SciELO - Scientific Electronic Library Online

vol.34 issue3Effect of diets containing whole cottonseed on the quality of sheep semenSuperovulatory response, production and quality of embryos of cows fed on linseed or canola seed supplemented diets author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Acta Scientiarum. Animal Sciences

On-line version ISSN 1807-8672


VIDAL, Luiz Vítor Oliveira et al. Mathematical modeling for digestible energy in animal feeds for tilapia. Acta Sci., Anim. Sci. [online]. 2012, vol.34, n.3, pp.313-319. ISSN 1807-8672.

The objective of this study was to formulate a mathematical model to estimate digestible energy in animal feeds for tilapia. Literature results were used of the proximate composition of crude protein, ether extract, mineral matter and gross energy, as well as digestible energy obtained in biological assays. The data were subjected to stepwise backward multiple linear regression. Path analysis was performed to measure the direct and indirect effects of each independent variable on the dependent one. To validate the model, data from independent studies and values obtained from a digestibility trial with juvenile Nile tilapia testing five meat and bone meals (MBM) were used, using the Guelph feces collecting system and chromium oxide (III) as an indicator. The obtained model is described below and cannot estimate digestible energy (DE) of animal origin: DE (kcal kg-1) = -2364.970+1.287xGE;R2 = 0.775. The path coefficients were medium or low, the highest direct effect was from gross energy (0.529), while the highest indirect effect was from crude protein, through gross energy (0.439).

Keywords : nutrition; nutritional value; estimate; linear models.

        · abstract in Portuguese     · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License