Bacteriological evaluation of composted manure solids prepared from anaerobic digested slurry for hygienic recycled bedding materials for dairy cows. (27th December 2017)

• Record Type: Journal Article
• Authors: Okamoto, Eiryu; Miyanishi, Hiroki; Nakamura, Akinobu; Kobayashi, Tomoyuki; Kobayashi, Norihiko; Terawaki, Yoshinori; Nagahata, Hajime
• Is Part Of: Animal science journal. Volume 89:Number 4(2018)
• Page Start: 727
• Page End: 732
• Publication Date: 2017-12-27
• Subjects: composted manure solid -- digested slurry -- mastitis‐causing pathogen -- recycled bedding material -- udder health; Animal culture -- Periodicals; Livestock -- Periodicals; 636
• DOI: 10.1111/asj.12962
• Languages: English
• ISSNs: 1344-3941

Abstract

Abstract: Changes in mastitis‐causing pathogens, pH and water content in composted manure solids (CMS) prepared from digested slurry were evaluated during turning at 2‐day intervals for 8 days (C1–C4). The numbers of streptococci, coagulase‐negative staphylococci and coliforms were 2.6 × 10 1, 1.7 × 10 2 and 1.0 × 10 1 colony‐forming units (cfu)/g in CMS (C4) (summer), and these counts were markedly lower ( P < 0.05) than those in CMS (C0 and C1). The bacterial counts ranged from 10 1 to 1.7 × 10 2 cfu/g in CMS (C4) (summer) and were within approved levels, <1 × 10 6 cfu/g, indicating a minimal mastitis risk. The temperatures in CMS (C1–C4) increased to 63°C–74°C in summer and 67°C–70°C in winter. The mean pH values in CMS (C0–C4) were 9.2 in summer and 8.7 in winter, and water contents ranged from 61.7% to 69.6% in summer and 73.2% to 66.2% in winter. The significant decrease of pathogenic bacteria in CMS appears to be closely related to temperature >63°C for 8 days, pH 8.7–9.2, and water content 62% to 73%. This study demonstrates that prepared CMS has value as a recycled material with the potential to alleviate udder health issues in dairy cows.