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Subscribe(Cooperia oncophora, C. pectinata, C. punctata)
Cooperia punctata, C. pectinata and C. oncophora are the most commonly found small intestinal worms of cattle of all ages. They are small worms 5-9 mm long, and very hard to see with the naked eye.
C. punctata and to a lesser extent C. pectinata, are the major species in northern warm regions with predominantly summer rainfall and often cause severe enteritis in calves when in large numbers. Recent research indicates the range of these two species is extending south with both species now regularly recovered from larval cultures in southern Australia.
By contrast, C. oncophora is distributed in more temperate regions with wet winters, where it is often the most prevalent worm in larval cultures. This species can affect weight gain, especially in younger animals. Cooperia species may contribute to the severity of disease in mixed parasite infections.
Cattle generally develop a strong immunity to reinfection by 12 months of age.
Resistance in all Cooperia species to the macrocyclic lactone drenches has been reported.
Further ecological information on worms and their control:
Small intestinal worms are found coiled along the wall of the small intestine.
C. oncophora affects weight gain, while C. punctata (and C. pectinata) may cause severe disease including diarrhoea, weight loss, inanition (exhaustion) and death, especially in young calves.
Clinical symptoms from infections with up to 30,000 worms consist of a loss of appetite, a listless appearance, and intermittent profuse watery diarrhoea, rapid loss of weight, emaciation, and death.
The only accurate way to confirm worm infections in cattle up to the age of 12 months, and before productivity losses have occurred, is to conduct a worm egg count (WEC). As small intestinal worm eggs are typically ‘strongyle type’, also request a larval culture or DNA test. The results allow you to determine the need for a drench or management action.
Worm egg counting does not always correlate well with the number of adult worms present for cattle over 9 months of age. For this age group observation of physical signs such as body condition scoring and monitoring target growth weights are good additional indicators to diagnose worm infections.
Figure 2. Section of a cleared preparation of an adult Cooperia spp showing part of the gut and uterus. Image courtesy of the National Centre for Veterinary Parasitology, ncvetp.org
If visible signs of worms are present in cattle, then significant production loss has already occurred. Also, these signs can occur with other parasites and diseases.
There are many options to treat for this worm and your choice of drench and management options will depend on:
Your decision can be assisted by referring to:
It is also important to consider non-chemical worm control methods, as simply removing the affected mob to a pasture that has undergone planned pasture management will reduce their re-infection risk.
You can also review the chemical groups and actives pages on this site to find out specific information about drenches, including their drench active, drench group, how they are administered, which worms they treat, resistance status, safety information and how they work.
The negative impact of this worm can also be reduced through using one of the integrated Annual Program for Cattle that have been specifically developed for different regions across Australia.
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