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Modeling nutritional and performance factors that influence the efficiency of weight gain in relation to excreted nitrogen in weaning piglets

Published online by Cambridge University Press:  19 July 2019

K. M. Cardinal Open the ORCID record for K. M. Cardinal [Opens in a new window] ,
M. S. Vieira ,
M. B. Warpechowski ,
P. K. Ziegelmann ,
L. Montagne ,
I. Andretta  and
A. M. L. Ribeiro
K. M. Cardinal
Affiliation:
Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, RS 91540-000, Brazil
M. S. Vieira
Affiliation:
Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, RS 91540-000, Brazil
M. B. Warpechowski
Affiliation:
Department of Animal Science, Federal University of Paraná, Curitiba, PR 80035-050, Brazil
P. K. Ziegelmann
Affiliation:
Department of Statistic, Federal University of Rio Grande do Sul, Porto Alegre, RS 91509-000, Brazil
L. Montagne
Affiliation:
INRA/AgrocampusOuest, UMR 1079, Systèmes d’Elevage, Nutrition Et Humaine, F. 35000 Rennes, França
I. Andretta
Affiliation:
Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, RS 91540-000, Brazil
A. M. L. Ribeiro
Affiliation:
Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, RS 91540-000, Brazil
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Abstract

One of the most debated topics in pig production is the need to study, understand and change the production system in order to improve nutrient efficiency, becoming more environmentally friendly. The nitrogen excretion has highly deleterious effects on the environment, and it is necessary to develop tools that help to reduce the excretion of this compound without compromising productivity. Therefore, two models were generated to estimate the efficiency of weight gain in relation to excreted nitrogen in post-weaning piglets. Data for testing these models were obtained from previous master and PhD studies carried out at the Federal University of Rio Grande do Sul, Animal Science Laboratory using piglets in the post-weaning phase with results for performance and digestibility. The database that was constructed was composed of raw data from 10 studies carried out between 2000 and 2016, on a total of 726 piglets weaned at ages between 17 and 28 days, and to which 62 different treatments were applied. An exploratory analysis of the data was done by evaluating scatter plots and histograms, and variables representing different treatments were used in a stepwise multiple linear regression analysis, with the F-test used as the selection criterion. Two models were generated that either considered the nitrogen retained or not, to estimate the ratio between weight gain and excreted nitrogen using generalized linear model procedure. The authors analyzed the behavior of each variable to evaluate whether the equation generated was biologically coherent. Weight gain, dry matter intake, nitrogen intake, metabolizable energy intake, retained nitrogen and urinary nitrogen were all significant (P<0.001) variables in model I, and in model II the variable fecal nitrogen was also included. The models had high coefficients of determination (R2 of model I and II were 0.9013 and 0.8271, respectively), and the nitrogen ingested variable was the one that most strongly influenced growth efficiency. When the retained nitrogen variable was removed from the model, there was a reduction in the fit of the equations. It was possible to conclude that both of the two models generated could be applied and the amount of nitrogen ingested had the greatest influence on growth efficiency related to nitrogen excretion.

Keywords

meta-analysisnutritionproteinpollutantswine
Type
Research Article
Information
animal , Volume 14 , Issue 2 , February 2020 , pp. 261 - 267
Copyright
© The Animal Consortium 2019 

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Footnotes

†

Present address: Faculdade de Agronomia, Avenida Bento Gonçalves, 7712 – Agronomia, RS 91540-000, Brazil. E-mail: katia.zootecnia@hotmail.com

*

In the original article Ziegelmann was spelled incorrectly. The spelling has subsequently been corrected.

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