| 摘要: |
| 呼吸测热是研究家畜能量代谢,确定家畜的能量需要和评定饲料能量价值的重要方法。常用有呼吸室和呼吸面具法。近几十年来,大家畜的呼吸室发展较快[1]-[5]。呼吸室法准确可靠,能长时持续测定,但设备较复杂,成本很高,至今在国际上只少数研究单位有大家畜呼吸室。常用的非呼吸室法有面具和头套法[6]-[11],由于装置成本低,能携带至现场测定,在国际上仍继续使用[7]-[11],但传统面具法(开路集气袋法)目前应用的不普遍。国内现刚 |
| 关键词: 准确可靠 呼吸室 呼吸测热法 产热 能量代谢 家畜 呼吸面具 气袋 闭路循环 对比试验 |
| DOI： |
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| STUDIES ON A NEW CLOSED CIRCUIT MASK FOR ESTIMATING HEAT PRODUCTION IN ANIMALS |
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| Abstract: |
| This paper describes the development of a mask system which started as the traditionalOpen Circuittype.Because the traditional failed to give good agreement with measurements made in a respiration chamber it was modified to a newClosed Circuitsystem.Experiments were performed on young hereford cross friesian steers and heifers of appro- ximately 200kg liveweight given rations of barley and dried grass at maintenance level for at least 4 weeks prior to any measurement.Data obtained with the two types of mask... |
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