scholarly journals Daily sperm production and epididymal sperm reserves of pubertal and adult rats

Reproduction ◽  
1978 ◽  
Vol 54 (1) ◽  
pp. 103-107 ◽  
Author(s):  
G. W. Robb ◽  
R. P. Amann ◽  
G. J. Killian
Keyword(s):  
Sperm Production ◽  
Epididymal Sperm ◽  
Adult Rats ◽  
Daily Sperm Production

Testicular and epididymal sperm content in grazing Cashmere bucks: seasonal variation and prediction from measurements in vivo

1994 ◽  
Vol 6 (6) ◽  
pp. 727 ◽  
Author(s):  
SW Walkden-Brown ◽  
BJ Restall ◽  
WA Taylor
Keyword(s):  
Seasonal Variation ◽  
Seasonal Pattern ◽  
Sperm Production ◽  
Epididymal Sperm ◽  
Scrotal Circumference ◽  
Indirect Measures ◽  
Significant Seasonal Variation ◽  
Testicular Weight ◽  
Daily Sperm Production

Each month, for 15 months, the testes and epididymides were recovered from five Australian cashmere bucks selected at random from a group of mature bucks (initial n = 116) at pasture (location 29 degrees S, 153 degrees E). The extent of seasonal change in testicular and epididymal sperm reserves was determined and indirect methods for predicting these reserves were developed. Paired testicular weight exhibited clear seasonal variation from 137 g in August to 269 g in February. The total elongated spermatid content of the testes, determined by homogenization, showed a very similar seasonal pattern, ranging from 13.8 x 10(9) in September to 36.2 x 10(9) in March. Seasonal changes of similar timing were observed for paired epididymal weight and sperm content. Although changes in total testicular spermatid content were largely the result of change in testicular weight (R2 = 0.72, P < 0.001), the elongated spermatid content of testicular parenchyma (mean, 127 x 10(6) g-1) exhibited significant seasonal variation with elevated values between February and June, suggestive of an increase in the efficiency of spermatogenesis. Daily sperm production, calculated by means of a spermatogenic time divisor for sheep, ranged from 2.76 x 10(9) in September to 7.23 x 10(9) in February. Scrotal circumference, scrotal volume and testicular length x diameter2 were identified as accurate predictors of testicular weight (R2 > or = 0.87) and sperm content (R2 > or = 0.70). The results demonstrate that: (a) cashmere bucks exhibit considerable seasonal variation in spermatogenesis associated primarily with changes in testicular mass but also with changes in the efficiency of spermatogenesis; and (b) indirect measures of testicular size are good predictors of testicular elongated sperm content. When the correct spermatogenic time divisor for goats is determined, such indirect measures may be used to predict daily sperm production.

Studies on the gonadal and epididymal sperm reserves of Mujjafaranagri rams

1987 ◽  
Vol 108 (2) ◽  
pp. 331-334
Author(s):  
S. K. Jindal
Keyword(s):  
Tunica Albuginea ◽  
Sperm Production ◽  
Epididymal Sperm ◽  
Sexually Mature ◽  
Daily Sperm Production

SummaryTesticular and epididymal sperm reserves were determined in six sexually mature Mujjafaranagri rams. The testes and epididymides weight were 151·4±5·49 and 20·7±0·164 g respectively. The total spermatids/g were 78±21·8×106, while daily sperm production per ram was estimated to be 4·46×109 when corrected for tunica albuginea weight. The number of spermatozoa in the caput, corpus and cauda epididymides were 3·18, 2·56 and 16·29×lO9 respectively and they represented 14·4, 11·6 and 73·9% respectively of the sperm reserves on that side. The total epididymal sperm reserve per male ram was about 44·06×109 spermatozoa.

scholarly journals Number and function of Sertoli cells, number and yield of spermatogonia, and daily sperm production in three breeds of boar

Reproduction ◽  
1996 ◽  
Vol 107 (1) ◽  
pp. 137-149 ◽  
Author(s):  
O. E. Okwun ◽  
G. Igboeli ◽  
J. J. Ford ◽  
D. D. Lunstra ◽  
L. Johnson
Keyword(s):  
Sertoli Cells ◽  
Sperm Production ◽  
And Function ◽  
Daily Sperm Production

scholarly journals Knockout of Murine Mamld1 Impairs Testicular Growth and Daily Sperm Production but Permits Normal Postnatal Androgen Production and Fertility

2017 ◽  
Vol 18 (6) ◽  
pp. 1300 ◽  
Author(s):  
Mami Miyado ◽  
Kaoru Yoshida ◽  
Kenji Miyado ◽  
Momori Katsumi ◽  
Kazuki Saito ◽  
...  
Keyword(s):  
Sperm Production ◽  
Testicular Growth ◽  
Daily Sperm Production

scholarly journals Determination of Daily Sperm Production (DSP) in Rabbit (Oryctolagus cuniculus) Bucks using Testicular Parameters

2015 ◽  
Vol 5 (4) ◽  
pp. 141-148
Author(s):  
Olumuyiwa Joseph Olarotimi ◽  
◽  
Olujide Adedamola Sokunbi ◽  
Abdur-Rahman Abdullah ◽  
◽  
...  
Keyword(s):  
Oryctolagus Cuniculus ◽  
Sperm Production ◽  
Daily Sperm Production
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