城市下水污泥养殖的蚯蚓对产蛋鸡的影响

近年来在我国兴起的蚯蚓养殖热中,有相当一部分是用城市下水污泥、垃圾和各类工厂排放的污水沉降底泥等废物做饵料进行养殖的,用城市下水污泥养殖蚯蚓不仅能使污泥得到一定程度的净化、而且还可得到大量蚯蚓,这种蚯蚓如能加以有效的利用将会给污泥的资源化提供一个新途径。

Effects of Earthworms Cultivated in Munieipal Sewage Sludge on Feeding Laying Hens

The earthworms cultivated in municipal sewage sludge was treated with boiling water and then added to the diets of laying white Leghorn hens at rates of 10% (fresh weight), The diets containing earthworms were fed to hens for 60 days. Feed intake, egg production, egg weight and the rate of egg lay were determined daily throughout the experiment. Relative liver weight was measured and tissues were collected for chemical analyses and pathological examination at the end of experiment. The results showed that the consumption of feed increa-led significantly (P<0.05) during the experifeht, egg production reduced significantly (P<0.05) after 30 days and hen livers were injured. Health and performance were affected adversely. However, the elemental concentrations of six metals (Cd, Pb, Hg, Ni, Cu and Zn) in eggs and breast muscle did not increase significantly.