故事发生于伊朗一个贫瘠的小山村，全村仅有一头奶牛。这头罕有的奶牛得到了无比的重视，尤其是奶牛的主人，更是视其为生命。可一件不幸的事情破坏了村子的平静。有一次奶牛主人外出，嘱咐村民替他好好看管奶牛，然而，尽管村民小心翼翼，奶牛居然莫名其妙地死去了。这引了轩然大波，村民们不知该如何面对奶牛主人，他们商量对策之后，决定在奶牛主人回来时，告之奶牛跑了。可奶牛主人无论如何接受不了奶牛丢失的理由，他疑惑、焦虑直至精神失常，并做出种种怪异的行为，比如幻想自己就是那条奶牛、做出奶牛吃草、撞墙等等举动，让村民们无可奈何。最终忍无可忍的村民决定把发疯的奶牛主人送走，在人们捆绑他的时候，奶牛主人拼命挣扎逃跑，最后掉入水沟死去。
在一个小村庄，人们的生活都依赖于一头奶牛。它是由主人哈桑和村民一起抚育的。当哈桑离开村庄时牛却神秘死去，当地人非常惊愕，大家决定跟哈桑说他的牛跑掉了。哈桑悲痛难当，渐渐开始相信自己就是那头牛。（movie mytime)
Dariush Mehrju'i (Persian: ?????? ??????? , born on 8 December 1939 in Tehran, also spelled as Mehrjui, Mehrjoui, and Mehrjuyi) is an Iranian director, screenwriter, producer, film editor and a member of the Iranian Academy of the Arts.[3]
Mehrjui was a founding member of the Iranian New Wave movement of the early 1970s. His second film, Gaav, is considered to be the first film of this movement, which also included Masoud Kimiai and Nasser Taqvai. Most of his films are inspired by literature and adapted from Iranian and foreign novels and plays.