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The term "Health" means different things to different people. Absence of diseases is clearly a prerequisite but in pigs it means more than that. It is a state of physical and psychological well-beings that allows the pig to express its genetic potential for maximising productivity, reproductive performance and lean meat production.

The term "disease" means an unhealthy disorder of body and mind, sometimes with pain and unease, that is likely to prevent the pig from exploiting its genetic potential resulting in lowered productivity.

The level of clinical disease is described by the term morbidity. Disease can be clinical (i.e. the affected pig shows clinical signs) or sub-clinical (the affected pig shows no obvious clinical signs). Sub-clinical disease can also have an adverse affect on productivity. You should distinguish between sub-clinical disease and sub-clinical infection,. Every healthy herd, without exception, carries a multitude of potentially pathogenic infections, mainly in the gut but also in the nose, throat, skin and genitals, which are not causing disease either clinical or sub-clinical.

There is a delicate balance between these potential pathogens and the pigs' immunity to them. Any physical or psychological disturbance of this immunity may render the pig susceptible.

疾病之謂，乃身心不適，有失調和之意，甚者或不免于疼痛與煩躁，此甚害于彘用其遺傳之潛力，致其生產不佳。

Thelevel of clinical disease is described by the term morbidity. Diseasecan be clinical (i.e. the affected pig shows clinical signs) orsub-clinical (the affected pig shows no obvious clinical signs).Sub-clinical disease can also have an adverse affect on productivity.You should distinguish between sub-clinical disease and sub-clinicalinfection,. Every healthy herd, without exception, carries a multitudeof potentially pathogenic infections, mainly in the gut but also in thenose, throat, skin and genitals, which are not causing disease eitherclinical or sub-clinical.

臨床疾病之等級表之于發病狀態。疾病或為臨床（病彘現臨床癥狀）或為亞臨床（病彘未現臨床癥狀）。亞臨床疾病亦可害于彘之生產。然于亞臨床疾病與亞臨床感染之際應有所察。每一康健之彘群概莫能外，皆伏有巨量可感染之病原，多集于內臟，鼻、喉、膚與生殖之具亦未可免，然未致于病，無論臨床與亞臨床。

Thereis a delicate balance between these potential pathogens and the pigs'immunity to them. Any physical or psychological disturbance of thisimmunity may render the pig susceptible.

畜牧人