How to feed pregnant sows

In the process of rearing sows, the dietary variety has a single nutritional loss ratio, the feeding amount is too much or too little, the sows are prone to grow too fat or too thin, and the occurrence of estrus abnormalities, fewer litter size, excessive stillbirth, piglet survival rate Low issues. Tests have shown that high-energy diets can easily lead to an increase in the number of embryonic deaths and a decrease in the birth rate. Low energy diets can lead to birth. Weaning piglets have a significant reduction in post-partum lactation and weak postpartum lactation. Calcium deficiency or calcium deficiency in the diet for a long period of time can result in stillbirth, weak appetite, and lack of milk and sputum: lack of carrot or vitamin A prolific stillbirth, deformity and weak appetite. This shows that it is important to provide complete nutrition for pregnant sows. Different breeds and different types of sow feeding standards are different. General pregnant sows should contain digestive energy of 11:7 MJ protein 14%-15%, calcium 0.60%, phosphorus 0.4%, salt 0.32%, vitamin A3250-3300 international unit, vitamin D65 international unit, Vitamin E8 International Unit, Carotene 13 mg. During the gestation period, an average of 2 kilograms was fed, and the specific daily dose should be adjusted according to the gilt condition of the pregnant sow and the law of fetal development to ensure moderate body condition. For sows that are poorly fed after weaning, 10 days before breeding and 20 days after breeding. Feeding concentrates, especially feeds containing protein. After the body condition is restored, feed the green-based diet until 84 days after pregnancy, and then add more concentrate, but the nutritional level should be higher than the previous period. For sows that are born between sows and lactation, sows in the first trimester of pregnancy are mainly green forages. Afterwards, the concentrates are gradually increased. The proportion reaches the peak at about 84 days of pregnancy and then continues for a period of time. In the previous week, the concentrate decreased gradually. 3 days before delivery, concentrates are reduced to half. Pre-breeding sows with good body condition had lower levels of nutrition during the pre-pregnancy period, and the feed was concentrated on the 30th day of the second trimester.

Magnetic Bead Nucleic Acid Extraction Reagent

The magnetic bead method nucleic acid extraction kit is a high-tech product that combines biological science and nanomaterial science. It is a major breakthrough in my country's nucleic acid extraction and purification technology. . Magnetic bead method for nucleic acid extraction has incomparable advantages over traditional DNA extraction methods, which are mainly reflected in: 1. It can realize automatic and large-scale operation. At present, there are 96-well nucleic acid automatic extraction instruments, and the extraction time of one sample can be realized. The processing of 96 samples complies with the high-throughput operation requirements of biology, enabling rapid and timely response to infectious disease outbreaks, which makes traditional methods unmatched; â‘¡ The operation is simple and time-consuming, and the entire extraction process has only four steps , most of them can be completed within 36-40 minutes; â‘¢ Safe and non-toxic, no toxic reagents such as benzene and chloroform in traditional methods are used, and the damage to experimental operators is minimized, which fully conforms to modern environmental protection concepts; â‘£ Magnetic beads and nucleic acids The specific binding of the extracted nucleic acid results in high purity and high concentration of the extracted nucleic acid. According to the same principle as the silica membrane spin column, the superparamagnetic silica nano-magnetic beads are prepared after the surface of the superparamagnetic nanoparticles is modified and modified by nanotechnology. The magnetic beads can specifically recognize and efficiently bind to nucleic acid molecules on a microscopic interface. Using the superparamagnetic properties of silica-coated nanomagnetic microspheres, under the action of Chaotropic salts (guanidine hydrochloride, guanidine isothiocyanate, etc.) and an external magnetic field, samples from blood, animal tissues, food, pathogenic microorganisms, etc. The isolated DNA and RNA can be used in clinical disease diagnosis, blood transfusion safety, forensic identification, environmental microbial testing, food safety testing, molecular biology research and other fields. Magnetic bead nucleic acid extraction can generally be divided into four steps: lysis-binding-washing-elution. Genetic testing will surely become a new symbol of the development of the biological industry. The emergence of high-throughput, automated nucleic acid extraction methods will reduce the labor cost of genetic testing, make large-scale testing a reality, and make it possible for genetic testing to reach ordinary people.

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