During my last rotation through the vmth in livestock services I learned that one effective way to get a significant amount of salt into a goat's diet is to create a saturated solution of water and salt, and spray it on their hay.
Much like gradually increasing the amount of salt/electrolytes present in the mash, more and more salt could be sprayed on the hay, increasing the amount of elyte intake during a ride (and thus stimulating the thirst reflex).
Farley is up to one and a half doses of electrolytes per pound of dry feed (works out to one table spoon of salt per cup of dry feed)! An enormous amount that she doesn't even blink at whether at home or at a ride. I typically feed between 2 to 3 pounds per mash per "serving" in a ride setting, which means that she would be consuming up to almost 5 doses!! Not that I would necessarily put the max amount of elytes I could into the mashes, but not having to syringe the elytes and having her consume them on her own is something I really care about.
My experiment with Farley's mashes tells me that it would certaintly be possible to get a horse used to saltier hay. Now the question is....is this a good idea worth perusing.
Male goats castrated young have a smaller diameter urethra because of the absence of tester one. Yet another blow against their already too long and small urethra in the first place. Thus male goats casturated young are at increase for stones or being "blocked". It is generally recognized as a primary metabolic disorder with other components such as genetics, but the prevention is primarily nutritional, including significant salt increase, reduction of alfalfa etc. Really people, I havent found one good solid argument for young castrations and spayings for animals that are intended to live to the end of their natural life span (ie not production animals).
Remember that in giving an endurance horse electrolytes at a ride you are not trying to replace the entire amount of elytes lost. That is a ridiculous amount. Instead, you are trying to influence the thirst receptor, which in the horse is less sensitive and lags behind the hydration curve compared to humans. But making the blood saltier, the thirst response kicks in and the horse will drink more. See my notes regarding Garlinghouse's AERC convention presentation on elytes and the dehydrated horse for more information.
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