id	keyword
ct-9271	testicular
ct-9271	degeneration
ct-9271	sperm
ct-9271	bulls
ct-9271	testes
ct-9271	cells
ct-9271	doi
ct-9271	quality
ct-9271	cases
ct-9271	semen
ct-9271	production
ct-9271	theriogenology
ct-9271	cause
ct-9271	spermatogenesis
ct-9271	testosterone