It also damages the lining of the abomasum causing inflammation and reduced absorption of nutrients. The stomach hair worm, Trichostrongylus axei, is the last of the common abomasal nematodes. This results in the characteristic ‘bottle jaw’ appearance with affected cattle being weak and slow to move. This blood sucking parasite also inhabits the abomasum and causes severe anaemia and loss of protein. The Barbers Pole worm, Haemonchus placei, thrives in the warmer climates of NSW and QLD. This type of disease can cause significant losses in young heifers as the worm larvae emerge. This parasite can enter an arrested phase of its lifecycle which can then resume 3-9 months later. Cattle up to 18 months old can be affected. Infected heifers have a severe scour, inappetence, anaemia and weight loss. The small brown stomach worm, Ostertagia ostertagi, penetrates the lining of the abomasum (fourth stomach) causing severe damage and inflammation. Tapeworms play a minor role and flukes cause significant economic losses in some geographic areas. The nematodes are the most economically important internal parasite of cattle. Within each group, the life cycles and growth of the parasites are generally very similar and different from those of the other two groups. ![]() They are assigned to one of these groups according to their structure. Gastrointestinal worms in cattle are divided into nematodes (round worms), cestodes (tapeworms) and trematodes (flukes). This article discusses the common gastrointestinal worms and how they can affect cattle, especially young stock. As we come to the end of winter and spring approaches, it is time to think about how the change in season can affect the burden of internal parasites in weaned stock.
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