Íslenskar landbúnaðarrannsóknir - 01.09.1981, Síða 34

32 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR
SUMMARY
Seasonal variation of selenium in the blood of
sheep. Experiment at Hvanneyri in 1980
Guðný Eiríksdóttir
Baldur Símonarson
and
Þorsteinn Þorsteinsson
Institute of Experimental Pathology
Keldur, Reykjavík,
Bjarni Guðmundsson
and
JÓN VlÐAR JÓNMUNDSSON
Hvanneyri.
The selenium status in ewes during
pregnancy was investigated at the ex-
perimental farm at the Agricultural Col-
lege at Hvanneyri 1979—1980. The ewes
were fed silage or hay, both groups re-
ceiving supplementary feeding (cereal
based conceutrecter) in spring and half of
the ewes received supplementation during
the mating season.
HEIMILDIR:
Buck, E. L., J. A. Schmitz og L. V. Swanson, 1980:
Incorporation of 75 Se into endocrine and repro-
ductive tissues of the prepartum ewe and fetus.
Abstract. 2nd Int’ 1 Symp. on Selenium in bio-
logy and medicine, Lubbock, Texas.
Carlström, G., G. Jönsson og B. Pehrson, 1979: An
evalution of selenium status of cattle in Sweden
by means of glutathione peroxidase. Swedish J.
Agric. Res., 9: 43—46.
Flohé, L., W. A. Gúnzler og H. H. Schock, 1973:
Glutathione peroxidase: A selenoenzyme. FEBS
Lett., 32: 132—134.
Godwin, K. 0., R. E. Kuchel og R. A. Buckley, 1970:
The effect of selenium on infertility in ewes
grazing improved pastures. Aust. J. Exp. Agric.
Anim. Husb., 10: 672—678.
Hoekstra, W. G., 1975: Biochemical function of sel-
Glutathione peroxidase (GPx) activity
in blood samples taken from the ewes
three times during pregnancy showed a
pronounced decrease from 118 IU/g Hb
in January to 66 IU/g Hb in March and
íinally to 44 IU/g Hb in May. There was
no difference GPx activities between the
two groups. This decrease during pregn-
ancy was greater than in rams where GPx
activity in March was 112 IU/g Hb and
102 IU/g Hb in May.
After grazing highland pastures during
the summer GPx activities in the blood of
the ewes increased to 140 IU/g Hb.
The selenium concentration determin-
ed in feed samples taken during the indoor
feeding season was always less than 80
ng/g except in the April hay sample. Total
selenium in the feed was increased by
supplementation, but addition during the
mating season had no influence on GPx
activities during pregnancy.
enium and its relation to vitamin E. Fed. Proc.,
34 (11): 2083—2089.
Julien, W. E., H. R. Conrad, J. E. Jones og A. L.
Moxon, 1976: Selenium and vitamin E and in-
cidence of retained placenta in parturient dairy
cows. J. Dairy Sci., 59 (11): 1954—1959.
Keshan Disease Research Group, 1979: Observations on
eífect of sodium selenite in prevention of Keshan
disease. Chinese Med. J., 92 (7): 471—476.
Kurkela, P. og E. Kaantee, 1979: The selenium cont-
entofskeletal (Gluteal) muscle ofFinnish reinde-
er and cattle. Zbl. Vet. Med. B, 26: 169—173.
Oh, S. H., R. A. Sunde, A. L. Pope og W. G. Hoekstra,
1976: Glutathione peroxidase response to selen-
ium intake in lambs fed a torula yeast-based,
artificial milk. J. Anim. Sci., 42: 977—983.
Oksanen, H. E., 1980: Selen — husdjurens försörj-