Estimation of THI Index to Evaluate Thermal Stress of Piglets in Summer Season
학회지: 한국농공학회 60(4), 113-122쪽
저자: 하태환, 권경석, 이인복, 김락우, 여욱현, 이상연, 최희철, 김종복, 이준엽, 전중환, 우샘이, 양가영
개요
Thermal stress of pigs causes decreased feed consumption and weight gain rate, immunosuppression, reproductive disorders, and increased mortality. The concept of the temperature-humidity index (THI) has been widely used to evaluate the degree of thermal stress of pigs. However, use of this concept is strongly restricted for animals living in the enclosed facilities. In this study, Building Energy Simulation (BES) technique was used to realize the energy flow among outside weather conditions, building materials, and animals. Especially, mechanisms of sensible and latent heat generation from pigs according to surrounding air temperature and their weight were designed to accurately evaluate the THI values inside the pig house. The THI values computed by the BES model were compared to those calculated by method of the report (NIAS, 2016), the model of this study predicted the start date of heat stress about 9∼76 days earlier compared to the NIAS model. Results of the BES model also showed higher frequencies of the THI above the THI threshold for pigs, indicating that conventional model has a possibility of underestimating the degree of heat stress of pigs
Download Link : https://doi.org/10.5389/KSAE.2018.60.4.113