在计划经济时代 ,城市居民就享受着送奶工每天及时准确的送到家门的可口鲜奶。一杯牛奶、几片面包 ,既省时省力、解饥解渴 ,又满足了人体所需要的营养成份。特别是在当今改革开放的快节奏生活时代 ,牛奶就更是中国大众的首选食品之一。可对于生活在农村（农场）的广大居民、养 In the era of planned economy, urban residents enjoy the delicious fresh milk delivered to the house by the milkman every day in a timely and accurate manner. A cup of milk, a few slices of bread, both time-saving effort, relieve hunger thirst, but also to meet the human body needs nutrients. Especially in the fast-paced life of today’s reform and opening up, milk is even more the food of choice for the Chinese people. For the majority of residents living in rural areas (farms), raising