Compost Dairy Barn Layout and Management Recommendations in Kentucky: A Descriptive Study

Area of Science:

• Agricultural Engineering
• Animal Science
• Environmental Science

Background:

• Compost-bedded pack (CBP) barns are increasingly used for dairy cattle housing.
• Understanding management practices and their impact on barn environment is crucial for animal welfare and productivity.

Purpose of the Study:

• To describe the physical characteristics of CBP barns.
• To analyze bedding materials and management strategies.
• To investigate the relationship between barn conditions and microbial populations.

Main Methods:

• Surveyed 42 CBP barns in Kentucky, USA.
• Recorded barn dimensions, herd size, and breeds.
• Characterized bedding materials (sawdust types) and moisture content.
• Observed bed-turning frequency and fresh material addition.

Main Results:

• Average barn dimensions: 49.1m x 21.9m; average herd size: 90 cows.
• Common bedding: green/kiln-dried sawdust; mechanical turning <0.25m depth.
• Average moisture content: 59.0%; range 36.2-71.8%.
• Higher compost temperatures correlated with absence of coliforms.
• Lower moisture content linked to higher E. coli, Bacillus, and Streptococcus counts.

Conclusions:

• Significant heterogeneity in management practices observed across CBP barns.
• Producers expressed general satisfaction with the compost barn system.
• Environmental parameters like temperature and moisture influence microbial presence.