Changes

====Identification====

====Identification====

The adult ''O. ostertagi'' worms are thread like, reddish worms with short buccal cavities. The males can measure 6-8mm, the females 8-9mm. There are several [[Nematode Structure and Function|cuticle morphologies]] used to identify these worms at a microscopic level. The anterior cuticle has transverse striations, where as the rest of the body has longitudinal ridges. Male spicules are brown and curved, they split at the posterior to form 3 hooks. In the females the tail tapers to a fine end with a rounded tip and the vulva is covered by a cuticular flap.

The adult ''O. ostertagi'' worms are thread like, reddish worms with short buccal cavities. The males can measure 6-8mm, the females 8-9mm. There are several [[Nematode Structure and Function|cuticle morphologies]] used to identify these worms at a microscopic level. The head of both sexes is square and the adults have 16 gut cells. The anterior cuticle has transverse striations, where as the rest of the body has longitudinal ridges. Male spicules are brown and curved, they split at the posterior to form 3 hooks. In the females the tail tapers to a fine end with a rounded tip and the vulva is covered by a cuticular flap.

==== Life-Cycle ====

==== Life-Cycle ====

====Epidemiology====

====Epidemiology====

The epidemiology of ''O. ostertagis'' varies in different regions due to the humidity, temperature and rainfall of the environment.

The epidemiology of ''O. ostertagis'' varies in different regions due to the humidity, temperature and rainfall of the environment.

Causes [[Ostertagiosis - Cattle|Ostertagiosis]]

Causes [[Ostertagiosis - Cattle|Ostertagiosis]]