title: Effects of grinding and storage for one month on retention of vitamin A in premixes and mineral supplements.
abstract: Tested standardized procedures for handling premixes and mineral supplements from time of sampling to time of analysis for vitamin A have not been developed, which could account for some unexplained inconsistent and low analytical results. Grinding premix samples and storing them in a freezer for one month had little effect on amount of vitamin A found, but there was a significant loss (about 10%) after storage for one month at room temperature. Results on replicated determinations of vitamin A in unground and ground mineral supplements and on effect of storage were somewhat more variable than for premixes, but only the loss (about 12%) during storage for one month at room temperature was significant.
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D005511:Food Handling; D008903:Minerals / Q000032:analysis; D014801:Vitamin A / Q000032:analysis*
chemical_list: D008903:Minerals; D014801:Vitamin A