By Lee Russell McDowell(auth.)
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Extra resources for Vitamins in Animal and Human Nutrition, Second Edition
Nevertheless, vitamin A supplements should not be stored for prolonged periods prior to feeding. Vitamin A and carotene destruction also occurs from processing of feeds with steam and pressure. Pelleting effects on vitamin A in feed are caused by die thickness and hole size, which produce frictional heat and a shearing effect that can break supplemental vitamin A beadlets and 47 CHAPTER TWO expose the vitamin. In addition, steam application exposes feed to heat and moisture. Running fines back through the pellet mill exposes vitamin A to the same factors a second time.
1991; Ross, 1993). One factor that specifically regulates RBP secretion from liver is the nutritional vitamin A status of the animal. The secretion of RBP from the liver is regulated by estrogen and nutritional status of vitamin A, protein, and zinc. Retinol deficiency specifically blocks secretion of RBP from the liver so that plasma RBP levels fall and liver RBP levels rise. , 1990). This was explained by the fact that dogs and other carnivores transport most of their vitamin A in blood as retinyl esters (mainly retinyl stearate) bound to lipoproteins.
The relative biological activity of vitamin A2 is 40 to 50% that of A1. Vitamin A is a nearly colorless, fat-soluble, long-chain, unsaturated alcohol with five double bonds. The vitamin is made up of isoprene units with alternate double bonds, starting with one in the β−ionone ring that is in conjugation with those in the side chain (Fig. 1). Since it contains double bonds, vitamin A can exist in different isomeric forms. More common isomeric forms of vitamin A and their relative biological activities are presented in Fig.