2002年春季在内蒙古科左后旗的天然草场上，采用跟群放牧全日观察法，定量研究了自然放牧状态下成年科尔沁牛牧食行为。
The grazing behavior of Kerqin cattle was studied with the whole day long eye observation method in the spring of 2002 at a natural pasture.
在农业星球，牧纳福牛是很常见的职业。那里的人民饲养纳福牛以获得它们的奶、肉和皮。
Nerfherding is a common profession on agrarian worlds, where nerfs are raised for their milk, meat and hides.
一名阿富汗女子奶过程中牧类牛，2011年9月8日，在喀布尔。
An Afghan woman milks a cow during an animal husbandry class, September 8, 2011 in Kabul.
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