Coop size, materials, stocking density and equipment. Floor area is set by harvest weight rather than by bird count once the birds pass about 1.7 kg, which is the rule most backyard coop guides get wrong.
Four Philippine documents publish a feeder allowance: 65 mm a laying hen in PAES 403:2001 § 8.5.1.1, 100 mm on page 3 of DA Regional Field Office II's guide, 150 mm on a chain in DA AO 12 s. 2002 Appendix 1, and 75 mm for a broiler in PAES 402:2001 Table 3. The two Penn State rows the coop pillar carries overlap that span. For 20 hens: one 120 cm double-sided trough, or two pans, plus two drinkers.
PAES 403:2001 § 6.1 Table 1 gives the same laying hen three different floor areas depending on what she is standing on: 17 m² per 100 birds on a litter floor, 14 on slot-litter, 9 on slats. The litter row asks 88.9% more floor than the slotted row, and that spread is storage. A slotted floor banks its droppings in the 900 mm of air § 7.5.1.4 puts underneath, which for 20 hens is eighteen 45-day cycles before the pit is full; a litter floor banks them in 50 mm to 100 mm of rice hull behind a 600 mm wall and is carried out every cycle. Read the three rows against PNS/BAFS 312:2021 and the slot-litter row lands exactly on § 6.2's 0.14 m² cage-free minimum.
Is the pugad in your kulungan the hottest box in the building? DA Administrative Order No. 12 files nest boxes under TEMPERATURE rather than under housing, and the standard that describes the box asks for it enclosed, curtained and draught free. On the light half, three Philippine documents set an intensity three times over and an hour target never, and the bulb that would close December costs ₱12.12 a month.
Twenty tropical cyclones enter the Philippine Area of Responsibility in an average year and eight or nine of them cross the country, and the enforceable Philippine standard for broiler housing names two structural loads, neither of which is wind. The number that does exist sits in the structural code, one basic wind speed per province, and at four of the ten PAGASA stations checked here the strongest wind already on record is above the speed that province is designed against. What is left for a bakuran is not a stronger building. It is a signal, a lead time, and a decision about where the birds go.
Every predator guide a Filipino keeper finds first was written against animals that do not live here. This one works from the aperture a Philippine threat actually passes, the one peer-reviewed record of a named Philippine animal taking chicks, and the peso line in the Local Government Code that decides where a stolen manok gets reported.
Every ventilation rule on the first screen of results is an area rule written for a sealed box in a cold winter. The Philippine standards give no area at all. They give positions, and both positions depend on a wind direction that flips between amihan and habagat. Held against PAGASA wind normals at four stations, the rate a Philippine order asks for is satisfied by air crossing the mesh at 3.5 centimetres a second, while the speed a hot bird needs is above the mean wind at every station checked.
Every guide tells you to keep water available and then stops, because the honest answer to how much is a ratio rather than a figure and nobody wants to write that. Four published sources give four different water-to-feed ratios, one DA regional office quietly published a per-hen intake table in gallons, and the Philippine welfare code requires an annual water test against an appendix that is not in the document. This page holds all of it in one place, with the drinker counts and the eight-hour limit that go with it.
Eight hardware listings with a date on them, fifteen modelled estimates kept strictly apart from them, and the finding that reorders all of it: in July 2026 lumber, G.I. sheet, plywood and hardware were the four slowest subindices in the whole PSA construction wholesale index, so a coop is built almost entirely out of the part that is not moving.
Every page on the first screen of results treats heat stress as a summer emergency, which is what it is in Ohio. Measured against the Merck comfort band, all 36 station-months at three PAGASA stations are above the heat-stress threshold on the monthly mean and 24 of them are above it even at the coolest hour before dawn. So the question here is never whether the birds are heat stressed. It is which of four levers is still worth pulling, and the humid air rules out the one every foreign guide recommends first.
Every coop guide you can find was written for a cold country. The Philippine broiler standard covers free-range production only, and its indoor limit lands exactly where Aviagen puts its hottest-month cap.
PNS/BAFS 262:2018 counts broilers in kilos and native chickens in birds, and past 2.83 kg a square metre holds fewer broilers than native chickens. Read the two lines against each other and the same square metre carries 3.85 times more live weight of broiler than of native chicken, which is this page's arithmetic on the standard and on a published native mean weight rather than a figure PNS prints.
The day-old chick figure is published, wholesale, and not what a dealer will quote you for 20 sisiw. Feed, coop, vaccine and equipment have no Philippine price at all. What is computable is the shape: cost per bird falls hard from 20 to 50 and barely at all from 50 to 100.