Scours around weaning are sometimes blamed on the new feed before anybody looks further. A ration change can affect manure, but coccidiosis is also a recognised disease risk in older calves, often around weaning.
Stress, crowding and contaminated environments can help clinical disease appear in susceptible animals. The signs can overlap with other causes of diarrhoea, which is why an online article cannot diagnose the mob.
Producers should know the warning signs of coccidiosis, keep yards and trough areas as clean as practical and involve a veterinarian when calves are sick, dehydrated, passing blood or losing condition. Early attention protects both animal welfare and the feeding program.
Coccidia are microscopic protozoan parasites. Low-level infection can occur without obvious disease, but susceptible calves may develop clinical coccidiosis when parasite challenge and stress overwhelm their defences. Weaning often combines several potential stressors, including separation, mixing, transport, yarding and dietary change. Crowded, wet or manure-contaminated areas can increase exposure.
Feed and water points can become high-traffic zones, so good drainage, cleanliness and reducing faecal contamination matter. Reducing unnecessary stress and keeping cattle on a steady nutritional plane can support general resilience, but they do not replace disease control.
Possible signs of coccidiosis include diarrhoea, mucus or blood in the manure, straining, reduced appetite, weight loss, dehydration, dullness and calves hanging away from the mob. Not every affected animal will show every sign, and other diseases or nutrition problems can look similar.
A veterinarian may use the history, clinical examination and laboratory testing to work out the cause. Faecal results also need to be interpreted properly because coccidia can be detected in healthy cattle as well as sick animals.
Do not assume that scours automatically proves coccidiosis, or that a feed additive will treat a seriously ill calf.
| Observation | Why It Matters | Action |
| Loose manure only | Could have several causes | Monitor closely and review recent changes |
| Blood, mucus or straining | Stronger disease warning | Contact a veterinarian promptly |
| Dullness or dehydration | Animal may be systemically unwell | Seek urgent assessment and supportive care advice |
| Multiple calves affected | Possible shared exposure | Review yard hygiene, water, feed and health plan |
| Rapid weight loss / off feed | High welfare and performance risk | Do not rely on feed alone |
Coccidiosis prevention starts with managing the whole weaning environment, rather than relying on one intervention. Keep feed and water areas clean, avoid overcrowding, maintain drainage and reduce the number of major stressors landing at once. Remove manure build-up where practical and avoid moving healthy calves through heavily contaminated pens without a hygiene plan.
It can also help to keep a consistent feeding routine and monitor cattle closely during the transition period. Producers can refer to the Complete weaner nutrition guide for broader guidance on managing nutrition through the weaning stage.
Work with a veterinarian on a property-specific prevention and treatment plan, including the correct use of registered products and sensible timing around weaning.
Maxi Weaner contains sodium monensin and the product information states that it assists with coccidiosis control when used as directed. However, coccidiosis control is not the same as diagnosing or treating every case of scours. A seriously ill calf still needs appropriate assessment and veterinary care.
For more information on the feed itself, producers can refer to the Maxi Weaner product page.
Keep records of affected animals, dates, recent movements and ration changes so the veterinarian has a useful history. Always follow the current product label, prevent access by non-target animals and seek veterinary help when clinical disease is present.
Regular observation can help identify problems before they become a larger mob-level issue. Watch for changes in manure consistency, appetite, behaviour, water intake, body condition and growth. Keeping simple records can also make it easier to identify whether a problem appeared after a particular management change.
For practical guidance on tracking cattle performance and feeding response, see the Monitor a weaner feeding program guide.
No. Diet change, worms, bacterial or viral disease and other problems can cause diarrhoea. Veterinary assessment and testing may be needed to determine the cause.
Yes. Coccidial organisms or oocysts may be found without clinical disease, so test results need to be interpreted alongside the animal’s signs, history and overall condition.
No. Registered feed additives may assist with coccidiosis control when used according to label directions, but sick calves still require diagnosis and appropriate veterinary care.
If multiple calves are affected, review recent feed changes, water access, hygiene, stocking density and other management changes.
Where calves are dehydrated, passing blood, losing weight or becoming dull, seek veterinary assessment promptly.
Coccidiosis can become a concern around weaning when stress, exposure and environmental contamination combine. Watching cattle closely, maintaining clean feeding and watering areas and reducing unnecessary stress can all support better management.
Most importantly, do not assume every case of post-weaning scours is caused by feed or coccidiosis. When calves show significant clinical signs, veterinary assessment is the safest way to identify the underlying problem and decide on appropriate treatment.
Contact Maxwelton Feed & Grain with your cattle numbers, average liveweight, available forage and growth targets. The team can help you discuss a practical feeding option for your conditions.
Talk to the Maxwelton Feed & Grain team.
Feeding requirements vary between cattle, properties and seasons. Follow current product directions and seek qualified livestock-nutrition or veterinary advice where required.
For advice on feeding rates, product selection, or choosing whether Maxi Grower, Maxi Calf or Maxi Weaner is the right fit for your cattle program, contact Maxwelton Feed & Grain.
Phone:
Andrew Pauli: 0429 442 627
Alison Pauli: 0427 129 381
Email: admin@maxwelton.com.au
Location: 18 School St, Maxwelton, Queensland 4822
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