✦ LIBER ✦
A method for regulating the duration of pregnancy and the time of parturition in Sprague-Dawley rats (Charles River CD strain)
✍ Scribed by Anne D. Mayer; Jay S. Rosenblatt
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 92 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0012-1630
No coin nor oath required. For personal study only.
✦ Synopsis
A method of shifting the dark phase of the photoperiod cycle on Day 12/12 hr 7 of pregnancy is described for regulating the duration of pregnancy to 22 days and assuring that most parturitions take place between 1100 and This method, in addition, has the 1500 hr. added convenience that matings can occur during normal laboratory hours between 0700 and during the dark phase of the photoperiodic cycle. Litter sizes are normal (mostly 14-1900 hr 16 pups) and postpartum estrus behavior occurs at the normal interval of 4 to after 1 11 hr 2