Hormone levels linked to survival of deer calves, study suggests

Mar 27, 2014

Levels of a key hormone in the blood may be important for the survival prospects of newborn animals, a study of wild deer suggests.

First-born male that have relatively high levels of the male hormone testosterone are less likely to survive their first year compared with their peers, the research shows.

Scientists say their findings suggest that high represent a risk to newborns which, when coupled with a new mother's inexperience, lowers their chances of survival.

High levels of testosterone in adult male , including deer, are known to be linked to dominance and aggression. However, high testosterone is also associated with lowered immunity to infection and shortened lifespan.

Scientists from the Universities of Edinburgh and Cambridge measured testosterone in blood samples taken from 850 newborn wild red deer on the Isle of Rum between 1996 and 2012.

Their study could shed light on how testosterone levels affect the health and survival of young animals, an area of research which has not yet been widely studied.

The new findings also suggest testosterone levels in offspring are linked to their mother's condition. Male deer born in the years after an older brother had lower testosterone levels than other calves. Scientists are uncertain why this might be, but suggest it is because mothers are weakened by having male calves, which are heavier and suckle for longer than females.

Alyson Pavitt, from the University of Edinburgh's School of Biological Sciences, who led the study, said: "For adult animals such as red deer, high testosterone can increase strength and dominance but reduces immunity and longevity.

"This latest finding suggests that individuals born with high may be subject to similar costs."

The study, supported by the Natural Environment Research Council, was published in Functional Ecology.

Explore further: Self-employed men have higher levels of testosterone, study finds

add to favorites email to friend print save as pdf

Related Stories

Midrange testosterone levels better for older men

Jan 10, 2014

(Medical Xpress)—Optimal levels of testosterone - meaning neither low nor high - in older men are associated with better survival, according to a study recently published by a team of UWA researchers in ...

Recommended for you

GMO mosquito plan sparks outcry in Florida

18 hours ago

A British company's plan to unleash hordes of genetically modified mosquitoes in Florida to reduce the threat of dengue fever and other diseases has sparked an outcry from fearful residents.

Population genomics unveil seahorse domain

Jan 30, 2015

In a finding vital to effective species management, a team including City College of New York biologists has determined that the lined seahorse (Hippocampus erectus) is more a permanent resident of the we ...

Researchers develop new potato cultivar

Jan 30, 2015

Dakota Ruby is the name of a new potato cultivar developed by the NDSU potato breeding project and released by the North Dakota Agricultural Experiment Station. Dakota Ruby has bright red skin, stores well and is intended ...

Researchers develop new soybean variety

Jan 30, 2015

The North Dakota Agricultural Experiment Station has developed and released ND Henson, a conventional soybean variety, according to Rich Horsley, chair of the NDSU Department of Plant Sciences.

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

rockwolf1000
not rated yet Mar 27, 2014
Moose have calves.
Elk have calves.
Cows have calves.
Deer have fawns.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.