Can you use this just once for a stressful event, or do you have to use it several days in advance? I'm thinking just for a horse who is hard to load

I think the product is intended for longer term use. I did not find it helped my horse who was having trouble adjusting to a new stable after a move. I finally just moved him somewhere else.

If it takes 3 days to become effective, How long do the effects last?

Maybe a day or 2 after coming off of steady state dosing, depending on the root cause of your horse's anxiety, and stimuli in the environment.

How many pouches come in this?

20 pouches - depending on your horse's weight, you need 1 to 2 pouches per day. I don't remember exact cutoff, but I think it was 1 pouch up to 1,250 lbs, 2 pouches if over that. By the way, I was extremely pleased with the results!

Can you use this at an open/4h type show or would they test + for something?

There are not usually any blood tests pulled at Open or 4H shows. Only approved higher level shows regularly test for drugs. With that being said, I do not know if the tryptophan will show up as a prohibited substance. You would do well to check with whichever governing body disapproving the show to see if there are any prohibitions.

Zylkene Equine Behavior Support Horse Supplement Powder 2000mg 20ct

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Specifications

ASIN	B01FKN87V0
Active Ingredients	Zylkene Equine contains 2000mg of bovine-sourced, lactose-free hydrolyzed milk protein called Alpha-S1 Tryptic Casein, commonly known as Alpha-Casozepine. This active ingredient has unique calming properties. It also contains two inactive ingredients: Apple Flavor and Maltodextrin. Active Ingredients Zylkene Equine contains 2000mg of bovine-sourced, lactose-free hydrolyzed milk protein called Alpha-S1 Tryptic Casein, commonly known as Alpha-Casozepine. This active ingredient has unique calming properties. It also contains two inactive ingredients: Apple Flavor and Maltodextrin. See more
Best Sellers Rank	#91,099 in Pet Supplies ( See Top 100 in Pet Supplies ) #538 in Dog Relaxants
Brand	Vetoquinol
Brand Name	Vetoquinol
Customer Reviews	4.3 out of 5 stars 153 Reviews
Item Form	Powder
Manufacturer	Vetoquinol
Manufacturer Part Number	439334
Number of Items	3
Specific Uses For Product	Active
Target Species	Horse
UPC	651307881757
Unit Count	20.00 Count

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Zylkene Equine Behavior Support Horse Supplement Powder 2000mg, 20ct

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