breed line vs line of descent

breed line and line of descent both are nouns.

Word	Noun	Adjective	Verb	Adverb
breed line	Yes	No	No	No
line of descent	Yes	No	No	No

As nouns, line of descent is a hypernym of breed line; that is, line of descent is a word with a broader meaning than breed line:

breed line: Breed line is offspring from the mating or breeding of individuals or organisms that are closely related genetically.
line of descent: the hereditary derivation of an individual

Other hypernyms of breed line include ancestry, blood, blood line, bloodline, descent, line, lineage, origin, parentage, pedigree, stemma, stock.

breed line (noun)	line of descent (noun)
Breed line is offspring from the mating or breeding of individuals or organisms that are closely related genetically.	the hereditary derivation of an individual
	the kinship relation between an individual and the individual's progenitors