I have ordered mice several times from Harlan and the P1 all breed great and give tons of babies. But I have had little to no luck getting the F1 ones to breed. Each time we have bought surplus CD-1 mice and have only a couple groups of F1 animals reproducing. We have allowed the F1's to get good size about 5 weeks before separating them from the adults. Then we have let them grow out about 8 weeks for the females and 6 weeks for the males before placing them into breeding groups.
Just wondering if there is a trick to these guys.
Any advice would be great!
Thank you,
Nick
