環(huán)境因子對動物生產(chǎn)之影響(編輯修改稿)
2025-06-18 22:39 本頁面
【文章內(nèi)容簡介】 kg cattle QL/QT = 70% 100% when Tdb 30oC Within QL, through respiration: 2025%, others through skin. Evaporative cooling method should not increase the humidity of the environment around cattle (0 to meters above ground). Index bining Temperature and Humidity THI = T (in oF) – * (100RH%)/100 * (T – 58) (English unit) THI = Tdb (in oC) + * Tdp (in oC)+ (Metric unit) Temperature Humidity Index (THI) T, Tdb RH% Twb Tdp THI oF= 26 oC 45% oC 13 oC THI= (Ingraham’s eq.) THI= (Armstrong’s eq.) 104 oF= 40 oC 100% 40 oC 40 oC THI=104 (Ingraham’s eq.) THI= (Armstrong’s eq.) THI = f(Tdb, RH) THI THI = f(Tdb, Twb) THI Impact of Humidity Tdb (℃) RH (%) Holstein Cow Jersey Cow 24 38 100% 100% 24 76 96 99 34 46 63 68 34 80 41 56 Relative MP THI THI = 70, MPD occurred， THI 80, severe MPD MPD is not linear depend with THI. THI90, no recovery Adapted from ASHRAE Fundamentals, 1999
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