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植建省福州市某种牛场,面积50亩,地势背山面平地,除牛舍等建筑外多为平地,地里有一些小水沟,外周有围墙。牲畜饮用并水,青饲料由该场两块橡草田(21亩)供给。饲养有不同品种引进牛42头,其中奶牛35头,肉牛7头。1983年起陆续发现有肝片吸虫病引起死亡,遂使用沼气池发酵牛粪和水田改旱地等多项措施杀虫。该场与外界有明确界线,有独立小生境的特点,成为研究肝片吸虫病的“天然实验场所”。
The construction of a province of Fuzhou City, a cow farm, an area of 50 acres, topography of the mountain back to flat, in addition to cows and other buildings mostly flat, there are some small ditches, the outer wall. Livestock is fed with water and green fodder is supplied from two fields (21 acres) of paddy field. There are 42 different breeds of cattle raised, of which 35 are dairy cows and 7 are beef cattle. In 1983, it was discovered that hepatic diseases such as trematodes caused deaths, then the use of biogas digesters to ferment cow dung and paddy fields to dry land and other measures to kill insects. The field has a clear boundary with the outside world, the characteristics of an independent niche, a study of hepatic diseases cheetah “natural experimental place.”