At cow level, the frequency of mastitis in the present study was 12.9%. Milk samples were examined for subclinical mastitis using the California Mastitis Test (CMT: Teepol® vial, opaque blister packs), and binary logistic regression was performed to test the influence of several risk factors (management type, herd size, breed, age of animal, and stage of lactation) on cow mastitis status (0 = negative and 1 = positive). Our examination revealed that 90.91% (almost all) of the herds observed had at least one cow suffering from subclinical mastitis. Between November 2019 and September 2020, a total of 154 lactating cows were sampled from 11 randomly chosen dairy farms.
In order to complete the national picture of livestock disease caused by bovine mastitis, a cross-sectional study design was conducted in a large dairy farm in the northeastern region of Algeria.
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