I beg to differ. My mare suffered from hindgut acidosis, was lathargic and would only eat dried twigs or dead grass for a week. After one day of using EquiShure she started to bounce back and was her old self in a couple of days. Thank goodness my nutritionist knew what was going on because my (now former) vet just thought she had a mild virus.
In my personal case, we tried everything to try and sort her tummy - probiotics, prebiotics, omeprazole, tums, everything. Saw pretty much no difference at all. Decided I might as well try the bicarbonate after reading some stuff, and in a couple of days her poos went from stinky cow like to almost normal. She has always been a very hard keeper and the diarrhea surely wasn't helping, so once it stopped she just bloomed and gained about 50kg in two weeks.
I am feeding a table spoon in every meal; she has 6 meals so 6 table spoons.
I buy it at a regular supermarket and its pretty cheap.
Last month I ran out and she didn't have it for 6 days. On the last day, she had cow poo again, so I'm convinced the bicarb is whats keeping her healthy.
My sheep guru advocates free choice baking soda for the sheep - along with their free choice minerals and salt block. It wasn't clear to me what it's supposed to do, but I keep it out in the barn and they consume small amounts of it periodically. The horses also have access to it, but I can't recall seeing them consume it.
It will be interesting to hear how it works out for you.
FeedXL Newsletter #48 Feeding the off-the-track thoroughbred had what I thought was a good explanation regarding how long it takes for the digestive flora to adjust from a high grain (bad) to a forage based (good) diet. But, I think you may have to have a subscription - well worth it - to see it.