In general, sows do not eat piglets. But sometimes because the sows give birth, the placenta or the dead piglets are not cleared in time, they are eaten by the sows, and they develop the habit of eating piglets; or when the piglets of other sows are bitten into the pigsty, the sows’ teeth The blood of the piglets has tasted the taste of the piglet. Although it was not eaten at that time, it will develop the habit of eating piglets later; followed by feed nutrient insufficiency, especially extreme lack of minerals and vitamins, resulting in a kind of physiology Claim.
It is not easy to correct the sorrow of sows eating piglets. Ways to prevent sows from eating piglets: The main reason is to put the sow on the pig's mouth, or isolate the sow from the piglet and feed it regularly to keep the piglets out of the fence. The second is to strengthen the feeding of pregnant sows and lactating sows and to supplement the lack of nutrients such as protein, minerals and vitamins of sows. Remove the placenta and the dead pigs in time, so that the sows do not develop the evil of eating piglets. If it has become evil and difficult to correct, the sows should be eliminated in time to reduce losses.
Venlo structure is a popular one at present. This architecture uses horizontal girder as main bearer, forming a stable structure with columns. There is consolidation between horizontal girder and column, and hinge is used to connect column and foundation.
In Venlo greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. The steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using the hollow double-layer or multilayer PC board.
PC board is mainly made of PC/PET/PMMA/PP materials, it need sun screen coating to resist ultraviolet resist and ageing, and it is also required to be anti condensation and antidrug.
As a kind of light material, use PC board can greatly reduce the weight of greenhouse structure, and corresponding reduced the size of the steel frame, which saving the cost of steel.
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