Disease patterns vary according to the season. Newcastle Disease is more serious during the dry season. In Thailand, Pasteurellosis, Coryza and streptococcal infections also occur more frequently in the dry season, and Fowl Cholera, Colibacillosis and Pseudomoniasis in the rainy season (Thitisak, 1992).
In northern Nigeria, where Sa’idu et al. (1994) studied 522 cases involving 8 800 chickens, ND accounted for 30 percent of all cases.
Of these, 38 percent occurred immediately before the dry season of October to December, and only 10 percent during the rainy season of July to September.
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As for Fowl Pox, more outbreaks occurred in the rainy season and were highest in the month of July, and about 60 percent of the outbreaks affected young chicks.
In Thailand, Thitisak et al. (1989) noted that a catastrophic mortality had occurred in March in both 1987 and 1988, this being the late dry season when early storms cause sudden drops in temperature which chill the birds.
They also found that chickens under two months of age (normally a rapid growth-rate phase), and those over six months of age (in the process of becoming sexually mature) were more susceptible to infectious diseases.
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