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首页> 外文期刊>The Wilson Bulletin >SOME FACTORS AFFECTING PRECISION OF THE TOTAL BODY ELECTRICAL CONDUCTIVITY TECHNIQUE FOR MEASURING BODY COMPOSITION IN LIVE BIRDS
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SOME FACTORS AFFECTING PRECISION OF THE TOTAL BODY ELECTRICAL CONDUCTIVITY TECHNIQUE FOR MEASURING BODY COMPOSITION IN LIVE BIRDS

机译：影响活鸟身体成分总电导率技术精密度的一些因素

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摘要

Measurement of total body electrical conductivity (TOBEC) is a simple nondestructive method for estimating total body fat in live birds. Some published validations of the TOBEC technique have been promising, but other results, especially from species less than 100 g live mass, have indicated that TOBEC measurements add little to the accuracy of body fat estimates obtained with other nondestructive methods. We examined the accuracy of TOBEC body fat estimates for small birds by validating the technique on two passerine species, House Sparrows (Passer domesticus) and European Starlings (Sturnus vulgaris). Lean mass explained only 57% of the variation in TOBEC for sparrows (average mass: 28,4 g) and 74% of the variation for starlings (average mass: 83.7 g). TOBEC measurements were not sufficiently precise to detect even large (i.e., 100%) changes in fat reserves of either sparrows or starlings. These results, when compared with validations for larger species, indicate that the precision of body composition estimates from TOBEC is very sensitive to subject size in relation to chamber size (coil diameter) of the TOBEC instrument; precision is greatest for subjects that nearly fill the chamber. We confirm that accuracy of TOBEC estimates of body composition in a variety of bird species depends on developing species-specific calibration curves; precision of estimates depends on use of a TOBEC chamber size appropriate to the study species.
机译：全身电导率（TOBEC）的测量是一种简单的无损估计活禽体内总脂肪的方法。 TOBEC技术的一些已发表的验证是有希望的，但是其他结果，特别是来自活体重量小于100 g的物种的其他结果表明，TOBEC的测量值几乎没有增加通过其他非破坏性方法获得的人体脂肪估计的准确性。我们通过验证麻雀（Passer domesticus）和欧洲Star鸟（Sturnus vulgaris）这两个雀形目物种的技术，检查了TOBEC体脂肪估计值对小型鸟类的准确性。麻雀的瘦体重仅解释了TOBEC变化的57％（平均质量：28.4 g），而八哥的瘦体重的解释了74％（平均质量：83.7 g）。 TOBEC的测量不够精确，无法检测到麻雀或八哥的脂肪储量的大变化（即100％）。与较大物种的验证结果相比，这些结果表明，TOBEC估算的身体成分的精度对受试者的尺寸相对于TOBEC仪器的腔室尺寸（线圈直径）非常敏感；对于几乎充满房间的被摄对象，精度最高。我们确认，TOBEC估计各种鸟类的身体成分的准确性取决于制定的特定于物种的校准曲线；估算的精确度取决于使用适合研究物种的TOBEC腔室尺寸。

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