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Title of the paper: <b>Seasonal influences on blood plasma progesterone concentration in ewes of Black headMutton sheep breed</b> (short communication) In 71 Black head mutton sheeps on pasturing and housing were determined from the year 1995 to 1997 andthere in the period from March to October the concentration of blood progesterone for determination of onset ofestrus. The level of blood progesterone reported, on literature also, no cycle on this period. The investigation of6 of this sheeps with ultrasonography had the result of ovarian activity with follicles from 2 mm to 7 mm indiameter, but no cycle was determined.  The progesterone level of minimum and maximum on all years differed from March to beginning of Septemberbetween 0,33 ng/ml and 2,15 ng/ml blood progesterone, after this to October between 0,82 ng/ml and 4,25 ng/mlblood progesterone.  The pregnant sheeps detected blood progesterone concentrations from 5,50 ng/ml to 13,55 ng/ml bloodprogesterone (twins). The corpus luteum activity may be is prevalent on the blood progesterone level up 2 ng/mland pregnancy up 5 ng/ml blood progesterone.  The detectability of blood progesterone and supplemented ultrasonography of ovary possess the possibilityrecording of onset cycle activity and early pregnancy diagnosis

Saisonale Einflüsse auf die Konzentration von Progesteron im Blutplasma von Müttern der Rasse Schwarzköpfiges Fleischschaf (Kurzmitteilung)