This is evaluated by following these simple steps:


Determine fecal egg counts from a group of horses grazing together.


Deworm these horses at the labeled dosage and route of administration of the anthelmintic product being evaluated.


Determine egg counts from the same individual horses at 14 days treatment.


Make an assessment of the percent reduction for the overall population; unless only a single horse is tested, do not make interpretations for individual horses of the group tested.


If the mean fecal egg count reduction falls below expected levels, the following steps are recommended:


Check storage conditions, expiration date, and dosage of the product administered.


Repeat the treatment and determine new fecal egg counts at 14 days post treatment. If the efficacy still falls below expected levels, it is strongly suggestive of anthelmintic resistance.


Choose a different anthelmintic class and repeat the exercise.


In case of documented resistance to all available drug classes, it is recommended to use the class with the highest observed efficacy.


11


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34