At very low densities, all females were able to breed but after the saturation of breeding territories the breeding rate dropped, and breeding of excess animals was suppressed (Point S in Figure 1A, parameterised for our empirical system in Figure 1B at ~3 females per enclosure).
Emperor penguins are able to breed at around three years of age, and usually commence breeding around one to three years later.
Most sheep have a breeding season (tupping) in the autumn, though some are able to breed year-round.
It could also be that during the better food year in 2006/07, poorer quality or less experienced birds may have been able to breed than in 2005/06, when low food availability precluded all but the best individuals from breeding.
The fish would be bred female and sterile, though a very small percentage might still be able to breed.
If you can't find another member of your species, it's handy to be able to breed with yourself.
The project will take two years, Dr. Lerche said, but in the end Davis will be able to breed enough monkeys to share with other centers.
Reproducing only with each other, scientists will soon become so genetically isolated that they'll no longer be able to breed with other humans.
Fabian social reformers such as Sidney and Beatrice Webb were delighted to think that they would be able to breed a better working class.
