Sex breeding

21 Feb

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In long-lived species, the age-, stage- and/or sex-dependent patterns of survival and reproduction determine the evolution of life history strategies, the shape of the reproductive value, and ultimately population dynamics.

However, recent studies on long-lived birds indicate a very late life senescence (e.g.

Mean female survival was 0.82 (95% CI: 0.74–0.88; Model 1, Table 2; Fig. In contrast, model selection for males retained a model in which males ≤7 yrs and males ≥8 yrs had different survival probabilities: 0.61 (95% CI: 0.39–0.79) vs.

They begin to show hair a few days after birth, and their eyes and ears are open by day 10.

Newborn rabbits are unable to regulate their own body temperature until about day 7. Most people raising rabbits for show or as pets rebreed 35 to 42 days after the birth of a litter.

In fact, among long-lived territorial species it is very difficult to achieve large sample sizes of known-age marked birds for long time periods (as that obtained for short lived and/or colonial species), which precludes an examination of how aging affects individual life-history strategies.

For this reason, potential sex-specific trade-offs between recruitment, breeding success and/or survival remain understudied.