The plasma cortisol concentrations tended to increase in the CON group as the high-temperature period progressed, whereas a decreasing trend was observed in September for both the TRT 1 and TRT 2 groups.
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Effect of Rumen-Protected L-Tryptophan or L-Ascorbic Acid on Plasma Metabolites and Milk Production Characteristics of Lactating Holstein Cows during Summer Conditions
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