A 3-year study on four Northern Italian dairy farms found that ceiling-fan ventilation raised milk yield by 2.9 kg/cow/day and improved reproductive traits, with a benefit–cost ratio of 1.34–1.51 depending on heat-stress intensity.
A 445-sow commercial study in southern Brazil comparing two farrowing-room temperature programs. Raising the cooling setpoint by 2 °C cut total electrical energy use by 20.4% (≈ US$1.00/sow), but reduced sow lactation feed intake (6.5 vs 6.3 kg/day) and litter weaning weight by 5.8 kg, translating to a US$5.28/litter/sow economic loss — substantially outweighing the energy savings.
Bitopan Das, Polash Pratim Dutta, Monoj Bardalai , Partha Pratim DuttaDepartment of Mechanical Engineering, Tezpur University, Napaam, Assam, India. Proper ventilation in dairy barns is important in the summer as high temperatures and the accompanying heat stress can affect the…
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