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. 2021 Feb 2;11(2):373. doi: 10.3390/ani11020373

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Dose–response curve of rectal temperature (A), respiratory rate (B), haemoglobin concentration (C), and red blood cell counts (D) for different levels of dietary supplemental proline. DM = dry matter, OL = optimum level of dietary supplemental proline and CI = confidence interval. R² = regression value, and x and y are the dependent variable (proline level) and the independent variable of the regression equation, respectively. The figure only shows significant (p < 0.05) relationships.