Table 3.

Length in days (mean ± SEM) of the seminiferous epithelium cycle in different dog breeds

Breed	Time after injection	Most advanced germ cell labelled	Stage of the cycle	No. of cycles traversed	Cycle length based on labelling in leptotene
Mongrel 1
RT	14 days	P	V	1	13.5
LT	26.9 days	R	V	2	13.9
Mongrel 2
RT	14 days	P	V	1	13.5
LT	27 days	R	V	2	13.9
Mongrel 3						= 13.6 ± 0.08
RT	1–2 h	Pl	V	–	–
LT	27 days	R	V	2	13.5
Mongrel 4
RT	1–2 h	Pl	V	–	–
LT	27 days	R	V	2	13.5
Beagle 1
RT	1–2 h	Pl	V
RT	14.2 days	P	V	1	14.1
LT	27.1 days	R	V	2	13.5
Beagle 2						= 13.8 ± 0.17
RT	1–2 h	Pl	V
RT	14.2 days	P	V	1	14.1
LT	27.1 days	R	V	2	13.5
Poodle 1
RT	1–2 h	Pl	V	–	–
RT	14.1 days	P	V	1	14	= 13.8 ± 0.20
LT	27.1 days	R	V	2	13.6
Pinscher 1
RT	1–2 h	Pl	V	–	–
RT	14 days	P	V	1	14	= 13.75 ± 0.25
LT	27 days	R	V	2	13.5
Labrador 1
RT	1–2 h	Pl	V	–	–
RT	14 days	P	V	1	14
LT	27 days	R	V	2	13.5
Labrador 2						= 13.75 ± 0.20
RT	1–2 h	Pl	V	–	–
RT	14 days	P	V	1	14
LT	27 days	R	V	2	13.5
Pit Bull 1
LT	1–2 h	Pl	V	–	–
LT	14.1 days	P	VII	1.2	11.8
Pit Bull 2
RT	1–2 h	Pl	V	–	–
RT	14.1 days	P	VI	1.1	12.7	= 12.55 ± 0.26
LT	14.1 days	P	VI	1.1	12.7
Pit Bull 3						P < 0.03
RT	1–2 h	Pl	V	–	–
LT	26.1 days	R	V	2	13

RT, right testis; LT, left testis. Pl, preleptotene; P, pachytene; R, round spermatids.