Interrelationships among liposoluble vitamins in ruminants

Area of Science:

• Animal Nutrition
• Biochemistry
• Veterinary Medicine

Background:

• Liposoluble vitamins A, D3, and E are crucial for animal health.
• Understanding their interactions and plasma concentration dynamics is important for livestock management.
• Variations in vitamin levels can impact animal well-being and productivity.

Purpose of the Study:

• To investigate the effects of high-dose vitamin D3 and vitamin E administration on plasma vitamin A and E concentrations in sheep.
• To assess the impact of co-administered liposoluble vitamins A, D3, and E on plasma alpha-tocopherol in cattle.
• To characterize seasonal variations and inter/intraindividual variability in plasma liposoluble vitamin concentrations in cattle.

Main Methods:

• Sheep orally or parenterally received a massive single dose of vitamin D3 (5 x 10^6 IU).
• Sheep received a single oral pharmacologic dose of dl-alpha-tocopherol (5 g).
• Cattle received a single IM administration of vitamins A, D3, and E; plasma samples were analyzed for alpha-tocopherol concentrations over time.

Main Results:

• A single massive dose of vitamin D3 caused a temporary decrease in plasma vitamins A and E in sheep.
• High-dose vitamin E administration in sheep led to a transient reduction in plasma retinol, followed by a return to baseline.
• Oral dl-alpha-tocopherol supplementation in sheep resulted in a gradual increase in plasma concentrations.
• Co-administration of vitamins A, D3, and E in cattle did not affect plasma alpha-tocopherol levels within the study's sampling intervals.
• Cattle exhibited a distinct seasonal pattern in plasma alpha-tocopherol, peaking in July.

Conclusions:

• High doses of vitamin D3 and E can transiently alter plasma vitamin A and E levels in sheep.
• Vitamin E supplementation can increase its own plasma levels in sheep.
• Plasma alpha-tocopherol concentrations in cattle are subject to significant seasonal fluctuations.
• Further research is needed to understand the long-term implications and variations in liposoluble vitamin dynamics in livestock.