Abstract
Heat stress for cows already starts at 21° C temperature in the stable and affects milk yield negatively above 25° C. An improvement in house climate can be attained through various measures: reducing the radiation energy from surrounding constructional parts, improved heat dissipation through higher wind speeds or by latent heat with air humidifiers. To test radiation energy reduction, a green roof with marsh plants was put on a steep sloped roof on a dairy cow house. The inside temperature could be lowered 5° C through this, compared to fibre cement roofing.
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