Feeding a Sow: Gestation and Lactation Costs, PH

A Philippine backyard sow eats close to 1,000 kg of feed a year, about 20 sacks, and that number barely moves whether she gives you 1.8 litters or 2.4. What moves is what comes out. Weaning 13 piglets instead of 19 turns ₱36,600 of feed into ₱2,690 per weaner instead of ₱1,956.

Nobody publishes that figure for the Philippines. The feeding guides tell you kilos per day and stop. The economics articles cost the fattener, from weaner to market, and never cost the animal that made the weaner. So a raiser with four sows can tell you to the peso what a 95 kg pig costs to raise and has no idea what her breeding herd eats. This is that number, plus the programme that produces it.

The one-bag problem, and why this article exists

pig333's own country profile of Philippine swine production, written by Z. M. Lapus in 2009 and still the plainest description of how the backyard sector actually feeds, says backyard operations "provide the cheaper brood sow ration, a diet given to all breeders whether dry, pregnant, nursing or boars."

One bag. For everybody. Same scoop for the sow at day 30 of gestation, the sow nursing ten piglets, and the boar. Usa ra ka klase sa bahog para sa tanan is how it gets described in the Visayas, usually with a shrug.

Seventeen years on, walk into most three-to-ten-sow yards in the Visayas and that is still what you find, and honestly it is not stupid. Buying one SKU means one trip, one price, no bins, no mix-ups when the neighbour's kid does the morning feed. The problem is that the two ends of a sow's cycle need almost opposite things. In gestation you are trying to stop her getting fat on the cheapest adequate ration. In lactation you are trying to force 5 kg a day of a dense, high-lysine feed into an animal whose appetite has been flattened by 30 °C heat. One bag cannot do both, and the way it fails is asymmetric: the gestating sow gets slightly overfed, which costs money, and the nursing sow gets badly underfed, which costs piglets.

If you change one thing after reading this, change that. Two rations, not one.

The gestation curve

Three published Philippine and international programmes, side by side, plus what I would actually run in an open backyard pen.

The UNAHCO column is a Philippine feed miller's own published curve, which makes it the most locally relevant number on the page, and it lines up closely with AHDB's. Where they differ is late gestation: UNAHCO holds 3.0 kg from day 91 to day 110, AHDB says add roughly a kilo to whatever mid-gestation was running. Same answer by different arithmetic.

Two things about the shape of that curve are worth arguing about.

The day 1–7 restriction is real and most backyard raisers skip it. She has just been served, you are pleased with yourself, and the instinct is to feed her up. Do not. High feed intake in the first week after service is associated with increased embryo mortality, which is why every published programme drops her to about 2 kg immediately. You spend the extra feed and get fewer piglets for it. If you have just bred a young gilt, the pre-breeding conditioning section of my gilt readiness guide covers the flushing side that comes before this.

Day 85 is the real switch, not day 90. The last month of gestation is where roughly two thirds of the foetal weight goes on. UNAHCO puts the biggest jump in nutrient demand at day 75. I would start lifting at 85 because in a backyard pen you cannot be certain of the service date to the day, and being a week early costs you about 7 kg of feed while being a week late costs you birth weight. Birth weight is the single best predictor of whether a piglet survives its first week, and what actually kills piglets in week one is mostly a downstream consequence of how the sow was fed in her last month.

Fibre and green feed in the last three weeks

Constipation in late gestation is more common in Philippine backyard herds than in the literature, for a boring reason: concrete floors, restricted feed, and water that runs out at 2 p.m. because the drum was not refilled.

The Philippine answer that costs nothing is green feed. Camote vines, kangkong, madre de agua, water lily. Chop it, offer it in the afternoon on top of the ration, and treat it as bulk and moisture rather than as nutrition, because that is what it is. Do not count it against her concentrate allowance in the last three weeks. Do count it in mid-gestation, when she is on maintenance and a full-feeling gut keeps her quiet in the pen.

Water is not optional here. A gestating sow drinks 12 to 20 litres a day and a lactating one wants 25 to 35 litres in a temperate climate, more in the Philippines. If your drinker delivers less than about 2 litres a minute she will simply stop drinking before she is full, and the water requirement numbers are worth checking against what your own nipple actually flows into a bucket in 60 seconds. That test takes a minute and most people have never done it.

Body condition scoring with your hands

Almost nobody reading this owns a scale, and nobody at all owns a backfat caliper. Fine. The scoring system was built for hands before it was built for instruments, and hands are accurate enough to run a 3-to-10-sow herd.

Use the flat of your palm, not your fingertips. Fingertips will find bone on any sow and will tell you every animal is a 2. Press with the heel of your hand, moderately, at four places: the last two or three ribs, the backbone behind the shoulder, the hip bones, and the pin bones either side of the tail head.

The descriptions are AHDB's; the feed adjustments follow the Pennsylvania State Extension convention of roughly a pound a day per score of correction. Score her at four points in the cycle and write it on the pen wall in chalk: at service, at day 35, at day 85, and on weaning day.

Targets that matter. BCS 3 to 3.5 at farrowing. Not more. A sow that farrows at 4 has a harder, longer labour and eats worse in lactation, both of which cost you piglets. And no lower than 2.5 at weaning, because a sow who has been stripped to a 2 in lactation will either not cycle or will cycle and not settle.

Most guides stop at "aim for a 3." The number that actually runs a herd is the second one: if more than one sow in five is coming out of lactation below a 2.5, your lactation feeding is broken, not your genetics. That is a herd-level diagnostic you can do with your hands on a Sunday morning.

Lactation, and the Philippine intake problem

Here is where the published numbers stop describing your pen.

The Kansas State swine nutrition guide builds its lactation recommendations assuming a feeding level of 14 lb/day, about 6.35 kg, of a lactation diet, and puts the standardised ileal digestible lysine requirement at roughly 60 g/day. AHDB specifies 16.0–17.5% crude protein and 0.80–0.85% lysine for a parity-2-and-up sow, and 18.0–19.0% CP with 0.95–1.0% lysine for a first-litter gilt, who needs a denser diet precisely because she will eat about 15% less than an older sow.

Those are all temperate, climate-controlled numbers. Your sow is in an open pen in Bohol in April.

Silva and co-workers, working in the tropics at 85–98% relative humidity, measured lactating sow feed intake falling by 462 g/day for every 1 °C rise. Quiniou and Noblet, at a civilised 50–60% humidity, measured 254 g/day per degree. The difference between those two figures is the humidity, and the Philippine one is the wet one. pig333 summarises the practical effect as a 10 to 25% loss of lactation intake under heat stress, with knock-on damage to milk yield, sow condition and the next farrowing.

So the honest target table looks like this.

That is a 20 to 25 kg shortfall over one lactation, and she pays for it out of her own back. Which is exactly why she comes out at a BCS 2 and does not settle.

Four things that actually recover some of it

Feed at 5 a.m. and 6 p.m., and add a third meal at 9 p.m. Silva's tropical work found sows taking 44 to 47% of their daily intake at night during the hot season; Gourdine's group put it as high as 64%. She is telling you when she wants to eat. AHDB reports that moving from two meals to three or more lifts lactation intake by as much as 15%. Never put fresh feed down between 11 a.m. and 3 p.m. in the dry months, it sours in the trough and she walks away from it. My note on feeding frequency and timing in Philippine heat has the same argument for fatteners.

Wet the feed. A 1:1 slurry of ration and clean water goes down faster and further than dry pellets in a hot pen. Mix it at the trough, not in the bucket an hour early.

Cool the sow, not the piglets. Drip cooling on the neck and shoulders, a wet sack over the shoulder, shade cloth over the sow's half of the pen. The piglets want 30 °C and she wants 20 °C, and the pen has to give both. Get this wrong in the direction of the piglets and she stops eating.

Feed her a denser ration, not more of a thin one. If she can only physically consume 4.3 kg, the answer is more lysine and more energy per kilo, not a bigger scoop. This is the one place where paying for the proper lactation SKU rather than the brood sow bag pays for itself.

What she costs to feed for a year

Now the money. This is the section that does not exist anywhere else in Philippine pig content, so let me show the working rather than just the answer.

Feed prices. The canonical July 2026 bands are ₱1,747–1,910 per 50 kg for premium grower and finisher, or ₱34.90–38.20/kg with a mean of ₱36.69/kg; ₱28–34/kg for budget and value lines; about ₱24/kg for a corn-soya-rice bran self-mix. Sow-specific rations are a separate SKU. B-MEG sells Premium Super Inahin 1 for gestating sows and Super Inahin 2 for lactating; UNAHCO sells Pigrolac Mama Pro; Sunjin sells SM880 Brood Sow and Mamma Meal. Historically those breeder bags have listed a few hundred pesos under premium grower, and older price lists put them around ₱1,405 to ₱1,640 per bag, but every list I could find dated from 2020 or 2024 and I am not going to present a two-year-old sack price as this month's. The online marketplace listings that do carry a 2026 date, around ₱2,420 for Super Inahin 1, include shipping and are not a farm-gate feed-store price either. So I am costing the year against the three tiers I can date, and you should walk into your own dealer and ask.

The consumption. Using the gestation curve above, the realistic Philippine lactation column, and a 7-day flush at 3.5 kg:

At 149 days a cycle the theoretical maximum is 2.45 litters a year. Nobody gets that. The gap is non-productive days, and she eats her 2.2 kg through every one of them.

Look at that spread. It is 53 kg, about 5%, across the entire realistic range of Philippine sow productivity. Her feed bill is essentially fixed at 20 sacks. Everything you do to improve her, every heat you catch, every day you shave off weaning-to-service, changes what comes out and not what goes in.

That is the whole economic argument for managing a sow herd properly, and it fits in one table.

Call it ₱24,000 to ₱36,600 a year, or ₱2,000 to ₱3,050 a month, per sow. For a four-sow yard that is ₱96,000 to ₱146,000 a year in breeding-herd feed before a single piglet has eaten anything.

Against what her litters are worth

The output side needs Philippine numbers, and there are only two honest sources.

The peer-reviewed one is Lañada and colleagues, published in Preventive Veterinary Medicine in 1999, working with 123 smallholder herds in western Leyte. They recorded a mean interfarrowing interval of 6.6 months (1.82 litters a year), 8.4 liveborn per litter, 12.8% pre-weaning mortality, and a median weaning age of 45 days, ranging from 30 to 90. That arithmetic gives roughly 13 weaned a year. It is a twenty-five-year-old study and it is still the best smallholder sow dataset this country has, which tells you something about how little anyone measures this.

The commercial one is the Lapus performance table on pig333, which puts Philippine pigs weaned per sow per year between 15.22 and 22.95, averaging 19.78, farrowing rate 67.84% to 83.55%, pre-weaning mortality 2.34% to 22.29%, and farrowing interval 150 to 171 days.

Note what that pair of sources says. The commercial low end, 15.22, is barely above the smallholder average. The commercial high end is 22.95. The spread inside the Philippines is bigger than the spread between the Philippines and anywhere else. It is not the climate and it is not the genetics. It is whether anyone is watching.

Then there is the DA Caraga Cebuano swine guide, Giya sa Pagpamuhi ug Baboy, which tells its readers that with weaning at 4 to 6 weeks a sow will farrow four to five times in two years, meaning 2.0 to 2.5 litters a year. That is a fine target and it is roughly 30% above what the Leyte field data actually measured. I would rather you planned on 2.0 and were pleased.

Here is the whole thing as one number: what the sow's own feed costs, per weaner she actually sells.

A crossbred weaner sells for ₱3,000 to ₱4,500 in 2026, around ₱3,500 typical for a Landrace × Large White. So:

Worst case on that table, the sow's feed alone eats ₱2,686 of a ₱3,000 weaner. You have ₱314 left to pay for creep feed, iron, vaccination, the boar fee or AI dose, her own eventual replacement, and your time. That sow is losing money and her owner almost certainly does not know it, because nobody costs the sow.

Best case, ₱1,280 against ₱3,500, and she clears ₱2,220 a head. Same animal, same country. The difference is a feeding programme, a heat record and a chalk mark on the pen wall.

The empty day

One derived number worth memorising.

A sow that is neither pregnant nor nursing still eats her 2.2 kg of gestation ration. At ₱24/kg that is ₱52.80 a day; at ₱36.69 it is ₱80.72.

₱53 to ₱81. Every day. For nothing. Sus, that adds up fast.

A missed heat is 21 days: ₱1,110 to ₱1,700. A sow that takes three services to settle burns 60 to 75 days. A weaning-to-service interval that runs 12 days instead of 5 costs ₱371 to ₱565 every single cycle, twice a year, forever.

That is why heat detection is a feed-cost problem and not just a breeding problem, and why the back-pressure test is the highest-return five minutes in the whole operation. It is also why the decision in my cull-sow article usually comes down to non-productive days rather than litter size.

Where to cut when money is tight

It is October, feed has risen ₱1–2/kg through 2026 with no rollback announced, PSA's official farmgate for Q2 2026 was ₱172.44/kg against a cost of production around ₱180/kg, and something has to give. Cut in this order.

1. Cut gestation, never lactation. Gestation is 271 kg of the 416 kg cycle and it is the part where a small deficit costs you almost nothing measurable. Drop mid-gestation from 2.3 to 2.1 kg on any sow scoring 3 or better and you save 10 kg a cycle. Cut lactation and you lose piglet weaning weight, sow condition, and the next litter. Three losses for one saving.

2. Move mid-gestation to a cheaper tier, keep lactation premium. This is the two-ration argument again, and it is the single highest-value change on the list. Days 8–84 on a budget line at ₱28 and the last month plus all of lactation on a proper lactation ration. On a 997 kg year that split runs about ₱31,000 instead of ₱36,600, and the sow that matters is fed properly.

3. Green feed in mid-gestation only. Camote vines and madre de agua displace maybe 0.3 kg of concentrate a day between days 36 and 84, which is 15 kg a cycle. Do not try this in lactation. She needs density, not volume. Cheaper ways to feed covers what actually substitutes and what only looks like it does.

4. Self-mix, if and only if you already have a working formula. ₱24/kg against ₱36.69 is ₱12,700 a year per sow, which is enormous. It is also the change most likely to go wrong, because a lactation ration needs 16–17.5% CP and 0.80–0.85% lysine and there is no forgiveness in it. My feed economics article has the ingredient prices; do the gestation ration first and leave lactation on a bag until the gestation mix has run clean for two cycles.

What not to cut: the day 85 to 110 lift, the lactation ramp, water, and the flush week. Every one of those has a direct, measured line to piglets, and piglets are the only thing this animal produces.

The record that makes all of this work

Everything above is arithmetic on four inputs: service date, farrowing date, weaning date, and number weaned. Not litter weights, not backfat, not feed conversion. Four dates and a count, per sow, per cycle.

Write them on the pen. A nail, a piece of plywood, a marker. Service date on the left, add 114 days for the due date, weaning day 28 after that. The farrowing date calculator will do the counting if you would rather not, and it also gives you the date to move her to the farrowing pen and the earliest sensible re-service.

Once you have four cycles of that for each sow, you can do the only calculation that matters at herd level: divide each sow's annual feed bill by the piglets she actually weaned. One of your sows will be at ₱1,300 a weaner and one will be at ₱2,700, and until you have written the dates down you will not know which is which. Most raisers cull the sow with the small litter. The sow you should be culling is usually the one with the empty days, and she looks completely fine standing in the pen.