Sows and sows used the same feeding standards and feed formulas. It is difficult to meet the nutritional needs of high-yield sows. The amount of lactation was significantly reduced after 8 to 10 days of postpartum sow production, which was attributed to insufficient breast milk. Why the problem of lack of breastmilk is revealed in the first 10 days of sow production, mainly due to the small body weight at the time of breeding and the lack of basic nutrient reserve. In addition, during the feeding phase of late pregnancy, the amount of feeding is reduced due to concerns about the difficulty of giving birth to the newly born sows, which leads to excessive consumption of basic nutrient reserves in advance, and low postpartum gilt intake (less than 5 kg). Giving special trophic protective strategies to newly born gilts will soon result in the problem of insufficient breast milk in the first born sows.
The consequence is that the continuous production capacity of the sow is destroyed; if there is a problem with the feeding of the primiparous sow, the result will be shown during the post-production stage. The author observed that the average number of litters on many pig farms is low, and many people think that it is an issue of estrus and breeding. But what is the essence of the reproductive problem? In fact it is the performance of sow system capacity.
Feeding strategies for gestating sows at the beginning of production. In the actual feeding process, most of the newly born sows are reared in the same manner as the sows, which is not good for the first sows. Because the thickness of the P2 backfat is in the normal range of 18-22mm after gilt breeding, no more energy is needed to increase the reserve of backfat; the thickness of the P2 backfat has been reduced to below 18mm after weaning sows are weaned. Therefore, sows in the gestation stage require higher energy to increase the thickness of P2 backfat. In the gestation stage of sows, they need to consume 30.12 to 31.38 MJ of metabolic energy per day. The amount of feed is more than 2.5 kg in order to ensure the recovery of P2 backfat; the newly born gilts consume 27.20 MJ per day. This is enough, and the amount of feed is about 2.25 kilograms. It does not need to provide extra heat to restore the reserve.
The gestation stage of the first-time sow needs to strictly control the amount of feed. A study at the University of Nottingham showed that if the gestating primordial primordial phase can not strictly limit the feeding, it will lead to a serious decline in the intake of sows during lactation, and the problem of the second stage of production will be more serious.
Feeding during the second trimester (starting at 100 days after pregnancy), feeds 3.0 kg of feed every day during lactation.
Feeding strategies for first-time sows during lactation. Primary slaughter sows should adopt completely different feeding strategies than the sows. It is recommended that pig farms provide special, high-standard lactation sows for first- and second-born gilts. According to the standard of total daily nutrient intake during the lactation period of high-yield sows, the metabolic energy of the first lactating sows during lactation should not be lower than 13 to 39 MJ/kg, the crude protein should not be lower than 18.0%, and the lysine should be as high as 1.2. %, that is to say the balance of other amino acids in the formula should be based on the ideal protein level in the state of lysine 1.2%.
The number of litters in the first born sows. In fact, many pig farms are concerned about the small size of the newly born sows and their ability to take them. Therefore, in the process of arranging the larvae, it is intended that the primiparous sows will not be brought to 12 piglets. This will sacrifice the mothers. The ability of pigs to carry piglets, due to the initial birth of the younger ones, impaired the development of the sow's breasts, and reduced the ability of the pigs to become pregnant after the second birth.
Management measures after weaning. For gilts who have too much weight loss, excessive backfattage, and severely damaged basic nutrient reserve after the end of lactation, the first estrus can be fed with the first estrus and the high standard nutritional feed can be used for 21 days. The two estruss are mated again. Allow the back to meet the requirements of mating (18 to 22 mm) or almost to the mating requirements. Studies have shown that this practice allows the sow to produce 1.5 to 2 piglets more productively, and it is also very beneficial to restore sow's reproductive capacity.
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