IMMEDIATE RESPONSE OF THE PLASMA PROLACTIN LEVEL TO STEROID HORMONE INFUSION IN MALE AND FEMALE CATTLE

1973 ◽  
Vol 71 (4_Suppl) ◽  
pp. S38
Author(s):  
D. Schams ◽  
V. Reinhardt
Keyword(s):  
Prolactin Level ◽  
Steroid Hormone ◽  
Plasma Prolactin ◽  
Male And Female ◽  
Plasma Prolactin Level ◽  
Female Cattle ◽  
Immediate Response

THE IMMEDIATE RESPONSE OF THE PLASMA PROLACTIN LEVEL TO OESTROGEN INFUSIONS IN DAIRY COWS

1972 ◽  
Vol 69 (1) ◽  
pp. 47-52 ◽  
Author(s):  
D. Schams ◽  
H. Karg
Keyword(s):  
Blood Plasma ◽  
Dairy Cows ◽  
Prolactin Level ◽  
Fold Increase ◽  
Plasma Prolactin ◽  
Plasma Samples ◽  
Subsequent Increase ◽  
Plasma Prolactin Level ◽  
Immediate Response ◽  
In Blood Plasma

ABSTRACT Prolactin in blood plasma samples obtained from cows was determined by radioimmunoassay. During infusion of 2 mg or 4 mg 17β-oestradiol/hour there was a depression of the prolactin level, which seemed to be pronounced during infusions of 6 or 12 mg 17β-oestradiol/3 hours. In the experiments in which 2-6 mg 17β-oestradiol were administered a 2-5 fold increase in the plasma prolactin concentrations occurred after the infusions were completed. In the experiment with 12 mg 17β-oestradiol the depression was sustained for 3 hours after infusion; the subsequent increase the next few hours was comparatively small.

THE IMMEDIATE RESPONSE OF THE PLASMA PROLACTIN LEVEL TO OESTROGEN AND PROGESTERONE INFUSIONS IN BULLS

1974 ◽  
Vol 76 (2) ◽  
pp. 242-247 ◽  
Author(s):  
D. Schams ◽  
V. Reinhardt ◽  
H. Karg
Keyword(s):  
Prolactin Level ◽  
Plasma Prolactin ◽  
Subsequent Increase ◽  
Plasma Prolactin Level ◽  
Dose Dependent Increase ◽  
Dose Dependent ◽  
Immediate Response

ABSTRACT The technique of radioimmunoassay was used to determine prolactin concentration in plasma taken from bulls during and after infusions of oestradiol-17β and progesterone. During the infusion of oestradiol-17β (0.5, 1 and 2 mg) for 1 h the concentration of prolactin in the plasma fell, but showed an immediate increase of up to 6-fold after the infusion was completed. A dose-dependent increase (up to 20-fold) in prolactin concentration was observed after the infusion for 1 h of 5, 10, 40 and 80 mg progesterone. In those experiments in which 40 and 80 mg were administered the depression normally seen during the infusion was sustained for 2–3 h and the subsequent increase during the next few hours was comparatively small.

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