Need Jersey feeding advice

I am in central Texas and obtain a bred Jersey heifer this week.  I’ve been told she will need a pre fresh (or close up period) grain feed for 3 weeks prior to calving as she has been on grass only to date.
I am pulling out my hair on how to accomplish this.  No feed stores anywhere around me carry any dairy cow feeds.  I can order a grain ration from out of state with a minimum of 250#...  could she possibly eat that much before it went bad?
I found an article on making one that I will have to digest as it appears complicated.
I plan to put out free Redmons salt, baking soda, kelp and unlimited access to hay.
Any suggestions or advice is greatly appreciated.  

We have jersey cows in Texas so these breeders must be getting their feed from somewhere.

Where was your breeder getting their feed?

Maybe a feed store near you would be able to order the feed if they are a Purina dealer, I suggest this as I know Purina makes a jersey feed.

Tractor Supply says they have dairy cow feed so maybe you can order from them and have it delivered to your local store?

You probably know this, I’ll put it here just in case. When starting them on grain, of any type, or changing feed, it needs to happen gradually. Start with a small quantity and increase slowly every day till you get to the desired amount.

This give time to the rumen bacteria to get used to the new feed.

Some people feed chaffhaye - made in Texas☺️, and add individual grains and other supplements, along with the best grass hay and alfalfa they can make or buy.

If going the route of grains, is best to have them rolled, cracked, or soaked. Whole, unprocessed grains are poorly digested by the rumen.

Having a good salt and minerals protocol goes a long way in avoiding deficiencies, in my opinion.

Thank you all.  I do have an organic feed mill nearby that may make custom mixes.
Also there is a dairy in another town that has jerseys - so I’ll reach out to them.
My Dexters seemed soo much easier!  Lol