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Related Experiment Video

Updated: Jul 15, 2026

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

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Gestation length in red deer: genetically determined or environmentally controlled?

¹AgResearch, Ltd, Invermay Agricultural Centre, Private Bag 50034, Mosgiel, New Zealand. geoff.asher@agresearch.co.nz

Society of Reproduction and Fertility Supplement

|May 12, 2007

Summary

Red deer gestation length is more variable than previously thought, influenced by nutrition and social factors, not just genetics. This variability helps optimize birth weight and synchrony in red deer (Cervus elaphus) populations.

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Area of Science:

Zoology
Reproductive Biology
Animal Ecology

Background:

Red deer (Cervus elaphus) exhibit seasonal breeding with historically documented gestation lengths of approximately 233-234 days.
Recent observations suggest greater variability in red deer gestation length than previously recognized.
Environmental and social factors may influence pregnancy duration in this species.

Purpose of the Study:

To investigate the variability of gestation length in European red deer (Cervus elaphus).
To explore the influence of nutrition and social factors on red deer gestation and parturition timing.
To challenge the notion of a genetically fixed gestation period in red deer.

Main Methods:

Analysis of historical gestation data for red deer.
Experimental manipulation of nutrition levels in late pregnancy for red deer hinds.
Comparative study of gestation lengths in primiparous versus adult red deer hinds.

Main Results:

Nutritional variations in late pregnancy affected fetal growth and gestation length without altering birth weight in red deer.
Primiparous red deer hinds displayed significantly wider gestation length variation (193-263 days) compared to adults (228-243 days).
Earlier conceiving primiparous hinds had longer gestations, leading to synchronized calving within the cohort.

Conclusions:

Red deer gestation length is not rigidly fixed and is influenced by environmental factors like nutrition.
Social cues may play a role in regulating parturition timing to promote birth synchrony in red deer.
The findings challenge traditional assumptions about fixed gestation periods in wild ruminants, suggesting potential parallels in other non-domesticated species.