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Vitamin A status in the grey seal (Halichoerus grypus) on Sable Island.
Investigation of grey seals in the pupping colony on Sable Island, Canada found that in lactating females concentrations of vitamin A in serum, liver and blubber were significantly different than in the other animals, and it is possible that the intensified lipid metabolism during lactation causes these extreme differences.
The majority of vitamin A is transported as retinyl esters in the blood of most carnivores.
In maned wolf cubs it was found that retinol, retinyl esters and alpha-tocopherol increased with the age of the animals, reaching values comparable to adult animals at the ageof 5 months.
Concentrations of vitamin A, beta-carotene and vitamin E in individual bovine follicles of different quality.
By influencing hormone and protein synthesis, vitamin A may have a potential for local modulation of follicular development and therefore be one of the factors controlling recruitment, selection and growth of the dominant follicle in cattle.
Difference in serum ascorbate in two species of Callithricidae.
  • C. Flurer, H. Zucker
  • Biology, Medicine
    International journal for vitamin and nutrition…
  • 1987
In one species each of the subfamilies marmosets and tamarins of the New World monkey family Callithricidae, serum levels of ascorbic acid were compared. Although the feeding regimen had been the
Vitamin A- and beta-carotene concentrations in bovine follicular fluid in relationship to follicle size.
Vitamins A and β-carotene concentrations in serum, in fluid of follicular cysts and in variablysized follicles were determined and it is assumed that this increase in vitamin A occurs in only one follicle per cow, it may well be of importance for oocyte maturation.
Biological activity of glycosides of vitamin D3 and 1 alpha-hydroxyvitamin D3.
For the first time, the biological activity of the newly synthesized glycosides of vitamin D3 and of 1 alpha(OH)D3 has been studied in rats, chickens, and Japanese quails. Glucosidation did not
Light-dependent synthesis of cholecalciferol in a green plant
Cholecalciferol (vitamin D3) and several of its metabolites participate in the regulation of calcium and phosphorus metabolism in higher vertebrates (see refs 1,2 for reviews). In contrast to the
Occurrence of cholecalciferol in the calcinogenic plant Trisetum flavescens.
A more active “bound form” of vitamin D3 may be present in Trisetum flavescens, after a special purification procedure involving high pressure liquid chromatography and continuous biological testing and the active principle was purified.
Transport of β‐carotene by the serum lipoproteins in cattle
Zusammenfassung Transport von β-Carotin durch die Serumlipoproteine des Rindes Die Untersuchung uber den Transport von β-Carotin durch die Serumlipoproteinfraktionen bei Kuhen, Bullen,