QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Koong, L. J. Search for Related Content PubMed PubMed Citation Articles by Koong, L. J.

A New Method for Estimating Energetic Efficiencies

Department of Animal Science, University of California, Davis, California 95616

A new method is proposed for estimation of energetic efficiency for fat and lean tissue gains in growing animals. The method involves the partition of metabolizable energy available for growth (MEA) into fat and lean tissue synthesis. The Michaelis-Menten type equation is used to describe the effect of level of MEA on the proportion of MEA being used for fat or lean synthesis. A system of two simultaneous non-linear equations was used to calculate fat gain (FG) and lean gain (LG) as a function of MEA. The partial efficiencies for fat gain (E_f) and lean gain (E₁) as well as the Michaelis-Menten constant (K) were estimated from data obtained from energy balance trials involving two lines of mice by using a non-linear least squares procedure. The results of this study showed that mice, which have been selected for rapid postweaning weight gain, utilized MEA more efficiently for fat and lean tissue syntheses than mice from control groups. At all intake levels, mice from selected lines utilized more of the MEA for fat synthesis than control mice. This new method overcomes some of the problems involved when a multiple regression technique is used for the estimation of partial efficiencies. Upon extension and improvement, the method can be used not only for the estimation of true partial efficiencies, but also for identification of factors that influence how MEA is partitioned for fat and lean energy synthesis.

KEY WORDS: • energetic efficiencies • fat gain • lean gain

Manuscript received 20 July 1976.

This article has been cited by other articles:

				P. A. Azevedo, J. van Milgen, S. Leeson, and D. P. Bureau Comparing efficiency of metabolizable energy utilization by rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar) using factorial and multivariate approaches J Anim Sci, April 1, 2005; 83(4): 842 - 851. [Abstract] [Full Text] [PDF]