| |
Transit Time, d
|
|
DSP
|
Extragonadal Sperm Reserves in Paired Sides, 106
|
Species
|
Caput Epid
|
|
Corpus Epid
|
Cauda Epid
|
Paired Testes Weight, g
|
By Both Testes, 106
|
Per Gram Parenchyma, 106/g
|
Caput Epid
|
|
Corpus Epid
|
Cauda Epid
|
Vas Deferens
|
| Human |
|
|
|
|
|
|
|
|
|
|
|
|
| Low DSP (J&V) |
— |
2.7 |
— |
3.3 |
35 |
68 |
2.5 |
— |
188 |
— |
224 |
nd |
| Healthy men (A&H) |
0.7 |
|
0.7 |
1.8 |
34 |
125 |
4.2 |
77 |
|
79 |
222 |
nd |
| High DSP (J&V) |
— |
0.8 |
— |
1.1 |
39 |
275 |
8.5 |
— |
192 |
— |
212 |
nd |
| Bull (dairy) |
2.5 |
|
0.6 |
5.2 |
725 |
7500 |
12 |
19 000 |
|
4700 |
38 000 |
7600 |
| Rhesus monkey |
1.1 |
|
3.8 |
5.6 |
49 |
1100 |
23 |
1200 |
|
4200 |
5700 |
2000 |
| Dog (many breeds)b |
0.4 |
|
1.8 |
6.7 |
29 |
490 |
17 |
190 |
|
1740 |
3270 |
180 |
| Rat (Sprague-Dawley) |
— |
3.2 |
— |
8.7 |
3.3 |
75 |
24 |
— |
238 |
— |
649 |
8 |
| Rabbit |
2.2 |
|
0.8 |
9.7 |
6.4 |
160 |
25 |
360 |
|
120 |
1600 |
120 |
| Ram |
2.4 |
|
1.2 |
12.8 |
500 |
9500 |
21 |
23 000 |
|
11 000 |
126 000 |
nd |
Hamster
|
—
|
2.0
|
—
|
13.6
|
3.0
|
74
|
24
|
—
|
150
|
—
|
1020
|
40
|
|
| Abbreviations: A&H, Amann and
Howards, 1980; Epid, epididymidis; J&V, Johnson and Varner
(1988); nd, not determined. |
| aOrder based on transit time through the cauda epididymidis. Updated from
Amann et al (1976), which
contains similar information for other species and references. Additional data
provided for humans (A&H; J&V), dogs
(Amann, 1986), and rats
(Judd et al, 1997). Note that
humans have extraordinary low DSP/g testis parenchyma. |
| bGreat differences among breeds likely due to body weight; values based on 17,
32, and 14 dogs weighing 4–15, 16–27, and 28–38 kg. |
|
