Sample sizes for LBS and parturition date for years 1972–2016.
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All numbers refer to females. Parturition date is measured repeatedly on individuals, whereas LBS is measured over a lifetime, and there is only one measure per individual. All females in the study population have an LBS record, including those that died as calves and therefore did not breed and do not have records for parturition date.
创建时间：
2019-11-05
