On feed, your herbivores shouldn't need more than grass for 7 or 8 months of the year, possibly 9 months in Shropshire. Hay only for the rest, unless you are really pushing them. 2 Dexters plus this year's calves plus last year's calves (Dexter calves need two summers to be worth the butchering costs) will need around 1.5 bales hay a day in winter between them on average. 2 ewes will eat approx a bale of hay every week in winter, assuming your chosen breed will fatten in one year so the lambs are away before winter. So budget for around 200 small bales of hay. Buying in approx £5/bale (worst case), or £2/bale to make your own if you have the ground (3-4 acres hay meadow you can shut up April-July is plenty for 200 bales.) Some years you won't get hay and will have to wrap it, add £2.50 per bale to wrap plus £25 to dispose of the plastic after winter.
Pigs will eat 4lb/head/day from 4 months, ave 3lb/head/day to get from 2 to 4 months. Should be away at 6-7 months. Don't breed your own if you only want to eat 2-4 per annum, so add buying weaners at £40/head.
Meds are expensive per animal when your numbers are small. Wormers, flukicide, vaccinations, lambing supplies, calving supplies.
Vet will need to visit every year so they can prescribe antibiotics.
Slaughter and butchery costs.
Hire cattle crush once a year for TB testing. Hire bull each year plus transport. Hire ram plus transport (or buy tup lamb, use and eat
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As a guide, we calculate that our total cost of production (excluding things like fencing and major equipment, and excluding land cost, and no labour charges except for contractors for haymaking etc) results in our meat costing £4-£5/kilo to produce. Four lambs from 2 ewes should give you around 80kgs meat; 4 weaners around 250kgs pork/ham; 2 Dexter stirks around 220kgs meat. So 550kgs meat shouldn't cost you more than £3,000 to produce once you are at steady state.
We calc production costs 20p per egg, but with 40 hens I assume you will be selling eggs? So you need to sell at more than £2.40 per dozen.
10 acres isn't generous for that many cattle (because Dexters need two summers to reach any size) and all the other things you want to do, unless its fab ground - so Shropshire maybe, Wales I think you may need more than 10 acres.
As a comparison, we have approx 18 acres available for livestock here, and it is just about adequate for 2 cattle, 2 ponies, 7-10 ewes, 5 weaners (spring-autumn only) each year. Our calves go off at 12 months old (which Dexters wouldn't), the cows being housed over winter (which you may not wish to do with Dexters - but outwintering costs a lot of grass as the ground recovers in spring.) North Cornwall is wet but mild - very like a lot of Wales, and warmer than some of Wales. Shropshire ground will be significantly better.