mouse ≈35,000: rat ≈350,000 spermatogonia
||de Rooij DG, Russell LD. All you wanted to know about spermatogonia but were afraid to ask. J Androl. 2000 Nov-Dec21(6):776-98 p.780 right column top paragraphPubMed ID11105904
||Tegelenbosch RA, de Rooij DG. A quantitative study of spermatogonial multiplication and stem cell renewal in the C3H/101 F1 hybrid mouse. Mutat Res. 1993 290 :193–200.PubMed ID7694110
||Primary source abstract: "In whole mounts of seminiferous tubules of C3H/101 F1 hybrid mice, spermatogonia were counted in various stages of the epithelial cycle. Furthermore, the total number of Sertoli cells per testis was estimated using the disector method."
||P.780 right column top paragraph: "A mouse testis contains about 35,000 As spermatogonia (primary source). In a rat testis weighing about 10 times more, one can speculate
that there will be about 350,000 stem cells per rat testis."