6 



C1BCULAR 10 7, U. S. DEPARTMENT OF AGRICULTURE 



year ( r.'2!>) litters were received on two sable and fox farms; also a sable 

 gave birth to three young ones, whic h were successfully raised to maturity. It 

 is my personal opinion that investigations of sable fanning were promoted 

 by your marten-breeding experiments, and for that my countrymen are Indebted 

 to you. 



SUMMARY 



The normal breeding season in martens occurs during the summer 

 months, usually between the middle of .July and the third week in 

 August, and not during the winter months. 



From these experiments it has been definitely determined that the 

 gestation period ranges from approximately Sy> to 9 months (259 to 

 275 days); instead of 60 to 102 days as has been heretofore generally 

 accepted to be the case. 



