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  • Title: Plasma erythropoietin levels in mice during the growth period.
    Author: Meberg A, Hågå P, Johansen M.
    Journal: Br J Haematol; 1980 Aug; 45(4):569-74. PubMed ID: 7191715.
    Abstract:
    Plasma erythropoietin (erythropoiesis stimulating factor(s), ESF), PCV and body weight were measured in normal mice from birth until the age of 70 d. Low but detectable ESF activity was present at birth, following by undetectable levels 12-48 h after birth. Thereafter the ESF level rapidly increased. Peak levels were obtained 15-20 d after birth. During the same phase an increased growth velocity occurred, coincident with decreased PCV levels. A fall to undetectable levels in plasma ESF activity coincided with decelleration of growth 40-50 d after birth. In small litters (four pups per litter) growth velocity and PCV levels were significantly higher than in large litters (16 pups per litter) 8 and 15 d after birth. The plasma ESF activity, however, did not differ between the two groups. Prohibiting suckling for a period of 16 h did not change the plasma ESF level. The hypothesis is put forward that growth directly or indirectly stimulates ESF production.
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