Gribbles Veterinary offers a range of cost effective solutions to assist veterinarians monitor facial eczema (FE) risk, minimise incidence of the disease, check your management programme is working and assess the damage caused by sporidesmin ingestion.
Monitor spore counts:
A national FE spore count monitoring service is coordinated by Gribbles Veterinary during the summer months. If you or your local farmers perform spore counts, send them to us via email to firstname.lastname@example.org by 2pm each Thursday to be included in the weekly report. The report is emailed out to contributors and is also available on our website.
Protection measures include not grazing high spore count paddocks, feeding supplements, spraying pastures with fungicide, and treating animals with zinc. Zinc sulphate can be added to drinking water, zinc oxide given as a drench and zinc additives applied to feeds or given as a slow release bolus.
Assessing if sufficient zinc is being dosed into the water supply can be achieved by measuring the concentration of zinc in water. Collect a 50mL pottle of water from a well mixed trough and submit to your nearest Gribbles Veterinary laboratory for analysis.
Predict risk / Monitor management programme:
There are a variety of testing options that can assist determining if animals are at risk or to check that your management programme is working. It is recommended that 10 cows are selected to test for serum zinc and GGT 3-6 weeks after your management programme has started*. Our FE Check panel is perfect as part of any management programme – it checks for any signs of liver damage and determines if zinc levels are adequate.
|Spore counts||Paddock||>20,000/g of pasture – preventative treatment required |
>40,000/g of pasture – toxic range, control measures required to limit damage
|Faeces||Sheep: >600,000/g of faeces – moderate challenge is occurring|
Cattle: >75,000/g of faeces – preventative measures required
|Zinc concentration||Serum||18 – 34 µmol/L to be protective|
|Faeces||Water200 mg/kg of fresh faeces to be protective|
|Water||60 – 230 mg elemental Zn/L to be protective|
|GGT concentration||Serum||<75 IU/L – no effects of sporidesmin on liver (see below)|
Gamma-glutamyl transferase (GGT) is produced by bile duct epithelial cells damaged by sporidesmin ingestion. Collect serum samples from animals suspected of being affected by sporidesmin and measure GGT levels. If prevention and protection measures haven’t succeeded, a guide to the degree of biliary damage is provided by an increase in GGT concentration: mild (100-300 IU/L); moderate (300-800 IU/L); and severe (800-1000 IU/L).
Testing options available:
- FE Check panel – 10x serum GGT and zinc
- Spore counts – pasture and faeces
- GGT – serum / Zinc – water, faeces or serum
*Facial Eczema – Management for New Zealand dairy herds, Dairy NZ, Verkerk G, Cullen N. Managing facial eczema. Dairy NZ technical series, Issue 8, 2-8, Feb 2012