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Inverse relationship between fluids (plasma and milk): Retinol average concentration (μg/mL) of the three management systems (MG, CM, TMR) and α-tocopherol concentration (μg/mL) in the TMR group at three sampling times. Management systems: MG (mountain grazing + feed supplement), CM (meadow pasture + feed supplement) and TMR (total mixed ration). Sampling times: M1 (the day of parturition), M2 (at 10 days of lactation) and M3 (at 30 days of lactation).
