Hygienic evaluation of buildings for breeding of growing mulards
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Author: Hristo Hristev, Matina Nikolova, Angel Angelov, Ivan Paytakov
A hygienic evaluation of a building for raising 5,000 adolescent Mulards (1st–28th day) was carried out. The heat transfer characteristics of the building - heat balance, thermostability and accumulation capability were developed based on its construction and technological characteristics. It was found that the room temperature was maintained within an acceptable optimum for Mulards (± 10C), while the relative humidity varied widely (± 10–25%). The ventilation rate in winter was about 3 times lower than the recommended technology (instead of 0.7 – 2–2.5 m3/h). The natural and artificial lighting was insufficient (LR and CLP = 1:30 = 0.7) for the proper growth and development of the ducklings. The thermostability factor (D = 4.1 kJ/m2.h.0C) defined the building as medium isolated and heat-conducting. Its accumulation capability (S) varied from 18.4 to 250C, the shortage of heat in winter being around 100,454 kJ. The technogenic factor (Kt) for NH3 was higher (3.5 to 6) and testified the significant influence of that factor on the ambient air quality.

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