Resumo

TOLON, Yamilia B.  e  NAAS, Irenilza de A.. Evaluation of types of ventilation in swine maternity. Eng. Agríc. [online]. 2005, vol.25, n.3, pp. 565-574. ISSN 0100-6916.  http://dx.doi.org/10.1590/S0100-69162005000300001.

Livestock facilities, where animals carry their productive cycle, must have as main characteristic, the control of influence over climatic factors on animals. The environment variations can be controlled through the use of different ventilation systems. The objective of this research was to evaluate the influence of different environment conditioning systems on swine nursery. Three treatments have been tested: natural ventilation, cooled ventilation and forced ventilation. The climatic parameters evaluated were: air temperature, relative humidity and black globe temperature. The physiological parameters analyzed were: respiratory frequency and back fat thickness. Number of born alive piglets, average weight at weaning and number of weaned piglets were also evaluated parameters. The use of cooled ventilation systems were able to decreased animal's air temperature and respiratory frequency, and the black globe temperature and humidity index (WBGT) and the radiating thermal load (RTL).

Palavras-chave : swine; cooling; thermal comfort index.