In order to increase the embryo implantation rate of pregnant sows and also to increase the feed intake of sows during lactation by controlling the body condition of pregnant sows, we adopted a “feeding restriction†feeding pattern for pregnant sows. The design of pregnant sow material is actually a difficult point. On the one hand, the nutritional needs of the sow during the first, second and later stages of pregnancy are different. The sow's body condition after re-nutrient consumption is different. The standard for feeding pregnant sows is clearly inappropriate. Due to practical operation restrictions, different feeding amounts are generally used to meet the nutritional needs of pregnant sows in different nutritional stages. On the other hand, there are misunderstandings in the feeding mode of the “restricted feeding†of pregnant sows by breeders. The damage to the sow's subsequent reproductive performance caused by “improper feed restriction†has become more and more serious. Pigger's attention.
The degree of "feed restriction" of pregnant sows is generally judged by the score of the mother's condition. In the traditional 5-point scoring system, a 3-point body condition was considered appropriate. The current concern of the swine industry is a new understanding of "improper feed restriction." The "improper feed restriction" may not necessarily be reflected by body condition indicators. It may be due to insufficient body fat deposition and "back fat thickness". In fact, it may also be because nutrient formulas and nutrient concentrations do not take into account the nutritional needs of pregnant sows under the condition of “feed restrictionâ€, and the supply of nutrients related to normal expression of reproductive performance and immune function is insufficient. It is because it is not necessarily represented by insufficient thickness of back fat and is easily overlooked by breeders. Therefore, breeders and nutritionists need to reconsider the harm caused by insufficient feeding of special nutrients in the body during the gestation period of sows due to restricted feeding.
Insufficient supply of protein and special nutrients in the sow during pregnancy, in addition to affecting the development of the fetus, is currently particularly concerned about the nutritional support needed for the sow's immune response. In the current state of pig rearing, the sows were forced to bear the burden of immunization of overweight herds. There are more and more types and times of vaccines for sows that are given pre- and post-partum injections. Feeders and nutritionists do not pay enough attention to the nutritional support needed for the sow’s immune response. This may be one of the reasons for the decline in the overall health of the herd.
In addition, the sows fed during the term of pregnancy, due to the small amount of feed, eaten restaurants have insufficient filling of the gastrointestinal tract for a long period of time. On the one hand, it is not conducive to peristalsis of the intestine and is prone to sow constipation. On the other hand, Affecting the increase in feed intake during lactation of sows, special attention should be paid to the supply of fibrous feed during the sow pregnancy feed formulation.
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