Antivitamin
• Antivitamin is simply a substance that makes a vitamin
ineffective.
• Ascorbic acid oxidase: is a multi-copper enzyme that
catalyzes the oxidation of ascorbic acid to dehydroascorbic
acid
• Thiaminases: are enzmyes found in a few plants and the raw
flesh and viscera of certain fish and shellfish. When ingested
these enzymes split thiamin (Vitamin B1), an important
compound in energy metabolism, and render it inactive.
• Tannins: water-soluble polyphenols that are present in many
plant foods. They have been reported to be responsible for
decreases in feed intake, growth rate, feed efficiency, net
metabolizable energy, and protein digestibility