Only females are considered in this life-table. However, there is no problem to include male populations into the life table. Then, survival rates should be specified separately for males and females, and the sex ratio of offspring should be taken into account. They show, at what age death rates are high and low. This means that survival rate is independent of age.
Humans have a similar shape of survivorship curve.
Consider N new-born sheep. R 0 is the average number of female offspring produced in the entire group of N sheep. It means that an ewe produces 2.513 ewe lambs in average in a lifetime. It means that the average age of mothers when they give birth to an eve lamb is 5.1 years. Generation time can be adjusted by subtracting half of age step.