【正文】
環(huán)境因子對動物生產(chǎn)之影響 方煒 臺大生機系 Engineering Fundamentals: part II Impact of Environmental factors to the animal Impact of Temperature Impact of Humidity QT, Qs, QL THI and MPD Impact of Air Velocity Impact of Radiation BGT and WBGT Temperature LCT, Neutral zone, UCT Adapted from ASHRAE Fundamentals, 1999 Air temperature, oC Impact of Temperature Adapted from ASHRAE Fundamentals, 1999 Growth rate Energy Efficiency Adapted from ASHRAE Fundamentals, 1999 From 14 to 24 oC No impact in MP Milk Production Decline at T25 oC At 30 oC, MP reduced by 25% At 35 oC, MP reduced by 50% Known facts ? Optimum Temperature zone for mature Holstein cows: 10 – 20 oC for new born: 10 – 15 oC ? Milk Production Decline at T25 oC ? Temperature of Tainan, Taiwan (based on 19811994 hourly weather data) – Probability of T= 15 oC is % – Probability of T= 20 oC is % – Probability of T 25 oC is % – Probability of Twb =25 oC is % – Probability of Twb =26 oC is % – Probability of Twb =27 oC is % – Probability of Twb =28 oC is % Impact of Humidity Tdb (℃) RH (%) Holstein