Hamster_database

Data concerning crossing dates and number of offspring used to assess sex ratio. Data are in 7 columns: 1. cross number: in the form "BB.BB1" Letters represent species ( B=P. campbelli, S=P. sungorus ). The first two letters are the mother's species, the second two letters are the father's species. Further, each unique litter is given a number. 2. mother.number: mother's unique identification number. 3. father.number: father's unique identification number. 4. birthdate: when the litter was born. 5. female.number: number of female offspring in the litter. 6. male.number: number of male offspring in the litter. 7. total.litter.number: sum of males and females in the litte