Sex determination in rats

Puberty in rat trestles

Kathrin Guttmann General, Knowledge, Breeding & Genetic

Male rats babies should at the age of 4-5 Weeks are separated from their mothers and sisters - it is said among breeders. After the discussion came up in a group, if someone has experienced, that a rat boy aged less than 4 Weeks, a female has successfully met, I thought, it was time, to make a more detailed research on the subject. In the group, some found very few breeders, who reported, with them such a mating would have taken place. But this latter is isolated incidents out of hundreds.

One had said in advance: the actual onset of puberty in rats may vary considerably between different lines. (Suckow 1)Suckow, M. A. The Laboratory Rat). In addition, there are numerous factors, influencing the beginning, he knows z.B. the location of the puppies in the womb, the size of the litter and the availability of feed (Bennett & Vickery, 1970). Bennett & Vickery (1970) found, that the onset of puberty about the achievement of 50% the Endkörpergewichts or. a body length of 148 - 150 mm collapses. Russel (1992) She reported, that the production of sperm did not start until the 45. Of life and optimal production rate begin until the 75. Day is reached. These findings are consistent with those et al Robb (1972)2)G. W. Robb, R. P. Amann and G. J. Killian (1972), Daily sperm production and epididymal sperm reserves of pubertal and adult rats, in Reproduction, Volume 54: Issue 1 reported agreement.
Authors:

In females, the vagina opens as early as the 33.-42. Day on reaching a weight of about 100g. A week later, then begins the regular estrous cycle.

Schneider (2013)3)Schneider, M. (2013), Adolescence as a vulnerable period to alter rodent behavior, Cell and Tissue Research, Volume 354, Issue 1, pp 99–106 , the development was as follows:

To a comparable representation comes Hocharoen (2014)4)Hocharoen, C. (2014), Adolescent Exposure to CB1 Receptor Agonist Elicits a Disinhibited PFC State in Adulthood, Eukaryon, Vol. 10, March 2014, Lake Forest College:

Conclusion

Even though many sources report, that the sperm production only with the 45. of life begins, I would, in view of, that sexual maturity is very chain-dependent and is influenced by many factors, on the separation at the age of 32-35 Hold days.

References   [ + ]

1. Suckow, M. A. The Laboratory Rat
2. G. W. Robb, R. P. Amann and G. J. Killian (1972), Daily sperm production and epididymal sperm reserves of pubertal and adult rats, in Reproduction, Volume 54: Issue 1
3. Schneider, M. (2013), Adolescence as a vulnerable period to alter rodent behavior, Cell and Tissue Research, Volume 354, Issue 1, pp 99–106
4. Hocharoen, C. (2014), Adolescent Exposure to CB1 Receptor Agonist Elicits a Disinhibited PFC State in Adulthood, Eukaryon, Vol. 10, March 2014, Lake Forest College