Recurrent hives-all help appreciated

Hi, no I removed all chemical sprays a long time ago. As for the hay, his allergy started in the winter months where the hay came from a different province, during the hotter months the hay comes from a different province, I also tried hay from the nearby racetrack here. No difference really

Hi,

It’s not really bug season right now, so no one really uses fly spray at the moment, I stopped using all chemicals and sprays a long time ago now

Different types of sprays can be used by the farmers who MADE the hay. If you did not make the hay yourself, you do not know FOR SURE that some different treatments were not used, unless it is certified “organic”. Most commercial hay producers do use different types of treatments on their fields, for weed control, or for mold control in the bales. Many farmers will “kill” a field before ploughing it all up, and reseeding. Most horses do not have an issue with this practice, and it makes the hay look “top quality”. The hives are an allergic response to something your horse is coming into contact with. It may be difficult to figure out exactly what that substance is. The process of elimination is key to success.

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I just noticed this . . . some horses are allergic to soy . . . maybe that’s the problem??

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So it’s the pesticides that could be causing more harm rather than the actual grasses in the hay? However all of the barns buy hay from this exact supplier, all I know he has three types of hay ‘bad’ ‘average’ and ‘good’ he always eats either the ‘average’ or ‘good’ depending on what stock he has at that moment.

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Yes, could be. Process of elimination it is, i’ve done it a couple times now. Hoping this times the charm (fingers crossed)

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Usually it’s herbicides
 to get rid of weeds that start to take over a hay field. And for MOST horses, it is harmless. But
 for some, it may not be. People don’t like buying hay that has weeds in it. And some weeds are a problem for horses too. So
 either you spray and kill the field, plough it up and replant the species you want in your hay, OR, you have some weeds in your hay.
It’s just something for you to consider. Your horse sounds like it is allergic to SOMETHING. Your job is to find out what that might be.
What makes one hay the seller has “bad”, “average” or “good”? Is the “good” hay weed free? If so, there is a reason why.
Round Up kills everything in the field. Grazon kills everything that isn’t grass (the grass prospers when the broadleaf plants are gone). Grass hay with dandilions etc in it has not been sprayed
 but it may have things like thistles etc in the hay
 things other than grass.

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For all i know, the ‘bad’ hay is hay from a swamp field. it comes yellow, rough and wet. The average hay is greener, it has some spiky plants however all in all it’s not too bad. The good hay is taken from one certain field, it is thin, green and has no spikes and the grass is all the same, it is also less dusty. I have a friend who goes to the supplier every year and buys 300 bales of hay, i will have another talk with her as she knows tons more about the hay than i do.
Thanks!