noun
coat (of hair or fur); lie of hair
Refers to the quality, texture, or direction of an animal's fur or hair. Often used when describing a dog's or cat's coat.
この犬は毛並みがとてもきれいだ。
This dog has a very beautiful coat.
猫の毛並みをブラシで整える。
I groom the cat's coat with a brush.
noun
Figurative extension from animal coat to a person's background, quality, or pedigree. Sense 3 is colloquial and often implies good breeding or high class.
彼は毛並みのいい家柄の出身だ。
He comes from a family of good lineage.
あの会社の社員はみんな毛並みが違う
The employees at that company are all of a different sort.
血統 is a more formal term for bloodline or pedigree, often used in animal breeding or genealogy, while 毛並み is a colloquial metaphor for lineage or quality.
品種 refers to a breed or variety, especially in biology or agriculture, whereas 毛並み focuses on the coat quality or, figuratively, the perceived class of a person.
Compound of 毛 (ke, 'hair') and 並み (nami, 'line, row, average'). The literal meaning is the lie or arrangement of hair, which extended metaphorically to a person's background or quality.