環(huán)境因子對(duì)動(dòng)物生產(chǎn)之影響(完整版)
【正文】 MPD = NL + (NL) (THI) THI increased, MPD increased. Especially severe for high NL cattle. Adapted from ASHRAE Fundamentals, 1999 Milk Production=f(HD74, HA80S) MP = – * HD74 – * HA80S where， MP: Milk production (in kg/day/cow) : daily production (in kg) per cow in normal weather condition HD74: total hrs of THI 74 for previous 4 days HA80S: square of total hrs of THI 80 for previous day Linvill and Pardue (1992) Impact of Wind Velocity Wind Velocity 10 oC oC 35 oC m/s rMP =100% (Teq,wc=10) rMP =85% (Teq,wc=) rMP =63% (Teq,wc=35) m/s 100% () 95% () 79% m/s 100% () 95% () 79% Wind Chill Index = (+10* – V) * (33 – Ta) Teq,wc= *WCI+ 33 for m/s V m/s Teq,wc = Ta for V = m/s Equilibrium Wind Chilled Temperature Warm water inside The Equilibrium Wind Chilled Temperature equation does not imply cooling to below ambient temperature, but recognizes that, because of wind, the cooling rate is increased as though it were occurring at the lower equilibrium wind chilled temperature u
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