Vitamin A
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چکیده
1. Vitamin A is the generic term designating any compound with beta-ionone structure having qualitatively the biological activity of retinol. The recommended posology is 10 000 to 20 000 IU/kg bw in calves and adult cattle, 6 000 IU/kg bw in sheep and goats, 1 500 IU/kg bw in horses, 2 000 to 3 000 IU/kg bw in pigs, poultry and rabbits either by oral, intramuscular and subcutaneous routes. Vitamin A is generally used as esters such as acetate, propionate and palmitate. It is also authorized as feed additive at the maximum concentration of 13 500 IU/kg of complete feed for all domestic species and 25 000 IU/kg in milk replacer for calves.
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