Interbirth interval

The length of time between successive births of the same female(s). Often this is directly inversely correlated to the number of litters per year but this is not always the case (e.g. it will not be for species with multiple fixed birth seasons in seasonal environments).

The data must be qualified according to whether the interval follows a successful or unsuccesful litter using the Interbirth Interval Definition field. If this information is not recorded then select ‘Unspecified’ from the ‘IBI Defn’ list.

Generic value types: Data Value, Data Range, Measure, Sample Size, Captivity Status, Units and Source Type.