It represents the total number of live births per woman, in terms of fertility by age in the observed year, ignoring mortality until the end of the
fertile period. To ensure simple reproduction, fertility rates should be at a level of 2.1 children per woman.
This was timed to coincide with the interval between the previous brood fledging and the onset of the females' subsequent
fertile period. However, we had a few instances where the nestlings had not yet fledged and the disturbance caused them to fledge prematurely.
The analysis of phenotypic trends of the selection experiment after 7 generations of selection showed a positive trend for phenotypic values of F (6.38 in G10 versus 5.59 eggs in G4 of selected synthetic strain), with correlated response for increasing H (5.73 vs 4.86 ducklings) and maximum duration of the
fertile period (7.91 vs 6.84 days), without increasing the embryo mortality rate (0.65 dead embryos in G10 vs 0.73 dead embryos in G4) (Table 2).
Why were the 1990s such a
fertile period for indies?
We hypothesize that male 1 and male 2 provided parental care to this brood because both attempted to copulate with the female during her
fertile period. During 20032011 breeding seasons, feeding behavior of adults to nestlings has been observed for [greater than or equal to] 25 min every 1-2 days for 409 nests, with no prior observations of cooperative breeding.
To answer these questions they simulated an increased risk of adulterous behaviour in female reed warblers by briefly introducing a caged extra male to 31 reed warbler pairs during the female's
fertile period.
OvuSense is a fertility monitor that accurately identifies and predicts a woman's
fertile period to help couples trying to conceive.
Looking backward from the fraught politics of Bangladesh today, one is struck by the incredibly
fertile period of democratic activity that took place in the 1930s and 1940s.
Egyptian Ala'a Negm says he puts the
fertile period down to the change in weather.
* It is necessary to conquer the imbalance in the age structure of the population through an increase of the birth rate, decline in mortality (reducing the mortality with children, reducing the mortality with mothers), conquering the migration processes (reducing the emigration of young people and women in their
fertile period);
In nonmonogamous species such as gorillas, males may benefit from killing other males' babies because losing a baby forces the mother to enter her
fertile period sooner.