Table 1 Mean number of isolated or clustered GnRH neurons counted during and after the preovulatory LH surge. Individual values are indicated for each animal during the first (Exp I) and second experiment (Exp II).

Ewe identification n°

376

23

18

61

280

106

47

59

Single GnRH neurons

323

306

383

352

331

427

354

463

Clusters of GnRH neurons

34

47

79

85

34

48

67

103

%

10

15

20

23

10

11

19

22