Dynamics of vitamin A in grey seal (Halichoerus grypus) mothers and pups throughout lactation

摘要: Vitamin A concentrations were measured in milk and serum of grey seal (Halichoerus grypus) mothers the their pups sampled 2-6 times between parturition weaning on Isle May, Scotland, 1998 2000. Changes vitamin concentration also followed during postweaning fast. During 18-day lactation period, fasting produced a very rich A. Concentrations 6.3 +/- 1.6 10.1 4.5 mg/kg (mean SD) colostrum (day 0) at late (greater than or equal to11 days), respectively. Surprisingly, increased lactation, even when it was expressed per unit lipids. The mothers' 329 65 mug/L day 0. dropped 3 (228 21 serum), but to 400 121 lactation. At birth, (111 5 mug/L) much lower that mothers, revealing limited placental transfer. pup then throughout 499 96 end nursing period. time, pups' more concentrated serum, reflecting great ingestion. After weaning, over several days stabilized 336 45 mug/L.