noun
improved variety; improved strain; improved breed
Refers to a plant variety, animal breed, or strain that has been selectively bred or genetically improved for desirable traits.
この改良種の米は病気に強い。
This improved rice variety is resistant to disease.
農家は収穫量を増やすために改良種を導入した。
Farmers introduced improved strains to increase yields.
Native or traditional variety, often contrasted with 改良種 which has been artificially improved.
Compound of 改良 (improvement) and 種 (seed, species, variety).