What are the simple methods for identifying sick pigs?

1. Look at the eyes. A healthy pig has bright, spirited eyes; if a pig's eyes are dim, red, or have excessive eye discharge, it is a sign of illness.

2. Look at the skin. A healthy pig has smooth, rounded skin and full muscles; if the pig's skin is rough and hard, lacks elasticity, or has swelling, ulcers, red spots, or festering patches, it is a sign of illness.

3. Look at the coat color. A healthy pig has a glossy, lustrous coat; if the pig's hair is rough, hard, lacks elasticity, and is messy, it is a sign of illness.

4. Look at the snout disc. A healthy pig has a moist snout disc with beads of sweat; if the pig's snout disc is dry with no sweat beads and a large amount of mucus flows from the nostrils, it is a sign of illness.

5. Look at the movements. A healthy pig constantly wags its tail and can respond quickly and nimbly to external stimuli. A healthy adult pig is greedy for food and fond of sleep. If food is given, it comes at the call, lies down and dozes after eating its fill, and when a stranger approaches, it stands up, raises its head, and keeps wagging its tail. If the head and tail droop, it is a sick pig.

6. Look at the neck. A healthy pig moves its head and neck freely with no swelling or hardness; if the pig's head and neck do not move freely or show swelling and hardness, it is a sign of illness.

7. Look at the breathing. A healthy pig breathes normally 10-20 times per minute; if abdominal breathing is too fast or too slow, it is abnormal.

8. Look at the tail area. A healthy pig has a clean anus with no feces; if the pig's anus and its surroundings, or even the tail, are stained with loose feces, or the rectum protrudes from the anus, or the tail droops and does not move, it is a sign of illness.

9. Look at the posture. A healthy pig mostly sleeps on its side and breathes with thoracoabdominal breathing (depending on the situation, abdominal breathing also occurs); if it sits in a dog-sitting posture and breathes with its mouth open, it is a sign of illness.

10. Listen to the sounds. A healthy pig makes loud, resounding calls; if the call is hoarse, it is a sick pig.