Farmers in traditional society didn't regularly keep a whole lot of information on domestic animals, not to mention their genes, blood types and so forth. The distinguishing characteristics of native breeds can only be roughly sketched out from descriptions and "person-to-animal" verifications by old-timers.
農村社會，對畜禽沒有建立太多資料，更不用說是遺傳基因、生理血型檢定；土種的模樣也只能從老一輩農民的形容中，勾勒外形、特徵，或待各地農會四處蒐集來時，請老農夫們親去「相相看」。