Figure 10-1 lists the conditions that may be observed and the times when they are likely to occur, from birth through to the adult animal and indicates whether or not there is a generalised effect on the pig. Note that there are only five major diseases that have any economic significance; greasy pig disease, mange, necrosis, sunburn and the vesicular diseases.

Recognition commences by clinical observations across the herd. The following need to be considered:

• What proportion of pigs are affected?
• What age group is affected (refer to Fig.10-1).
• Is there a generalised illness associated with the condition and can this be related to a specific disease?
• Has the condition appeared suddenly or is it one that has been present in the herd for some time?
• Have you seen the condition before and can you recognise it? If not it may be advisable to consult your veterinarian or refer to the photographs.
• Do the pigs recover without treatment?