Well, rats maturity usually started around the age of 45 days depending on the bride.

Spermatogenesis  lasts approximately 9 and 11 days.

 ZENG X, et-al, The Length of the Spermatogenic Cycle Is Conserved in Porcine

and Ovine Testis Xenografts. J Androl 2006;27:527–533

Dear Ossama,

At first, I appreciate your answer.

As you know, the puberty is  about 45 days and maturity is around 80-9- depending on the bride.

and i found my question last night:

I will write it in present article,

in the rat, one cycle of spermatogenesis takes about 56-58 days. 

Seminiferous epithelium = 12-14 days * 4.7 cycles= 56-60 days

Regards,

Mehdi

46 days

 Dear Friend, MArco,

would you please tell us how did you calculate 46 days for rat spermatogeneses?

Regards,

Mehdi

Dear Mohammad,

The timing for mouse and rats in reproductive biology are sometimes quite similar. In this case, in mice the duration of the spermatogenesis cycle is well defined, and it takes 43 days (In Vivo Notch Signaling Blockade Induces Abnormal Spermatogenesis in the Mouse).

In rats, what I know is the duration of the cycle of the seminiferous epithelium in the Sprague-Dawley (12.9 days; Clermont and Harvey,1965). In the spermatogenesis you have at least 4 cycles so I think that your calculations are correct...12,9*4= 51,6

My Dear Friend, Gonzalo,

Yes, your right, as I previously mentioned there are 4.7 cycles! on the other hand, we have to pay attention to this issue that the number of seminiferous epithelium in most of the mammals is between 12-14 days and as you refer to the Sprague-Dawley Rats which is 12.9; then it will be 51.6 to 56- 60 days finally.

Thank you so much, Friend

I hope these files will help you, with regards 

Ali

http://www.tandfonline.com/doi/pdf/10.3109/01485018508988291?redirect=1

DEar Dr ALi,

Thank you so much for your effort.

Best Regards,

Mehdi

Welcom 

hank you so much for your effort.

Best Regards,

Mustafa

Dear Mohammad:

There are variations according to the strain of rats you are working ; 46 days is spermatogenesis of Holtzman strain with which I did my thesis. The most complete study is published in Volume I of the book The Testis , Chapter 6: Spermatogénesis,  authors: Courot  M., Hochereau Reviers M.T. and Ortavant,  R. edited by Johnson A.D. , Gomes W.R. and  Vandemark N.L. , Academic Press , 1970

Marco A. García-Hjarles

Hi Mohammad. Please chek this file, I think It is useful for your research.

Good luck 

Dear Friends,

I so appreciate all of your kindness to reply this question, but, indeed, I design this main question for some of our friends who published some manuscripts without consideration of spermatogenesis period, unfortunately!!! then as our friends conveyed, firstly it depends to strain of rats and/or mice; for example; Robb et al (1978) reported that Wistar rats are not sexually mature until 100 days. Sexually mature rats had testes weighing 3.7 g, produced 86 x106 spermatozoa or 24 x106 spermatozoa/g testicular parenchyma daily, and their paired epididymides contained 295x106 spermatozoa in the head + body and 440 x106 spermatozoa in the tail.

I think this question done its mission.

Thanks for your cooperation.

Best wishes,

Mehdi

Also found it useful.

Thank you.

Dear Anisah,

Bench of thanks,

Mehdi

Very useful

Thank you for expression.

So useful to me

@Perowei: my pleasure. Regards. Mehdi

@Mohammad: Sir, I would like to know the best specie of rat for reproductive study.

Dear Power,

In fact, I don't believe in rats or other rodents as a suitable model for human reproductive indices, because of their various endocrine systems as compared with those in men and women (i.e., steroid hormones,...). Hence, the best model is Monkeys or apes which are rare in our countries or difficult to work for all researchers. Hence, these days Laboratory rodents are considering as a model for reproductive indices. as I know, many countries have Wistar rats, Sprague-Dawley (SD) rats, and BALB/c mice that make these strains of rats and mice available for studies. The only important thing that we should consider is their spermatogenesis duration, puberty, and time of maturity involved in your treatment periods.

Regards,

Mehdi