1, the reliability of provenance Purchase should go to breeding farms with large scale, strong technical force, complete infrastructure, strict production and management, perfect service measures, good reputation, and no outbreaks. 2. Typical characteristics of appearance The binary sow's heredity retains many of the typical appearance characteristics of the crossed parents, mainly in the shape of the head, ear size and ear angle, face concave and convex, tip blunt mouth, body length, height and thickness of the limbs. Hair coat density and hair, skin color, back width, abdominal curvature, etc., these typical characteristics are the basis for inferring the quality of hybrid parents and identification of the quality of the sow. Therefore, it is necessary to understand the appearance characteristics of the dual sows that are crossed by different parents. 3, physical and physical health Should pay attention to normal body condition, body shape, body, front, middle and back parts of the transitional connection of natural; hair shiny, soft, flexible; skin elastic, no wrinkles, but thin, not slack; physical health, lively, Rapid response to external stimuli; mouth, eyes, nose, excretory holes without abnormal fecal adhesions; no eye blinking, lameness, trauma; no abscesses, scars; no phlegm, hernia and heterophilia. If the body size is small, the individual size is obviously different, the physique is thin, and the rough hair is upside down, etc., it is likely that there are genetic factors of quality, or the growth and development are poor, or there is a parasitic disease, or there is a potential disease, or in the early stage of the disease. Poor or poor feeding management and bad habits. For these two sows, there can be no flirtation or blind confession, thinking that there is not much impact at the moment or trying to get better by treatment. 4. Particularities of breast, nipple and body shape The sows of the binary cross sows should be well developed, well-arranged, well-proportioned, and appropriately spaced at right and left intervals. The number of effective nipples is 7~8 pairs, no less than 7 pairs, no dummy nipples, no papillae. The back is straight and wide, full of muscles, no depressions or bends. The ventral line is flat and slightly curved. It should not be too sagging or curling. It should be elastic and not loose. The abdomen should not be enlarged on either side of the abdomen. All limbs are solid and upright, and sows with irregular limbs are not suitable for planting. The hips are closely related to the development of the pelvis and reproductive gas pipelines and can be used as a basis for judging reproductive function. The legs are required to be wide, flat, long, and slightly inclined; the pus is well developed, normal in shape, large and obvious. 5. Suitability of body weight and inhibition of childbearing age The difference between body weight and childbearing age is manifested in poor quality of breeds, small individuals, weak constitution, slow growth rate, and diseases. Individuals are small and have a short childbearing age. Potential problems have not yet been exposed or are not easy to observe. They are sensitive to stress responses to transportation and environmental changes, and are detrimental to future growth and even cause death. On the contrary, individuals are too large, which increases the cost of investment and is not economically advantageous. Therefore, the purchase of gilts to 60 kg ~ 60 days of birth weight of about 30 kg as a basic reference index. 6. Effectiveness of epidemic prevention, deworming and feed palatability Detailed information on epidemic prevention, deworming, and feeding management should be asked in detail. In particular, attention should be paid to asking about the response to the epidemic and the deworming effect. Although these two factors have been affected, they may not have achieved the intended purpose. According to the circumstances of the inquiry, there must be targeted supplements. Don’t be negligent. Sudden changes in feed types, feeding methods, or times can often lead to indigestion or gastrointestinal diseases. Attention should be paid to the main conditions of feeding and management such as dietary composition, daily feed volume and frequency. 7. Completeness of procedures for sow card, quarantine certificate and receipt document These three are like the “manualsâ€, “certificatesâ€, and invoices of commodities, and many buyers have insufficient knowledge of whether there are three or not. This is the most useful material when unexpected problems and contradictions occur on the one hand and protection and resolution are required. On the other hand, through the sow card, not only can kinship be understood, inbreeding can be facilitated, breeding programs can be developed, and inspections can be carried out No. To see if the sow card record content matches the actual age and weight introduced by the farmer, it is possible to initially grasp the quality and growth of the pig breed, and to reflect the level of farm management. In order to prevent and avoid unexpected troubles, we must take the initiative to accept the quarantine of the animal department and obtain the quarantine certificate. 8, the thoroughness of the transportation process It is necessary to make arrangements for personnel, vehicles, time, and road traffic. Transport disinfection to prevent the spread of pathogens and diseases. Should pay attention to avoid wind, rain, snow and other bad weather, in early winter, select high temperature during the day of transport, in summer to avoid the noon high temperature hot weather, choose to transport in the morning or evening. Before the morning departure, we should not feed too much, but we must not feed them. Most products of Fluorine-Containing Benzaldehyde are a pale yellow liquid. They are playing an important role in fine chemical intermediates, is used as the main raw material for the synthesis of a variety of pesticides, pharmaceuticals, surfactants, polymer monomer mildew. As used in medicine synthesis antihypertensive drugs, antipyretic analgesic anti-inflammatory drugs, anti-cancer drugs, muscle relaxation drugs for synthesizing fluorine cypermethrin, fluorine chlorobenzene daisy cool in pesticides, fluoride and styrene, wherein the polymer of styrene monomer to fluorine can be widely used in the manufacture of the recording material, a thermoplastic resin coating, liquid crystal materials. Currently new miticide is effective pesticide products which is the main raw material of Fluorine-Containing Benzaldehyde. Fluorine-Containing Benzaldehyde Containing Benzaldehyde,5-Dichlorobenzaldehyde,3-Bromo-5-Fluorobenzaldehyde Taizhou Volsen Chemical Co., Ltd. , https://www.volsenchem.com