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The focus of this article will be HERBICIDE USE AND GRAZING EQUINE.Herbicide use around the grazing horse is a potential for numerous pathological changes.(Babka,Masters Dissertation 2014,University of Edinburgh).There are about 70 different categories of herbicides used today with numerous commercial types in each category(Wood,2001).Each has a grazing restriction time period as demonstrated on the label of each herbicide.Most such as Roundup and others usually require a period of about 7 to 15 days before a horse can be put back on the field to graze.However,it was discovered that in loam soil the herbicides active ingredient can be detected in soil up to 180 days after application.This has the potential of augmenting the soils micro and macro nutrient levels as well as the soil Ph.In addition under varying conditions of moisture,the potential for development of fungus in the soil exists after herbicide application.Other changes in the soil after herbicide application was noted in the cation exchange capacity and soil organic matter content . Lowering the cation exchange capacity can result in loss of soil fertility and its ability to hold nutrients such as calcium,magnesium ,and potassium.In addition lowering the organic matter content can decrease the ability of soil hold water and nutrients as well  and lower the Ph buffer level.(Curran,W.2014).These changes can effect the horses ability to graze on quality fields and may lead to such conditions as glutteral pouch mycosis,hoof wall integrity and herbicide poisoning.It is important for the equine owner to do a soil test and decide if a herbicide has to be used on the grazing pasture.                                                                                                                                                                                                                                                            References:
Babka,April.(2014):Masters Dissertation,.University of Edinburgh,Scotland.  
Wood,A..(2001):Compendium of pesticides common names.Chem Control database.London.
Curran,W.(2014)Persistance of herbicides in soil.Weed Science.vol 10 pg 233.   
Barberis,C(2013).Roundup causes growth of deadly fungal toxins.   Lab Evidence. 
Blasioli,S.(2011)The fate of herbicides in soil.Dept.of agrienvironmental science.Jounal of agrichemical and food chemistry.vol 50 pg 157.   
Ralston,S.(2011) Nuritional requirements for horses.Merk vet manual ed. 10 pg 2049.