TY  - JOUR
A1  - Mueller, K.
A1  - Raila, Jens
A1  - Altenkamp, Rainer
A1  - Schmidt, D.
A1  - Dietrich, R.
A1  - Hurtienne, Andrea
A1  - Wink, M.
A1  - Krone, O.
A1  - Brunnberg, Leo
A1  - Schweigert, Florian J.
T1  - Concentrations of retinol, 3,4-didehydroretinol, and retinyl esters in plasma of free-ranging birds of prey
JF  - Journal of animal physiology and animal nutrition
N2  - This study investigated vitamin A compounds in the plasma of healthy free-ranging Central European raptors with different feeding strategies. Plasma samples of nestlings of white-tailed sea eagle [white-tailed sea eagle (WTSE), Haliaeetus albicilla) (n = 32), osprey (Pandion haliaetus) (n = 39), northern goshawk (Accipiter gentilis) (n = 25), common buzzard (Buteo buteo) (n = 31), and honey buzzard (Pernis apivorus) (n = 18) and adults of WTSE (n = 10), osprey (n = 31), and northern goshawk (n = 45) were investigated with reversed-phase-high-performance liquid chromatography (RP-HPLC). In WTSE, northern goshawks and common buzzards retinol were the main plasma component of vitamin A, whilst in ospreys and honey buzzards, 3,4-didehydroretinol predominated. The median of the retinol plasma concentration in the nestlings group ranged from 0.12 to 3.80 mu M and in the adult group from 0.15 to 6.13 mu M. Median plasma concentrations of 3,4-didehydroretinol in nestlings ranged from 0.06 to 3.55 mu M. In adults, northern goshawks had the lowest plasma concentration of 3,4-didehydroretinol followed by WTSE and ospreys. The plasma of all investigated species contained retinyl esters (palmitate, oleate, and stearate). The results show considerable species-specific differences in the vitamin A plasma concentrations that might be caused by different nutrition strategies.
KW  - birds of prey
KW  - plasma
KW  - retinol
KW  - 3,4-didehydroretinol
KW  - retinyl esters
Y1  - 2012
U6  - https://doi.org/10.1111/j.1439-0396.2011.01219.x
SN  - 0931-2439
VL  - 96
IS  - 6
SP  - 1044
EP  - 1053
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Müller, Kerstin E.
A1  - Altenkamp, Rainer
A1  - Raila, Jens
A1  - Schmidt, Daniel
A1  - Dietrich, Robert
A1  - Hurtienne, Andrea
A1  - Wink, Michael
A1  - Krone, Oliver
A1  - Brunnberg, Leo
A1  - Schweigert, Florian J.
T1  - Plasma concentration of alpha-tocopherol in different free-ranging birds of prey
JF  - European journal of wildlife research
N2  - In this study, we investigated the alpha-tocopherol plasma concentrations in healthy free-ranging nestlings of the white-tailed sea eagle (Haliaeetus albicilla) (n=32), osprey (Pandion haliaetus) (n=39), northern goshawk (Accipiter gentilis) (n=25), common buzzard (Buteo buteo) (n=31), and honey buzzard (Pernis apivorus) (n=18) as well as of free-ranging adults of the white-tailed sea eagle (n=10), osprey (n=31), and northern goshawk (n=45). alpha-Tocopherol plasma concentrations were determined by reverse-phase high-performance liquid chromatography. alpha-Tocopherol plasma concentrations in nestlings of osprey, white-tailed sea eagle, and northern goshawk did not differ significantly amongst the species, but the common buzzard and honey buzzard nestlings had significantly lower alpha-tocopherol plasma concentrations than nestlings of the other species (both P<0.001). Adult male ospreys and white-tailed sea eagles had significantly higher alpha-tocopherol concentrations compared to adult females (both P<0.005). Adult ospreys and northern goshawks had significantly higher alpha-tocopherol plasma concentrations compared to their nestlings (both P<0.001). In adult female northern goshawks, plasma concentrations of alpha-tocopherol increased significantly before egg laying (P<0.001). These results demonstrate alpha-tocopherol plasma concentrations in birds of prey to be species specific and influenced by age and reproductive status.
KW  - alpha-Tocopherol
KW  - Birds of prey
KW  - Plasma concentration
Y1  - 2011
U6  - https://doi.org/10.1007/s10344-011-0516-z
SN  - 1612-4642
VL  - 57
IS  - 5
SP  - 1043
EP  - 1049
PB  - Springer
CY  - New York
ER  -