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| | Training Manual Integrated Fish Farming in China |
 | | Ducks should be on the market as soon as they reach the marketable size or they will lose their feathers, resulting in decrease of food efficiency, body weight and commodity value. |
 | | Ducks swim loosely in the wet run to search for food, their excreta drop evenly into the wet run and the effects of fertilization of duck droppings expand to the whole pond through winds and waves. |
 | | Apart from providing 1,000,000 kg of duck manure and large amount of leftover to fish ponds, it harvested 212,695.9 kg of duck eggs, 6059 kg of duck meat, thus providing the market with 24315 kg of available animal protein which is equivalent to 215560 kg of Grass carp protein. |
| www.fao.org /docrep/field/003/AC233E/AC233E08.htm (7859 words) |
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