id	keyword
american_scientific_journal-3953	mastitis
american_scientific_journal-3953	prevalence
american_scientific_journal-3953	milk
american_scientific_journal-3953	study
american_scientific_journal-3953	cows
american_scientific_journal-3953	subclinical
american_scientific_journal-3953	composition
american_scientific_journal-3953	dairy
american_scientific_journal-3953	breed
american_scientific_journal-3953	factors
american_scientific_journal-3953	ethiopia