The results were expressed as means ± standard errors of the means (SEM). Statistical analysis of the presented data was performed by using the SPSS computer programs (2007). The independent t-test was used to compare between the two groups and to show the effect of rumen-protected L-arginine oral supplementation. The normal distribution of the data was confirmed using the Kolmogorov–Smirnov test. The p values ≤ 0.05 were considered significant.
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