Abstract
Abstract Liquid feed concentrates and supplements were analyzed for total vitamin A content, and relative biopotencies were calculated from maleic values determined on those products. The initial relative biopotencies were from 65 to 97% for concentrates and 57 to 85% for supplements. Even when total vitamin A content decreased, storage up to 47 weeks had relatively small effect on relative biopotencies. A single correction factor could not be applied to relate vitamin A analytical data to vitamin A biopotency. Small quantities of anhydroretinol, vitamin A ether, and other unidentified types of vitamin A were found in several liquid feed products. On some samples spectrophotometric determinations yielded values in the same general range as calculated values based on relative biopotencies, but in a few instances the relationship was poor.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
