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Does choice of estimators influence conclusions from true metabolizable energy feeding trials?

Journal of Ornithology
By: , , and 
https://doi.org/10.1007/s10336-005-0094-5

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Abstract

True metabolizable energy (TME) is a measure of avian dietary quality that accounts for metabolic fecal and endogenous urinary energy losses (EL) of non-dietary origin. The TME is calculated using a bird fed the test diet and an estimate of EL derived from another bird (Paired Bird Correction), the same bird (Self Correction), or several other birds (Group Mean Correction). We evaluated precision of these estimators by using each to calculate TME of three seed diets in blue-winged teal (Anas discors). The TME varied by <2% among estimators for all three diets, and Self Correction produced the least variable TMEs for each. The TME did not differ between estimators in nine paired comparisons within diets, but variation between estimators within individual birds was sufficient to be of practical consequence. Although differences in precision among methods were slight, Self Correction required the lowest sample size to achieve a given precision. Feeding trial methods that minimize variation among individuals have several desirable properties, including higher precision of TME estimates and more rigorous experimental control. Consequently, we believe that Self Correction is most likely to accurately represent nutritional value of food items and should be considered the standard method for TME feeding trials.

Publication type Article
Publication Subtype Journal Article
Title Does choice of estimators influence conclusions from true metabolizable energy feeding trials?
Series title Journal of Ornithology
DOI 10.1007/s10336-005-0094-5
Volume 146
Year Published 2005
Language English
Publisher Springer
Contributing office(s) Northern Prairie Wildlife Research Center
Description 7 p.
First page 383
Last page 389
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