In order to improve the embryo implantation rate of pregnant sows and to improve the feed intake of sows during lactation by controlling the body condition of pregnant sows, we have adopted a “limited feeding†feeding mode for pregnant sows. The design of pregnant sows is actually a difficult point. On the one hand, the nutritional needs of the sows in the early, middle and late stages of pregnancy are different. The sows who have re-pregnancy after the lactation nutrient consumption have different body conditions. The standard to feed pregnant sows is clearly inappropriate. Due to the limitations of practical operations, different feeding amounts are generally used to cope with the nutritional needs of pregnant sows at different nutritional stages. On the other hand, there is a misunderstanding of the feeding mode of the “feeding restriction†for pregnant sows. The damage of the subsequent reproductive performance of sows caused by “improper feeding restrictions†has become more and more serious, which should cause The attention of pig operators.
The degree of "feeding" of pregnant sows is generally judged by the score of the maternal condition. Of the traditional 5-point scoring criteria, a 3-point body condition was considered appropriate. At present, the pig industry should pay attention to the new understanding of “improper feeding restrictionâ€. “Inappropriate feeding restriction†is not necessarily expressed by body condition indicators. It may be due to insufficient deposition of body fat, and “thickness of back fatâ€. In fact, it is also possible that nutrient formulas and nutrient concentrations do not take into account the nutritional needs of pregnant sows in the case of “limited feedingâ€, so that the supply of nutrients related to the normal expression of reproductive performance and immune function is insufficient. It is because it is not necessarily expressed by insufficient thickness of the back fat, which is easily overlooked by the breeder. Therefore, breeders and nutritionists need to have a new understanding of the harm caused by the insufficient supply of special nutrients in the sow during the gestation period.
Insufficient supply of protein and special nutrition in the sow during pregnancy, in addition to affecting the development of the fetus, it is particularly important to pay attention to the nutritional support needed for the sow immune response. In the current situation of raising pigs, sows are forced to bear the burden of excessive immunity. There are more and more types of vaccines for pre- and pre-natal injections of sows. Feeders and nutritionists do not pay enough attention to the nutritional support needed to provide an immune response to the sow. This may be one of the reasons for the decline in the overall health of the herd.
In addition, the sows fed during the pregnancy period, due to the small amount of feeding, the long-term filling of the gastrointestinal tract by the eaten chyme is not conducive to the peristalsis of the intestines, and it is easy to produce sow constipation. On the other hand, Affect the sow's feed intake during lactation, so pay special attention to the supply of fiber feed in the feed formulation of the sow during pregnancy.
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