The feeding rate of pregnant sows adopts the principle of “low before and after high”. It is based on the physiological characteristics of pregnant sows and the laws of embryonic growth and development. The metabolic function of pregnant sows is very strong, the utilization rate of feed is high, and the synthesis of protein is also strong. The same total amount of mixed ingredients is used to feed pregnant sows and empty sows respectively. The total increase of the former is significantly greater than The latter, after subtracting the weight of fetuses and their attachments from pregnant sows, still greatly exceeds the weight of pregnant sows. The growth of fetal pigs is slow and fast before growth, and the weight gain of fetal pigs accounts for about two-thirds of the total weight gain in the month before labor. Therefore, during the first month of pregnancy, sows should avoid feeding high-energy feed and increase the proportion of low-energy roughage so as not to cause embryonic death. For lean pigs, when fed with full-price pregnant sows, the first 30 days of pregnancy, the amount of feed should be controlled to be less than 1.8 kilograms, then to 80 to 85 days of pregnancy, 2 kilograms per day, prenatal During the first month, the daily feed volume increased to 2.2-2.5 kg. You can feed sows during the week before delivery. The daily feed volume is 3-4 kg (half a day or two before delivery) to ensure that there is enough nutrients for the fetuses. Need for growth and development. The specific feeding amount of pregnant sows is more importantly based on the sow's body condition and the nutrient concentration of the full-price mixture. The specific adjustment method can refer to the appendix to the 75th question according to the type of the sow. During pregnancy, especially in late pregnancy, sows should not be over-fat or over-skinny. Moderate body condition and over-slaughter sows not only waste feed, increase feeding cost, but often result in excessive accumulation of adipose tissue in the abdominal cavity. The oppression of the uterus affects the development of the fetus and produces weak piglets. It is also easy to produce dystocia, and postpartum is also prone to ill effects such as loss of appetite, lack of lactation, constipation, and too much loss during feeding. Slaughtered piglets, over-fed and over-fed sows are not conducive to the growth of the breast. Too thin sows produce weak piglets due to lack of nutrients that affect the growth and development of the pigs. At the same time, due to less weight gain of the sows during pregnancy, the body does not have enough nutrient reserves, resulting in insufficient lactation and affecting the growth and development of the suckling piglets. Sows are severely emaciated due to excessive consumption of body fluids, affecting normal estrus and breeding after weaning. In addition, at any time to ensure the quality of feed, should not be fed mold, deterioration, corruption, toxic and highly irritating feed, otherwise it will easily lead to miscarriage and stillbirth. In short, the amount of feed for pregnant sows is based on different varieties, with reference to the relevant feeding standards to determine; Second, adjust the amount of feed according to body condition. The use of unit limit bars to raise pregnant sows is an effective measure to control sow feed intake and body condition. If sow herds are raised, ground-feeding methods should be adopted to reduce the fight between sows and sows, so that each sow can eat the share of feed that should be obtained. The so-called ground-feeding method is to first clean the ground of the barn, and then spread the feed scattered on the ground. China Agricultural Network Editor

Maxillofacial Fixation

Maxillofacial fixation system -- micro-plate for cranial and maxillofacial fracture fixation, designed for the surgical treatment of maxillofacial trauma fractures, suitable for the forehead, nose, orbit, zygomatic, maxillary region, and pediatric craniofacial bones.

The system is an orthopedic surgical instrument for neurosurgical tools. The maxillofacial fixation system includes micro-plates, straight plates, L-shaped plates, T-shaped plates, Y-shaped plates, double Y-shaped plates, H-shaped plates for cranial and maxillofacial fractures. The product range is complete, covering three-dimensional titanium mesh, self-drilling rotary bone screws, anatomical orbital floor plates, orthodontic nails, etc. However, the facial anatomical structure is special, and the screw plate needs to be placed away from the fracture line and avoid important anatomical structures such as nerves and teeth roots. Therefore, the specifications of the screw plate system are required to be as diverse as possible in order to be used in different bone structures, such as different radian, length, and number of screw holes. The bone plates forcranial and maxillofacial fractures are mainly divided into 1.5mm, 2.0mm and 2.4mm systems.

Titanium (including pure titanium and titanium alloy) is the most common material for hard tissue implants. Its elastic modulus and tensile strength are higher than those of human bone, and it is better than other metal materials such as nickel-titanium alloy and cobalt-chromium alloy in terms of biocompatibility and corrosion resistance. Our maxillofacial plate is made of titanium, and the self-tapping screws are mainly made of titanium alloy.

Jaw fractures include maxillary fractures and mandibular fractures. According to whether the fracture trauma is exposed, it can be divided into open fracture and closed fracture. Trauma is the most common cause of jaw fracture, which usually includes hit, traffic injury, fall injury, firearm injury, and a few iatrogenic injuries. All are caused by external forces acting directly or indirectly on the maxillofacial region. With the popularization of motor vehicles, the proportion of jaw fractures caused by traffic accidents has increased year by year, which has become the main cause of jaw fractures. In addition, neoplastic lesions in the maxillofacial region often lead to pathological jaw fractures.

In summary, maxillofacial fixation system has been widely used in clinical maxillofacial surgery, plastic surgery and ENT, and has a relatively mature market.

Titanium Plate,Rectangular Plate,orthognathic surgery,oral and maxillofacial

Jiangsu Aomed Ortho Medical Technology Co.,Ltd , https://www.aomedortho.com