Biga (60–65% Hydration Preferment)

100%

Strong bread flour (or Italian type 0) — High protein (12–13%) essential; gluten must withstand tight hydration and extended ferment

60–65%

Water (cool, 15–18°C) — Lower hydration than poolish; mixture will be shaggy, not smooth — that is correct

0.5–1% of flour weight

Instant yeast — Higher than poolish because the stiff environment slows yeast activity; reduce to 0.3% for 18-hour cold biga

Combine flour and cool water, mixing roughly until no dry flour remains — do not over-work. The dough will look ragged and lumpy. Mix in yeast. Transfer to a lightly oiled container, cover, and ferment at 16–18°C for 14–18 hours (or 4 hours at room temperature then refrigerate). The biga is ready when it has roughly doubled, smells nutty and faintly sour, and the interior shows visible fermentation bubbles. Tear into chunks and add to the final dough, allowing it to hydrate before adding remaining water.

• A biga is ready to use when it tears stringily and shows internal web-like gluten development — not when it merely doubles in volume.
• Adding biga to the final dough in torn pieces (not as one block) speeds hydration and reduces mixing time.
• Because biga strengthens gluten, final doughs made with high-biga percentages (40–50%) often need less mixing than straight doughs.
• Biga's acetic-acid bias produces a more pronounced tang than poolish; use it when a mild sour note is part of the target flavor profile.
• The cool fermentation temperature is not optional — warmer fermentation shifts the acid balance toward lactic, losing the characteristic biga character.

• Biga at 80% hydration

  Sometimes called a 'wet biga'; approaches poolish territory in texture and lactic-acid expression; used when a milder tang is desired

• Cold biga (4°C)

  Retard in refrigerator after a 2-hour room-temperature start; can extend to 72 hours for intensified flavor without over-fermentation

• Whole-wheat biga

  Replace 20% flour with whole wheat; fermentation speeds noticeably — reduce time by 15–20% or yeast by half

• Semolina biga

  Used in Pugliese and Altamura breads; imparts golden color and sweet, wheaty flavor distinct from standard bread-flour biga

• Poolish (1:1 Flour to Water, 100% Hydration Preferment)

  The wet French counterpart; higher hydration shifts organic acids toward milder lactic character

• Preferment to Final Flour Ratio

  Governs how much of the total flour is committed to the biga; 30–40% is the Italian commercial standard

• Desired Dough Temperature Formula (DDT)

  Biga water temperature must be calculated to achieve a target preferment temperature of 16–18°C

1. 1.The Italian Baker — Carol Field (Ten Speed Press, 1985)
2. 2.Advanced Bread and Pastry — Michel Suas (Cengage, 2009)
3. 3.Modernist Bread — Myhrvold & Migoya (The Cooking Lab, 2017)
4. 4.Bread Science — Emily Buehler (Two Blue Books, 2006)

Confidence: high