Blood Levels of Prolactin, LH and Progesterone in Cows Before, During and After Normal Resp. Corticoid-Induced Parturition
Plasma levels of progesterone (competitive protein-binding), prolactin and LH (radioimmunoassays) were determined in the peripheral blood of cows. Concerning progesterone a steady decline during the last weeks of pregnancy was followed by a sharp drop just at time of parturition reaching basic levels, which continued for the following days. LH-levels were continuously low until the first “preovulatoric peak” occured at the end of the first or during the second week post partum. Prolactin shows its typical pattern of diurnal variation and of absolute values before and after delivery; a most accentuated peak could always be observed immediately at the time of parturition.
Prolactin-, LH- und Progesteronblutspiegel bei Kühen vor, während und nach der normalen bzw. corticoidinduzierten Geburt
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