id	keyword
grj-291	egg
grj-291	chicken
grj-291	breeds
grj-291	production
grj-291	egg production
grj-291	bulgarian
grj-291	rpch
grj-291	lukanov
grj-291	feed
grj-291	group
grj-291	weight
grj-291	poultry
grj-291	average
grj-291	period
grj-291	chicken breeds