The two critical periods of feeding and management of pregnant sows are based on two critical periods of embryonic development.
The first critical period was the first month after the sow was pregnant. At this time, the fertilized egg is to be planted in different parts of the uterine horn, from the 12th to the 24th to the 30th day, and gradually forms the placenta. Before the placenta is not formed, the embryo is vulnerable to environmental and unreasonable nutrient stimulation. As a result, it leads to shedding and death. Therefore, during this period, pregnant sows should pay special attention to keeping quiet, avoiding mechanical stimuli (such as playing, kicking, squeezing, pressing, biting, etc.), high-temperature heat stress, and hyperthermia diseases, and avoid feeding mildew. Deteriorating, toxic, highly irritating or severely nutrient and high-energy feeds;
The second critical period is one month before the delivery of the pregnant sow. During this period, the growth and development of the fetus is particularly fast. The weight gain accounts for about two-thirds of the total period. The sow’s weight gain is very fast, and the nutrients required are significantly increased. . Therefore, we must pay attention to strengthening nutrition, ensuring feed quality, and appropriately increasing the amount of feed. We can increase the daily intake of 0.2 kg to 0.5 kg according to the body condition of the sow, so that the status of the pregnant sow will be upgraded from 3 to 3.5 points. , to ensure the full growth and development of fetal pigs and sows to store a certain physical capacity for breast-feeding after delivery. At the same time, avoid the above-mentioned adverse stimuli. Feeding pregnant sows with fresh nutrient-balanced feed is often overlooked by producers. If calcium and phosphorus in the feed are imbalanced or insufficiently supplied and vitamins are severely deficient, they will have serious adverse effects on the fetuses, and may even develop blind eye and body development. Incomplete phenomenon. Should not use rapeseed meal and cottonseed meal with sow and boar diets.
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