I don't understand the theory that is too advanced. It is only 12 years of experience in raising pigs that tells me that if the production is good, the sows must be well managed and need to be humanized to treat the sows.
During lactation, the sows eat 4-6 kg of feed per meal, and suddenly drop to 2 kg after weaning. If it is you, will you be hungry? Therefore, when we raise pigs to consider scientific management of production, we also need to consider the feelings of sows.
Usually, the sows will soon be estrus after weaning. The average time of estrus is 7 days after weaning, the earliest is 2 days, and the latest is 17 days. The sow is postponed or not estrus after weaning. It is also called the sow after weaning. It means that the sow cannot be naturally estrus within 20 days after weaning, and even if it has not appeared for more than 30 days, the sow has not been used for a long time. There is another estrus. This is a common reproductive disorder problem in the current lean meat variety and its binary hybridization, and it is more prominent in large-scale pig farms. In recent years, some farms have used hunger stimulation measures to stimulate sows' estrus. The sows are not fed or 1-2 days after weaning. The sows estrus quickly after hunger stimulation, and return to normal rearing immediately after breeding. However, this practice will reduce the breeding rate of the sow and the conception rate will not be too high.
Think about it, hunger itself is a big stress, at this time the sow will be restless and screaming to express emotions. Just like human beings, women who have given birth to children know that postpartum mood swings are large and easy to get irritated. This is because all kinds of hormones in the postpartum body have not returned to normal, this stage is very easy to get angry, so as long as there is a small stimulus, it is easy to get angry. At this time, the sow feeding amount is reduced to 2 kg. Isn't it artificially irritating the sow? Feeding for 3-5 days, the sow has always maintained an angry sub-health state. Do you think about the various reproductive performance of the body? Can hormone levels be adjusted? Therefore, many large-scale pig farms will reflect the problems of low sowing rate and high return rate.
Of course, from a scientific point of view, weaned sows need to limit feeding and prevent sows from getting too fat without estrus. But can we have a compromise? Yes, it is very simple to replace the reduced 2 kg concentrate with green feed.
Our farm is feeding 2 kg of sweet potato vines and 2 kg of concentrate after weaning. Of course, there are also many people who grow grassy and weeds, which can be used as green fodder. This kind of diet can make the weaned sows have a good transition, because there are always chewy things in the mouth, the hunger is greatly reduced, and the stress is reduced. At the same time, the green feed has a certain effect on the peristalsis of the sow's intestines, reducing the constipation of the sows.
Feeding green fodder, there is a problem to be noted, the sow is more deworming; the pig potato vine is watered with biogas liquid, and there are more parasite eggs. Of course, the scale of the field, the supply of green feed is also a problem; just like our field, in order to solve the supply of the 12,000 sows of sweet potato vines, we invite people to plant sweet potato vines.
In addition to feeding the green feed transition, my younger sow, my request is not allowed to help the birth, not allowed to induce labor, because the fetus is about the same size as our hands, the hand can go in, the fetus can also come out. Young sows have midwifery or oxytocin, which is particularly harmful to the birth canal and is not conducive to the production of the next child. At the same time, each sow must be brought with 10 litters, which will ensure effective nipples and prevent some nipples from shrinking due to less use. It is important to know that sow lactation is actually a process of hormone excretion in the individual. If there is no pig sucking, then some hormones can not be excreted, accumulated in the body, discharged from the uterus, and various troubles will increase.
In addition, we have been performing weaning for 21 days. Some people may worry that early weaning will be detrimental to piglets and sows. After several years of practice, it is found that on the contrary, piglets are much better. Because after 21 days, the sow milk nutrition has basically not been able to supply the growth needs of the piglets, and all the maternal antibodies have disappeared. If you feed again at this time, the growth and immune resistance of the piglet will be affected. Therefore, the use of the teaching material is more beneficial to the health of the piglets, and the pigs in the nursery are much less. And 21 days for the sow uterus to rejuvenate, time is enough.
Slightly different from the conventional spring is that the spring itself is irregular, there are bending and a large number of complex angle design and manufacturing technology is relatively more demanding, equipment is also a more demanding general computer winding because of winding angle, bending more, so slow production speed because of its complexity, the production and processing of special-shaped spring can often represent a company`s technical level.
Special-shaped Spring and conventional spring is slightly different from the spring is the ability to be irregular, bending and a large number of complex angle design
Common Spring is divided into: Compression Spring, Tension Spring, Torsion Spring. Special-shaped spring, special-shaped spring is mainly the existence of complex spatial angle, irregular bending and so on.
The adaptability of the special-shaped spring is very wide. Common such as cars, machinery, daily hardware products on.
Stainless Steel Spring wire 301,302 or 304 stainless steel springs made of stainless steel are not recommended when the temperature exceeds 260 degrees Celsius (500 degrees Fahrenheit) .
Metal string materials when the temperature exceeds 121 degrees Celsius (250 degrees Fahrenheit) , do not recommend the use of musical instruments metal string, wire-based spring.
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