also increased significantly comparing with production at the experiment started in Expt. 1. No increase of egg production was observed in control group. In Expt. 2, egg production of trimmed group was also higher than that of control group. Egg Production of the hens of trimmed groups was higher than that of control groups in Expts.1 and 2, respectively.Though trimming feathers off abdominal and/or crural tracts of the hen is not to eradicate and prevent parasitism of the mites completely, it is clarified to be useful in practice.
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