The term casings refer to the intestinal tract of the animal or gut set. For pigs it consist of the stomach, large and small intestines, middle cap, bladder and bung, for cattle the casings consist of the stomach,, bladder, small intestine, large intestine, bung. Certain parts of the cassings can be processed into a number of value added products, such as sausage skins, surgical sutures and strings for musical instruments and tennis rackets. Processing of casings involve desliming to remove the inner lining "mucosa" and washing. If casings are not processed into value added products, they are generally sent for rendering with or without prior washing.
Buoyancy The density of fresh water is considerably less than that of the sea and such floatation is a greater problem for fresh water plankton. There is occasional flooding which submerges the plants. The water lilies, water lettuce, water hyacinth are able to stay afloat because of the air spaces in the lower part of the leaves as well as in the skins and roots.
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