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Herd Movement Tools

Theileria risk management

NZ Map
  High risk
  Moderate risk
  Low risk
Fig 1. current tick distribution in New Zealand
Herd movement
If you are moving your herd from one area to another, this tool has been made to help predict the probability of your herd developing clinical cases of theileriosis. Use the answers from the following questions to plot onto the adjacent table. The table is colour coded:
  • Green; low probability of issues
  • Orange-yellow-brown; could face problems. Proceed with caution and seek advice over management of the stock.
  • Red; high probability of facing clinical disease. Seek advice immediately.
Fig 2






Probability of clinical cases of theileriosis
The area you are moving from is (Use Fig 1 Current tick distribution in New Zealand):
A. A positive Theileria property
B. In the high risk area for Theileria
C. In the moderate risk area for Theileria
D. In the low risk area for Theileria
The area you are moving to is:
E. A positive Theileria property
F. In the high risk area for Theileria
G. In the moderate risk area for Theileria
H. In the low risk area for Theileria
An example: herd movement from a high-risk area like Pukekohe to Taupo (Taupo is low risk on the map) risk area.  Starting at point B and moving along to H resulting in Green area.  This would indicate a low probability of facing issues. 
Returning stock
Stock out at grazing that will be coming back onto the farm could pose a risk or be at risk of Theileria depending on the situation on farm. If your stock is at multiple sites you will need to do an assessment for all groups. Use the answers from the following questions to plot onto the adjacent table. The table is colour coded:
  • Green; low probability of issues.
  • Orange-yellow-brown; could face problems. Proceed with caution and seek advice over management of the stock.
  • Red; high probability of facing clinical disease. Seek advice immediately.
The home farm is (Use Fig 1 Current tick distribution in New Zealand)

Fig 3. Probability of clinical cases of theileriosis in the home herd
Fig 3





The home farm is (Use Fig 1 Current tick distribution in New Zealand):
A. A positive Theileria property
B. In a high risk Theileria area
C. In a moderate risk Theileria area
D. In a low risk Theileria area

The grazing block is:
E. A Positive Theileria property
F. In a high risk Theileria area
G. In a moderate risk Theileria area
H. In a low risk Theileria property
Fig 4
Fig 4. Probability of clinical cases of theileriosis in the returning stock

If you are buying in replacements or are building a herd from multiple sources it is a lot more complicated to assess the risk of Theileria on your farm. There are likely to be multiple diseases that could pose a biosecurity risk to your farm so It would be of great benefit to consult a vet to discuss the risks and make a plan on how to tackle this.

These tools have been developed as an aid to predict the risk you face from seeing clinical cases due to cattle movements onto your property. It is entirely feasible that due to factors outside of your control you could still be affected by theileriosis.

For a print version of this tool click here