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Corpora lutea (CL) from naturally cycling Corriedale ewes were obtained in the mid- and late luteal phases of the oestrous cycle (Days 9 and 13; 5 ewes per group). The cellular composition of these CL was compared by ultrastructural morphometry to determine whether there were changes in numbers of large and small luteal cells consistent with differentiation of some small luteal cells to large luteal cells during the last part of the luteal phase. No differences between Days 9 and 13 were detected in luteal volume, plasma progesterone concentration, or volume density of any component of the luteal tissue. Large luteal cell numbers (mean +/- s.e.m.) were lower per unit volume of luteal tissue on Day 13 than on Day 9 (14.1 +/- 0.5 vs 18.4 +/- 1.3 X 10(3)/mm3, P less than 0.05). Mean volume of the individual large luteal cells was greater on Day 13 than on Day 9 (19.65 +/- 0.72 vs' 15.60 +/- 1.34 micrograms 3 X 10(3), P less than 0.05). However, there were no significant differences in numbers or volumes of small luteal cells between Days 9 and 13, and total numbers of large luteal cells per CL were not different between these two days. These results provide no support for the hypothesis that small luteal cells differentiate into large luteal cells during the oestrous cycle of the sheep.

Cellular composition of the sheep corpus luteum in the mid- and late luteal phases of the oestrous cycle