[Concentration of IGF-I and estradiol-17beta in the blood plasma of pregnant cattle].
Blood samples were collected from pregnant cows, heifers and also from non pregnant cows serving as controls. The determination of insulin-like-growth-factor-I (IGF-I) and estradiol-17 beta (E2) were performed immunologically. In the non pregnant cows E2 remained unchanged. IGF-I decreased around parturition and increased again commencing the 6th week of lactation. Compared to nonpregnant animals E2 but not IGF-I was slightly elevated during the first 10 weeks of pregnancy. During the 10th up to 20th week of pregnancy the mean values of IGF-I were increased as well as the ones of E2. During the late pregnancy the values of IGF-I in heifers are obviously more elevated as in lactating pregnant or non-pregnant cows; analogous high values were determined in pregnant cows only during the dry period. Before parturition even a negative correlation exists between IGF-I and E2. It is concluded that IGF-I is predominantly regulated by other factors.
Theyerl-Abele
M
M
Institut für Physiologie der Süddeutschen Versuchs- und Forschungsanstalt für Milchwirtschaft, Technischen Universität München.
Meyer
H H
HH
Schams
D
D
Karg
H
H
D000818:Animals; D002417:Cattle / Q000097:blood*; D004958:Estradiol / Q000097:blood*; D005260:Female; D007334:Insulin-Like Growth Factor I / Q000032:analysis*; D007743:Labor, Obstetric / Q000097:blood; D007774:Lactation / Q000097:blood; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000097:blood*
D004958:Estradiol; D007334:Insulin-Like Growth Factor I
Konzentrationen von IGF-I und Ostradiol-17 beta im Blutplasma des graviden Rindes.