1, fresh meat: white in fat, shiny in muscle, even in red, slightly dry or slightly wet in appearance, and the depression pressed by fingers on lean meat can be immediately recovered, with good elasticity and normal smell peculiar to fresh pork.

2, not too fresh meat: less fat luster, slightly muscle color, dry appearance or some sticky hands, wet new section, depression can not be recovered immediately after finger pressing, poor elasticity, slightly ammonia or sour taste.

3. Deteriorated meat: the fat loses its luster, turns yellow or even green, the dark red part of the muscle is moist, the elasticity basically disappears, and it has a rotten smell. In winter, the temperature is low and there is no smell. By heating, burning or boiling, it will give off a rotten smell.

4. Water-injected meat: This kind of meat is lighter in color, or grayish red, and some are yellow. It is swollen and wet from the cut surface because it contains excess water. The case of selling water-injected meat was wet and the water accumulated seriously, indicating that the butcher was wiping it with a rag at any time.

5. Frozen pork rolls filled with water. Through the plastic film, you can see that there are gray translucent ice and red blood ice inside; After cutting, you can see that there are broken ice cubes and ice slag splashing out, and there will be a lot of oozing blood after the muscles are thawed. Cheap pork rolls are mostly minced meat mixed with pathological waste, so be careful when buying them.

6. Dead pork: The whole body congestion is purple, the fat is red, the muscle blood is dark red, and the blood vessels are full of dark red coagulated blood. After cutting off the large blood vessels inside the hind legs, you can squeeze out the black and red blood embolus and peel off the suet. It can be seen that there is a dark purple capillary network on the peritoneum. After cutting the renal capsule, you can see that the kidney turns green locally and has a rotten smell.

7. Pig dung worm meat: it is a larva with hookworm, which is bubbly in the lean meat of pigs. Macroscopically, there are vesicles as big as millet and pea, among which there is a white head, just like pomegranate seeds. Cysticercosis is also seen in the heart. Eating cystic meat can make people sick. If people swallow eggs indirectly, they will also get filariasis, with serious consequences.

8. Sick swine fever meat: The whole skin of the sick pig, including the skin of the head and limbs, has bright red bleeding spots of different sizes, and there is also a small amount of bleeding in muscles and fat. The lymph nodes of the whole body, commonly known as' meat dates', are all purple, and renal anemia is pale with bleeding spots. Individual butchers often soak the sick meat of classical swine fever in clear water overnight and sell it in the market the next day. The appearance of this kind of meat is particularly white, and there is no bleeding point, but when the meat is cut, the bleeding points in fat and muscle are still obvious from the cross section.

9. Erysipelas: Stagnation type, with square, diamond, round, plastic and protruding red bruises on the skin of neck, back, chest, abdomen and even limbs, commonly known as "striking fire marks".

10, septic swine erysipelas, the whole body skin is purple, and the chest, abdomen, head and limbs are purple, commonly known as "big red robe or little red robe". The lymph nodes of the whole body are swollen and red, and yellow liquid can be seen flowing out after incision. The kidneys are swollen, usually purple-black. Severe septic swine Dan disease meat, the whole body fat is grayish red or yellow, and the muscles are dark red.

1 1. Harmful gland: The thyroid gland is located behind the throat of pigs and below the trachea, and it is brownish red, such as jujube red, and sometimes it is left on the neck meat through slaughter. The thyroid gland contains hormones and will not be destroyed when cooked. People can cause toxic diseases after eating by mistake, such as nausea, vomiting, diarrhea, dizziness, headache, chest tightness, muscle and joint pain, rapid heartbeat and sweating.