Abstract
Washed bovine erythrocytes labeled in vitro with radioactive chromium were resuspended in physiological saline and injected into an 11-month-old Hereford heifer that was heavily infested with the common scabies (sheep scab) mite of cattle and sheep, Psoroptes ovis . After 24 h the mites were harvested and the radioactivity measured. The mites contained an average of 1 μl of blood per 100 mg of mites and had digested ca. 37% of the hemoglobin. The data show that P. ovis mites ingest erythrocytes during feeding on cattle but not to the extent that they do while feeding on rabbits as determined in an earlier study.
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