| Piglet electrical heating panels were especially designed for piglets to avoid frostbite and to increase the survival rates of piglets when they were born and suckled in cold climate. Today, piglet electrical heating panels have become one of the most popular partial heating apparatus in the world.With the using of piglet electrical heating panels, the mortality of piglets had dropped sharply. However, many old types of piglet electrical heating panels on which the electro-thermal wires were fixed, didn't work well if piglet electrical heating panels got ageing or could not come into contact with leads firmly, and producers had to throw away the whole panels, which made a large quantities of economic loss. In addition most of these old types of piglet electrical heating panels only had two alternatives of power in design, 240W and 120W, which not only affected the regulation and temperature stabilization of electrical heating panels that let piglets feel hot or coo! unexpectedly on their abdomen, disturbed its normal rest, but also led to a great deal of waste of power simultaneously. At present, the main body of piglet electrical heating panels used in China are made up of plastic, rubber, FRP (Fiberglass-Reinforced Plastics) and so on. The heating materials and the adulating power switches of piglet electrical heating panels still consist of the electro-thermal wires and the diode switch in general electrical heating panels. Major objects of this study are to overcome the above drawbacks of old piglet electrical heating panels and to design a new one which should not be only very suitable in practice, but also fully satisfied with physiological demands of piglets, and which should be convenient for knocked-down and maintenance. Of course, high sensitivity to the power regulation is also indispensable for this new type piglet electrical heating panels. Then, we will prove its appliance effect in practice.Three experiments were carried out to design, make a new type of piglet electrical heating panel and to examine the appliance effect in practice.In the first experiment, we have designed, made and installed a new type piglet electrical heating panel. This new one has a dimension of 600x800mm, and is 30mm in height. Its outer covering is made up of FRP. There are some figures against sliding in the upper surface. The electro-thermal films and the electro-thermal lines that have rated power, SOW and 90W respectively, become the heating materials of the new type piglet electrical heating panel. The adulating power switches is a dimmer.In the second experiment, we have simulated a temperature environment of a hoggery inthe lab and have discovered the change of temperature at the different power levels.In the third experiment, equipments with different types were used for piglets during lactation period. (old type piglet electrical heating panel, new piglet electrical heating panel I , II, and an infrared ray lamp, 250 W.) A total of 24 litters Landrace sows were divided into 4 groups at random, and each group, that was 8 litters, used a kind of equipment. This part of study was intended to describe some behaviors of piglets on the panels and to record the state of growth and development of piglets through the observation on the 4 groups of piglets during the first 14 days of lactation period.The results indicated that: Under the condition of this study, the two type piglet electrical heating panels had significant advantage in power regulation, and so, piglets felt very comfortable for them, which meant the increase of piglet lying time in hovers. Moreover, the two new types of piglet electrical heating panels improved the welfare and health of piglets, and reduced the incidence rates of diarrhoea of piglets. Under the four different conditions designed in this study, new type piglet electrical heating panel I , II, old type piglet electrical heating panel, an infrared ray lamp 250W, the survival rates of weaning piglets were 98.53%, 95.71%, 92.65% and 84.29% accordingly. The mortality rates... |
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