Table 3.

Conversion ratios of germ cell types (×106 per testis) in adult wild-type testes

Germ cells	Ratios	Measured	Theoretical
ES 9–16:	28.4 : 25.6	1.1	1
RS 1–8 =
RS 1–8:	25.6 : 7.4†	3.5	4
Pach + Dip =
Lep-Dip Spc:	9.4 : 2.9	3.2	4*
Spg/Prl Spc =

^*Based on estimated spermatogonial divisions from Kluin et al. (1984), de Rooij & Grootegoed (1998) and de Rooij & Russell (2000).

ES 9–16 = elongating spermatids in stages IX–XVI of spermiogenesis; RS 1–8 = round spermatids in stages I–VIII of spermiogenesis; Pach + Dip = pachytene and diplotene primary spermatocytes; Lep-Dip Spc = leptotene to diplotene spermatocytes; Spg/Prl Spc = spermatogonia and preleptotene spermatocytes.

^†Excludes leptotene primary spermatocytes, which = 1.94.