Can't get horses weight up

Ok I'm in Australia so the feeds available here are going to be different BUT I've brought home a 27 yr old mare in an emaciated state and got weight on her in six weeks. This was my feeding regimen with her (I'm not saying you need to do this but this will give you an idea of how easy it is to get weight on a poor horse):
Morning - one or two biscuits of hay (we call a flake a biscuit) and hay varieties I used were rye grass, oaten hay and then I introduced Lucerne hay PLUS two dippers of Maxi Soy prepared feed Maxisoy+ Australia

Mid-morning - a biscuit of hay

Lunch - a biscuit of hay + one scoop of Gumnuts prepared feed for older horses
Mitavite - Scientifically Balanced Feeds

Late Afternoon - a biscuit of hay

Night feed - 2 bisuits of hay + 2 dippers of Maxi Soy.

I gradually built up the quantities, starting off with simply rye grass hay and 1/4 of the quantities of prepared feed. But in the six weeks we had her before she crossed the bridge, she went from emaciated to nearly normal body weight. She died of old age, but had she not been starved by her previous owners, she may have lived a much longer life. We know she had been a brood mare and had foaled last season.

So my suggestions are: introduce a good quality prepared and complete feed; change hay suppliers or at least find out what composition your current hay supply has (there is so much variation in hay quality which affects its nutritional make-up); separate the horses and weight each animal's feed and ensure each animal only eats its own feed; accurately weigh each horse now to determine its actual volume requirements (weight of feed per day each horse needs to gain weight, not maintain); take photos of each animal now so you can monitor their progress and; ensure each horse has a thorough examination by a trusted vet as there are so many problems that are indicated by poorer body condition. Best of luck...your horses can't speak for themselves so it's up to you to speak up for them and maybe it would be best to re-home one so they can all be cared for to the level they each require.

Love gumnuts and maxisoy/speedi beet, we are using it regularly for our old gelding, but ended up adding a feed called 'weight lifter calm' that is brought up to us from Victoria.
Weight Lifter is an amazing food for him, as he has about 4-6 teeth left he really relies on stuff we can soak, so he doesn't have to have anything hard to chew on. On a body mass scale (visual) he went from about a 2-3 to a comfortable 5.

Good luck with your four, if your dad isn't up for spending more money on different feeds (like hard feed as well as supplemental hay), then it may be better to let one go. But then again, if you are happy with how they look in general, and they are up to date with everything, there's not really much anyone can say... good luck

We use weight lifter too from time to time - isn't it fantastic! Good to see another Aussie in the thread too...I'm sure we've all hard hard keepers or know someone who has.

First of all, weigh your flakes, that's all I can say. I've been told by every hay seller so far that bales weigh 110lbs but have yet to see a bale which actually does....maybe the ones they keep.

How do I know? I weigh every serving for my horses. And a 4-5" flake if alfalfa weighs about 7 lbs, 3-way even less.
Then it depends on the quality, especially of the 3way. Could be all straw, when baled late=very little nutrition.
Do they clean up the hay completely, also the 3way? If yes, they need more. Period. Or something extra. If you give them some sort of feed one week out of the month for the psyllium, why not the whole time? That might be just what they need extra. Could be alfalfa pellets with some oil or other fat source, and a vitamin/mineral supplement. The blocks DO NOT PROVIDE SUFFICIENT, are hard to get enough off. They're meant for cattle.

Try to get some pics up
Another way to see if they're underweight : Google the Henneke Body Condition Score, print out the instructions and score every horse. If they're below 4,5 they're too skinny. That your dad might just understand....it's being used by vets. If they all come out at around 5, yo have nothing to worry about

If they`ve always been in this condition they may be just fine, and rounding off cohld make them fat. Its harder to say without pictures. With their age I would say they are full grown (no growth spurt issues). QH horses tend be to stocky, but theres been an influx of lighter breeds making for slimmer QH, so hard to tell from that.

As a general rule, ya can't really get around adding weight without spending more money in some way or another.

P.S do you only use uvermetim
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Here one of them...like I said...he's not starving. Just want to round him off.

Arg, stupid phone.

Do you only use ivermectim gold or do you rotate wormers? Withoht rotating, there can be a build up of parasites not covered.
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Oh dear that horse is fine. I don't see a worm belly and he's shiny.
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Looks good to me, from what I see...a horse in working condition.

If you'd stop working him, he'd be chubby in no time

This is my youngest horse...will be 2 in August