id	keyword
afs-71921	nitrogen
afs-71921	cows
afs-71921	urea
afs-71921	ulp
afs-71921	total
afs-71921	urine
afs-71921	creatinine
afs-71921	feed
afs-71921	excretion
afs-71921	contents
afs-71921	urea nitrogen