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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 reaction time (A), ejaculate volumen (B), sperm concentration (C) and percentages of motile sperm cells (D), viable sperm cells (E), normal sperm cells (F), non-intact acrosome sperm cells (G), total sperm output (TSO, (H)), total motile sperm count (TMSO, (I)), total functional sperm fraction (TFSF, (J)), and seminal plasma antioxidant capacity (TAC, (K)) for different levels of dietary supplemental proline. DM = dry matter, OL = optimum level of dietary supplemental proline, 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.