牲畜的生長或其產(chǎn)品的生產(chǎn)量是農(nóng)學(xué)家最關(guān)心的問題.Animal growth or product yield is the ultimate concern of the agriculturalist.牲畜的分布,可采用牛 、 羊 、 山羊 、 家禽等圖形表示.Distribution of livestock can be shown better by symbols representing cattle, sheep, goa...