Interesting! Although presumably climate also plays a big role in what makes a good bedding. I basically live in a kiln so I have never had issues with moisture or mold even when using an absorbent bedding typehttps://www.forloveoflivestock.com/blog/chicken-coop-bedding-comparison
A Comparison of Commonly Used Chicken Coop Bedding Materials
Below is a chart summarizing the pros and cons of the most commonly used chicken coop bedding materials. These are numbered in no particular order (except that they are discussed in the same order below).
# Bedding Overall Rating Pros Cons Sources
(see text for more)1 Medium sand Excellent Dry, low pathogen levels, low insect levels Heavy, not good for composting, may be dusty
Garcês et al., 2013; Bilgili et al., 2009; Hafeez et al., 20092 Chopped straw Mediocre-good High absorption, some has low dust Poor water release, harbors pathogens Ward et al., 2000; Yarnell et al., 2016; Shepherd et al., 2017 3 Hemp Uncertain, preliminary studies are mixed Low mold levels, absorbent May harbor bacteria Fleming et al., 2008; Garlipp et al., 2010; Yarnell et al., 2016 4 Play sand Poor Low pathogen levels, low insect levels May cause silicate pneumoconiosis, cancer Brambilla et al., 1979; Evans et al., 1988; Roperto et al., 2000 5 Hay Poor High absorption Poor water release; harbors pathogens Olenchock et al., 1990; Wolf et al., 2005; Wichert et al., 2008 6 Pine shavings Poor Absorbent, compost well, insulate well, lightweight Pine extractives are highly toxic Vesell, 1967; Ayars et al., 1989; Törrönen et al., 1989 7 Cedar shavings Poor Absorbent, compost well, insulate well, lightweight Cedar extractives are highly toxic Sabine et al., 1973; Burkhart and Robinson, 1978; Ayars et al., 1989 8 Aspen shavings Poor-mediocre Absorbent, compost well, insulate well, lightweight Aspen extractives are mildly-moderately toxic Törrönen et al., 1989; Pelkonen and Hänninen, 1997, Burn et al., 2006 9 Hardwood shavings Poor-mediocre Absorbent, compost well, insulate well, lightweight Hardwood extractives are mildly-moderately toxic, high in molds and endotoxins Törrönen et al., 1989; Pelkonen and Hänninen, 1997; Whiteside et al., 2010 10 Sawdust Poor Absorbent, compost well, insulate well, lightweight Incredibly dusty, which exposes chickens to more toxins than shavings Vesell, 1967; Ayars et al., 1989; Törrönen et al., 1989 11 Wood chips (mulch) Poor-mediocre Absorbent, low dust High moisture, high mold levels Brake et al., 1992; Grimes et al., 2002; Ritz et al., 2005 12 Tree bark (mulch) Poor-mediocre Absorbent, low dust Caking, splinters, high mold levels Thornberry et al., 1970; Labosky et al., 1977; Grimes et al., 2002 13 Peat moss poor Absorbent, low pH may initially inhibit ammonia-producing bacteria High amount of dust causes respiratory illnesses, high levels of bacteria and mold Airaksinen et al., 2005; Kaukonen et al., 2017; Shepherd et al., 2017 14 Rice hulls Poor Good moisture release Poor absorbency, high mold levels, chickens don’t like it Grimes et al., 2002; Carbone et al., 2016; Shepherd et al., 2017 15 Peanut hulls Poor Good moisture release Poor absorbency, high mold levels, high ammonia Grimes et al., 2002; Ritz et al., 2005; Shepherd et al., 2017 16 Corncobs Poor Absorbent High mold levels, high bacteria levels, high endotoxin levels Snyder et al., 1958; Grimes et al., 2002; Whiteside et al., 2010 17 Grass clippings Poor Initially pleasant for chickens Poor absorbency, high mold levels, high bacteria levels No studies done 18 Leaves Poor-mediocre Lightweight Possibly high mold and bacteria levels Willis et al., 1997 19 Pine needles Poor Lightweight Cakes over very badly Grimes et al., 2002; Sharma et al., 2015 20 Paper products Poor-mediocre Lightweight, fewer endotoxins and bacteria than wood shavings High moisture retention, high levels of mold, high ammonia release, flammable Malone et al., 1982; Tanner et al., 1998; Grimes et al., 2002 21 Gravel or rocks Poor-mediocre Low pathogen levels, low insect activity Nearly impossible to clean, may have sharp edges that injure chicken feet Schmidtmann, 1991
