Grass Sickness Risk Calculator

Gucci_b

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This page is intended only as a guide. It is not designed to replace your Veterinary Surgeon's expertise.

Please note - if I assess my horse using this method he is almost always in the moderate to high group, because of where I live and the fact that he is grazed full-time in summer. However, I feel that because of his age and lack of stress, the risk of GS is fairly small and I don't change my management of him. If your horse is younger and recently stressed, or his field has had another recent case of GS, perhaps you should take more notice!




The first step in avoiding Grass Sickness is evaluation of the risk
Known risk factors are either weather or animal-related.

1. Weather-related risk
Keep a weather record
You will need a Min/Max Thermometer kept out of doors, in shade. At the same time every day, eg 9am, read the Max and Min temperature and work out the reading half way between these, giving the Mean Daily Temperature. Don't forget to reset the thermometer. Also, record the previous 24 hours on DRY (no rain or a few light showers) or WET (heavy showers or persistent rain).

Weather Record Table
(make your own continuation rows) Date Mean Daily Temperature Wet Dry
< 7°C 7 to 11°C > 11°C
eg 1.5.00 X X
etc

HIGH-RISK Weather
During DRY weather, if the mean daily temperature has been in the range 7 to 11°C for more than 10 days, GS risk is very high.




2. Animal-related risk
Individual horses or groups of horses or ponies may be assessed as being in High, Moderate or Low Risk categories

Score Your Score
Age < 6 months 0
6 months - 7 years 3
> 7 years 1
Grazed or Stabled solely grazed 5
solely stabled -4
part grazed/part stabled 1
Time on premises < 2 months 5
> 2 months 2
Has GS occurred
here in the last
5 years? Yes 5
No 2
Time of Year July-March 0
May 2
April or June 1
Total Score


Animal-related Risk
Overall Score Risk
12 or more High
7 to 11 Moderate
6 or less Low




3. Evaluate your risk

Weather-related Risk Animal-related Risk Precautions
High High Stable if possible. Avoid movements,
food changes or stress
Moderate
High Low Stable at least part-time, if possible
Avoid stressful events
Low High
Low Low Normal good management practices



Remember that other diseases, especially various types of colic, may produce similar symptoms to those seen in grass sickness. Always consult your Vet if you are at all worried about your horse's health.

Information in this page was taken from the Leaflet "Grass Sickness Risk Assessor"



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Anyone requiring more information about Grass Sickness or wishing to contribute to Grass Sickness Research should contact:

Equine Grass Sickness Fund
Moredun Foundation
Pentlands Science Park
Bush Loan
Penecuik
Midlothian
EH26 0PZ
Tel: 00 44/0 131-445 6257/445 5111
Fax: 00 44/0 131-445 6235
 
Thanks for this but it would be useful if you posted the link that this has come from as the page breaks have not come out right (when I read it anyway) so I can't actually work out all the data needed or scores. Thanks
 
personally grass sickness can hit any horse at anytime...i lost 2 several years ago...one a rather thin clyde mare, just purchased, with a foal at foot, purchased in feb, with me for only 3 weeks....vet said stress would have bought it on.....the other was a 2yr old that i bred, had always been in the same field since birth, nothing changed from his routine, he was fine when checked in the eve, found sweating and trembling at breakfast, passed away by 4pm.
 
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