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MT (melatonin-treated cows); NON-MT (non-melatonin-treated cows). Data expressed as the means ± SEM (n = 10). Values with different superscript letters, such as abrepresent a significant difference within the same group, (P < 0.05); Values with different superscript letters ABrepresent a significant difference between different groups (P < 0.05); The same letters represent no significant difference (P > 0.05).