The Vitamin A and E Forms Influence Differently the Plasma Vitamin Concentrations in Newly Received Calves
- 1 Universidad Autónoma de Chihuahua, Mexico
- 2 Universidad Autónoma de Baja California, Mexico
- 3 University of California-Davis, United States
Ten Holstein steer calves (105±3 kg) were used to evaluate bioavailability of two Vitamin A or E forms, “natural” (EA1) or “synthetic” (EA2), based on plasma vitamin concentrations during a 3-d period post injection(subcutaneous). Plasma retinyl palmitate and plasma Vitamin A concentration (retinol equivalent of all forms) was greater 24 and 48 h (P<0.01) post injection of retinyl palmitate vs retinyl propionate. Likewise, plasma retinol was greater (P = 0.04) 72 h post injection of retinyl palmitate. Plasma retinyl propionate was undetected for either treatment, indicative that it is not absorbed as a parent compound. Plasma retinyl palmitate, retinol and total Vitamin A concentrations peaked 24 h (P<0.01) post injection, decreasing toward baseline levels by 72 h post injection. Plasma tocopherol concentration was greater 24 h post injection (P<0.01) for calves injected with D-α-tocopherol vs DL-α-tocopherol. Levels were not different among treatments 48 h post injection (P>0.10). Plasma tocopherol concentrations were maximal (P<0.01) 24 h post injection of D-α-tocopherol, promptly decreasing by 72 h post injection (a level comparable to that observed with DL-α-tocopherol injection). We concluded that based on plasma concentrations, bioavailability of parenterally supplemented retinyl palmitate and D-α-tocopherol are greater than that of retinyl propionate and DL-α-tocopherol under acute Vitamin A or E supplementation.
Copyright: © 2021 Lorenzo Buenabad, Alberto Barreras, Alejandro Plascencia and Richard Avery Zinn. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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- Holstein Calves
- Retinyl Palmitate and Propionate