Changes

===Ionophores - Monensin, salinomycin, narasin===

===Ionophores - Monensin, salinomycin, narasin===

* The most popular drug group to treat avain coccidia, they have been developed from the fermentation products of ''Streptomyces'' moulds.

* The most popular drug group to treat avian coccidiosis, they have been developed from the fermentation products of ''Streptomyces'' moulds.

* They work by allowing an influx of sodium ions into the sporozoite, this leads to a water influx. The sporozoite uses up all its energy trying to restore its ion and water balance, eventually structural damage occurs and the organism dies.

* They work by allowing an influx of sodium ions into the sporozoite, this leads to a water influx. The sporozoite uses up all its energy trying to restore its ion and water balance, eventually structural damage occurs and the organism dies.

* They are particular useful for avain coccidiosis because:

* They are particular useful for avian coccidiosis because:

** They supress clinical and subclinical coccidia

** They suppress clinical and subclinical coccidia

** As the entire coccidia population is not destroyed it allows natural immunity to develop

** As the entire coccidia population is not destroyed it allows natural immunity to develop

** They reduce oocyst build up in the litter

** They reduce oocyst build up in the litter