Animal Incest

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now reading: What's Wrong with Animal Incest?
I don't know about where you're from, but in Minnesota, dolphins are a pretty big deal. It might have something to do with how far we need to travel in order to see dolphins in the wild. Or it might just be that dolphins are really cool. Either way, you can imagine that when the Minnesota Zoo announced on Monday that our dolphins will be leaving for good, it was kind of a big deal.

The fuss was amplified by the fact that the Minnesota state government recently allocated $4 million to the zoo in order to refurbish the dolphin tank. In response to the uproar, the zoo's CEO, Lee Ehmke, later released a statement providing further explanation as to why the current dolphins have to leave and why there are no dolphins available to replace them.


Photo by my dolphin-loving friend Jenna


preferentially breeding wild caught ("founder") animals to capture as
much of their genetic (allelic) variation as possible," Willis told me. "We are also
preventing the breeding of relatives using contraception and
relocation."

As Willis explained, the Consortium's strategy involves loaning dolphins between zoos. That way
every dolphin can be fit to a good social situation and can be bred to a
genetically compatible mate. In fact, the two dolphins currently living at the Minnesota Zoo, Semo and Allie, aren't actually owned by that zoo.

While considerations of genetic variation didn't
directly impact the MN Zoo's decision to send Semo and Allie away,
genetic variation has impacted the zoo's past decisions.

A few
years ago, the MN Zoo relocated the only dolphin they actually own, a
female named Spree, to keep her from mating with her own dad. "She was on contraceptives so that she and Semo
(her sire) would not produce an offspring, but of course we did want
her to produce offspring. We moved her to a facility so that she could
live with other females and not be with her sire," said Willis.

I think we all realize there are many reasons why incest is not a good habit for humans, but what exactly would be wrong with Spree getting together with Semo?

Willis explained that it comes down to heterozygosity, which is genetic variation at the individual level. "Inbreeding,
the mating of related animals, results in a decrease in the
heterozygosity of the offspring relative to the parents. That decrease
in heterozygosity can lead to an increased incidence of congenital
anomalies and poor health."

Heterozygosity often influences a zoo's decisions when breeding captive animals of all kinds. Unfortunately, some zoos intentionally breed relatives in order to produce offspring with rare features. White tigers, for instance, are so rare that they can only be produced through incest. As a result, many of these would-be majestic cats are born with less-than-regal deformities such crossed vision and facial deformities. Thankfully, in June 2011, the Association of Zoos and Aquariums published an official statement cracking down on this twisted practice.

Incest can even be a problem in wild animal populations, especially when meddling humans are involved. In Australia, Tasmanian devil populations have taken a dive due to a facial tumor disease. By hunting devils and killing them as pests, humans effectively exterminated a large chunk of the devils' genetic diversity.

The remaining devils were forced to inbreed, which gave them very similar immunological genes, leaving them open to the facial tumor disease. The disease is passed between devils through biting and is almost always fatal.

Moral of the story: no one, including animals, should breed with their relatives. 


"I look just like my mama/sister!"

Photo by Menna Jones via Wikimedia Commons

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By Rachel Quigley 20:00 BST 04 Dec 2012 , updated 20:00 BST 04 Dec 2012
A 20-year-old mother was arrested after she confessed to her boyfriend she enjoyed - and had been engaging in - sex with her dogs since she was 13-years-old and often fantasized about incest.
Brittany Angelique Sonnier, 20, is accused of committing 'vaginal and oral sex with two canines' in Lake Havasu City, Arizona, and has been charged with two counts of crimes against nature.
She had originally been charged with bestiality.
The police were alerted to the alleged animal sex by Sonnier's boyfriend, who has not been named.
He said he was worried about her 11-month-old son, feared she may be addicted to sex and need help and believed she turned to animal sex at 13 because she could not get a partner at that age.
According to the police report, the man had been in a six-month relationship with Sonnier, who he thought was a 'nice, sweet and innocent girl', and thought everything was going really well.
During the summer, problems started to arise and their sex life started to suffer, he said. It was during this time she came home from work one day and told him they needed to 'talk'.
'They sat down and Brittany used his phone to look some things up,' the police report states. 'He expected Brittany to ask if they could have a threesome or if he wanted to be a swinging couple. He would have been fine with either of those things - he is very open.
'Instead, Brittany started to show him pictures of people having sex with animals. She told him that she was interested and into having sex with dogs. She went on to tell him that she has been having sex with their family dogs since she was 13 years old.'
He told police that she claimed to have both 'vaginal and oral sex' with the dogs. He did not know what type but called them 'medium sized' and said one was 13-years-old and the other just a couple of years old.
Speaking about her interest in incest, she showed him images on her phone of family cartoon characters having sex.
The ex-boyfriend told police he was 'disturbed and freaked out' and said he told Sonnier 'she was disgusting.' The two broke up shortly after, according to the Huffington Post.
Before calling police, he thought he would broach it with the girl's father who revealed he knew about the dog sex and said he was trying to gain custody of her 11-month-old son because he felt his daughter was not a good parent.
The boyfriend also revealed the 20-year-old may be pregnant with his child as she had stopped taking her birth control pills and had displayed signs of being pregnant, though she refused to take the test.
He also believes she intends to become a prostitute because 'in the past she told him she is good at sex and enjoys doing it and feels like she should get paid for it'.
The police report adds: 'She will have sex with anyone anywhere, at any time because she is an addict.'
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Mother, 20, 'told boyfriend she has been having sex with her dogs since she was 13 and often fantasizes about incest'
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