How to calculate the expected date of the sow?

November 08, 2018

The sow averages 114 days of gestation. The simple and convenient way to estimate the expected date of sow production is to add 4 to the month of breeding and 6 to the day. For example, a sow is mated on May 10, and its expected date of birth is 5 + April 10-6, which is September 4th litter. There are also "three three three" to indicate that the month and date of the breeding plus three months, plus three weeks plus three days, according to this calculation, the expected date of birth is 5 + March 10 +37 +3 days, but also for September 4th litter.
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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JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , http://www.spgreenhouse.com