Outdoor Farrowing, Weaning Age and Who Actually Keeps Pigs

#Twenty-six

That is how many pigs a South African commercial sow weans in a year. Not a target from a textbook — a measured figure across 38 to 45 South African farms in 2023: 26.0 to 26.1 pigs weaned per female per year (PigCHAMP South Africa 2023).

Your outdoor sow will not do that. She cannot, and the reasons are structural rather than a matter of effort. What separates a working pastured-pig enterprise from one that quietly runs out of money is whether the farmer costed the gap in advance or discovered it in year three.

South African specifics

South African commercial sow-herd benchmarks, 2023 (PigCHAMP SA, 38–45 farms):

Measure	Figure
Total born per litter	13.9 – 14.2
Born alive	12.9 – 13.1
Pre-weaning mortality	8.9 – 9.5%
Average weaning age	25.9 – 26.3 days
Farrowing rate	85.3 – 86.7%
Pigs weaned per sow per year	26.0 – 26.1
Sow death rate	~7.4%

These are the numbers your bank manager, your feed rep and your own spreadsheet will silently compare you against. Know them before you argue with them.

#Sixteen days, and what sixteen days actually cost

If you certify under A Greener World South Africa, piglets must be at least six weeks old at weaning. Set that against the South African commercial norm of about 26 days and the arithmetic is immediate: 42 minus 26 is 16 extra days in every reproductive cycle.

Work it through. Gestation in the one measured South African indigenous dataset ran 114.3 ± 2.9 days (Makhanya, ARC Irene herd). The third term — the interval from weaning to the sow being served again — is not in the South African benchmark set, so the seven days below is a planning assumption, not a measured figure. Substitute your own the moment you have it; the 16 days is the part that does not move.

Commercial cycle: 115 gestation + 26 lactation + 7 wean-to-service = 148 days → 365 ÷ 148 = 2.47 litters per sow per year Six-week weaning: 115 + 42 + 7 = 164 days → 365 ÷ 164 = 2.23 litters per sow per year

That is roughly 10% fewer litters, from the weaning rule alone. Applied to the SA commercial output: 26.0 × (148 ÷ 164) = about 23.5 pigs weaned per sow per year before anything else goes wrong.

#Then the mortality trade, named honestly

Loose or free farrowing removes the crate. It also removes what the crate was doing, which was stopping the sow lying on her litter.

What you can do is model the direction. If liveborn losses rose from roughly 9% toward 15% under loose farrowing, weaned piglets per litter would fall by about another 6%, taking the 23.5 above to somewhere near 22 pigs weaned per sow per year. That is the top of the realistic outdoor range. A more honest planning band is 2.0 to 2.2 litters per sow per year and 18 to 22 pigs weaned per sow per year, against 26 indoors — and you should require of yourself that you prove your own number from your own records rather than adopting anyone else's, including this one.

Kolbroek litters are smaller to begin with. The measured ARC herd recorded 12 ± 1.7 piglets in the first farrowing; a working South African free-range farm reports about 7 piglets for its Kolbroek sows. Those two figures are far apart, they come from a small thesis and a farm website respectively, and the South African evidence base for this breed is genuinely that thin. Quote whichever you use, and say where it came from.

#The ark is a heat problem before it is a cold problem

The mistake outdoor systems most often make in South Africa is designing housing for winter.

Pigs do not sweat. Across most of this country the binding constraint on an outdoor pig is heat and sunburn, not cold, and the design consequences are immediate. Published thermal-comfort ranges by weight class circulate widely — adults broadly comfortable between about 15 °C and 30 °C, young piglets needing far warmer — but the sources carrying those bands are commercial web pages rather than South African measurements, so treat the direction as sound and the exact numbers as indicative. What is not in doubt is that white-skinned pigs sunburn readily, that a wallow which coats the whole body gives partial protection, and that heat stroke in a pig is a veterinary emergency, not something to manage from a course note.

Do this on the farm

Design the outdoor farrowing system to these five constraints, in this order.

Shade for every pig at midday, plus a wallow or sprinklers whenever heat stress is a risk. This is a requirement of the AGW standard, not a nicety.
A farrowing hut of at least 4.0 m² per sow, and design it for the litter as well as the sow — corner door, protected creep area, room for the sow to lie down away from piglets.
Move the arks to shade in December to February on the Highveld, and plan for pigs to be handled early morning or late afternoon, never at midday.
Farrow in the shoulders, not the extremes. On the summer-rainfall interior the windows are September to November — mild nights and growing forage for lactating sows — and March to April. Do not farrow outdoors in the May to August frost window without deep bedding and windbreaks. An unheated ark on a Highveld night below zero is a piglet-mortality event, not a bad night.
Budget the ration back to essentially all concentrate from May to August. Winter standing hay on the Highveld is worth nothing to a monogastric, and a cold pig eats more just to hold condition.

#Who actually keeps pigs in South Africa

The picture most course material paints — a commercial sector with a few smallholders around the edges — is upside down on ownership.

South African specifics

The South African pig sector by the numbers (BFAP 2020, cited in Elsenburg/AgriProbe 2023):

Formal sector (more than 50 pigs): 170 producers holding 1 450 713 pigs.
Informal sector (fewer than 50 pigs): 208 312 households holding 893 262 pigs.

So roughly 38% of the national pig herd sits in the hands of more than two hundred thousand households, and the number of keepers is growing: non-commercial pig farmers almost doubled from 112 678 in 2011 to 210 504 in 2016, with over 1.6 million pigs in the informal sector at risk by 2016 (StatsSA, cited in the DALRRD ASF Strategy 2024).

A separate industry count from SAPPO in January 2026 gives 373 registered producers and 140 801 breeding sows (African Farming). It does not contradict the 170 — the two counts are counting different things, five years apart, on different definitions. Say which one you are quoting.

Why this matters to a farmer rather than a policy analyst: the pig is a savings account with legs. It converts household and garden material into a liquid, divisible, fast-breeding asset in places with no bank and no cold chain. That is precisely why the sector grows in a downturn, and why a lecture about biosecurity standards lands as a dismissal rather than as advice.

Contested — here is both sides

Should the state simply prohibit pig keeping under unsafe conditions?

For. Free-ranging, unconfined, swill-fed pigs are the transmission route that keeps African swine fever endemic and that carries Taenia solium into human communities. Every controlled disease in the previous lesson has the same vector: an animal that moves and a feed that should not have been fed.

Against — and this is the department's own position. DALRRD's strategy states in terms that "Passing laws that prohibit pig keeping under unsafe conditions would immediately declare at least 200 000 pig keepers illegal and thus worsen their economic situation", and that ASF "will cause devastation in some communities due to the large number of informal pig keepers and the threat to food security." It also names the real constraint: "Non-commercial pig owners may not have the means to protect their pigs, as they generally don't have the resources to confine pigs or to buy safe feed."

The synthesis. The biosecurity gap in this sector is a resources gap, not an attitude gap. What actually works is confinement plus sanitation plus getting carcasses through an inspected abattoir — funded, supported and made cheap enough to adopt. Regulation without that is a criminalisation programme with a public-health label on it.

#Three numbers that do not exist, and what to do about it

Elsenburg says plainly that the informal pork market "is a valuable contributor to the pork industry, but the contribution has not been quantified." That honesty is worth copying, because three of the numbers a pastured-pork business plan most wants are simply not available in South Africa:

No South African free-range or outdoor piglet mortality benchmark. Everything in circulation is international. Your own farrowing records are, for now, better evidence than anything you can cite.
No South African willingness-to-pay figure for pastured pork. No peer-reviewed premium in Rands could be located. Against that, the commodity floor is real and it moves fast: the farm price fell from about R40/kg to about R30/kg between February and July 2026 (Business Report, 23 July 2026). Assume no premium until a named customer has paid you one twice.
No verified South African average pork carcass mass from an authoritative source. The 70 kg figure in general circulation traces to an undated commercial web page. Weigh your own carcasses and use those.

#What to do on Monday

Open a farrowing book — one line per litter, with the date, total born, born alive, weaned, and what killed the ones that died. Within eighteen months that book is worth more to you than every benchmark in this lesson, because it is the only South African outdoor dataset that will ever describe your farm. Then take the 16-day weaning arithmetic and run it against your own sow numbers before, not after, you commit to a certification standard.

#Check yourself

4 questions — answers explained as you go

1Moving from 26-day weaning to the six-week (42-day) requirement changes the reproductive cycle from about 148 days to about 164 days. What is the approximate effect on annual output per sow?
Why: 365 ÷ 148 = 2.47 litters; 365 ÷ 164 = 2.23. The ratio 148/164 is about 0.90, so roughly a tenth of the sow's annual output goes to the weaning rule alone. Heavier, more robust weaners are a real benefit — but the cost is measurable in cycle days, and it should be priced rather than assumed away.
2Which comparison between commercial and outdoor piglet losses is legitimate?
Why: The two measures have different denominators and the 16–20% range is international, not South African. Using them as if they were interchangeable produces a confident number that is wrong in an unknown direction. Model the direction, plan conservatively at 18–22 pigs weaned per sow per year, and replace the estimate with your own farrowing records as soon as you have eighteen months of them.
3Roughly what share of South Africa's pig herd is held by the informal sector, and what follows from it?
Why: The informal sector holds the minority of the pigs but the overwhelming majority of the keepers, and the count of keepers nearly doubled between 2011 and 2016. That is why the department's own strategy rejects prohibition and frames the problem as a resources gap. Note also that the informal market's economic contribution has never been quantified — Elsenburg says so directly.
4A December farrowing on the Highveld goes badly and you lose piglets. Which design failure is most likely, on the evidence in this lesson?
Why: Cold is the May-to-August problem, and it is real — an unheated ark below zero is a mortality event. But the design failure most often made in South African outdoor systems is treating heat as secondary. Pigs cannot sweat; shade at midday plus a wallow or sprinklers is a standard requirement, and moving arks to shade for December to February is a scheduled task, not an emergency response.

Outdoor Farrowing, Weaning Age and Who Actually Keeps Pigs

By the end of this lesson you can

#Twenty-six

#Sixteen days, and what sixteen days actually cost

#Then the mortality trade, named honestly

#The ark is a heat problem before it is a cold problem

#Who actually keeps pigs in South Africa

#Three numbers that do not exist, and what to do about it

#What to do on Monday

#Check yourself

Sources for this lesson