Veterinarians work during an artificial insemination procedure on Ginni, an Asiatic lioness, at Prague Zoo, Czech Republic, January 3, 2019. REUTERS/David W Cerny 

Veterinarians work during an artificial insemination procedure on Ginni, an Asiatic lioness, at Prague Zoo, Czech Republic, January 3, 2019. REUTERS/David W Cerny 

A veterinarian prepares Ginni, an Asiatic lioness, for an artificial insemination procedure at Prague Zoo, Czech Republic, January 3, 2019. REUTERS/David W Cerny 

Veterinarians work during an artificial insemination procedure on Ginni, an Asiatic lioness, at Prague Zoo, Czech Republic, January 3, 2019. REUTERS/David W Cerny 

Veterinarians work during an artificial insemination procedure on Ginni, an Asiatic lioness, at Prague Zoo, Czech Republic, January 3, 2019. REUTERS/David W Cerny 

A veterinarian shoots a tranquilizer dart at Ginni, an Asiatic lioness, before an artificial insemination procedure at Prague Zoo, Czech Republic, January 3, 2019. REUTERS/David W Cerny 

Veterinarians prepare Ginni, an Asiatic lioness, for an artificial insemination procedure at Prague Zoo, Czech Republic, January 3, 2019. REUTERS/David W Cerny 

Veterinarians prepare Ginni, an Asiatic lioness, for an artificial insemination procedure at Prague Zoo, Czech Republic, January 3, 2019. REUTERS/David W Cerny 

A screen displays the microscopic image of an attempt to inseminate a dog egg at a lab of the biotech company Sinogene that specialises in dog cloning in Beijing, China June 15, 2018. Picture taken June 15, 2018. REUTERS/Thomas Peter 

Leber Li (R), 35, a restaurant owner, drives with Amely Chen, 35, and their son Mork, in Yilan, Taiwan, May 15, 2017. "It was our dream to have children. We have a child through artificial insemination, but only one of us can be registered to be the mother, while the other without a blood connection has no way to exercise the legal duty of being a parent. This is so unfair. The baby has the love of two mothers. It does not matter how a family is formed as long as there is love. The baby can face anything in the world if the love between us is strong," said Chen. REUTERS/Tyrone Siu SEARCH "SIU SAME SEX" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Mother giant panda Juxiao (top) picks up one of her triplets with her mouth inside their enclosure at Chimelong Safari Park in Guangzhou, Guangdong province, February 1, 2015. The triplets, which reached 6-month-old on Thursday, were the fourth set of giant panda triplets born with the help of artificial insemination procedures in China, and the birth is seen as a miracle due to the low reproduction rate of giant pandas, local media reported. REUTERS/Alex Lee (CHINA - Tags: ANIMALS SOCIETY) 

Giant panda triplets turn one-month-old at Chimelong Safari Park in Guangzhou, Guangdong province August 28, 2014. According to local media, they are the fourth set of giant panda triplets born with the help of artificial insemination procedures in China, and the birth is seen as a miracle due to the low reproduction rate of giant pandas. REUTERS/Alex Lee (CHINA - Tags: ANIMALS SOCIETY TPX IMAGES OF THE DAY) 

A newborn giant panda cub, one of the triplets which were born to giant panda Juxiao (not pictured), is seen inside an incubator at the Chimelong Safari Park in Guangzhou, Guangdong province August 12, 2014. According to local media, this is the fourth set of giant panda triplets born with the help of artificial insemination procedures in China, and the birth is seen as a miracle due to the low reproduction rate of giant pandas. REUTERS/Alex Lee (CHINA - Tags: ANIMALS SOCIETY) 

A newborn giant panda cub, one of the triplets which were born to giant panda Juxiao (not pictured), is seen inside an incubator at the Chimelong Safari Park in Guangzhou, Guangdong province August 12, 2014. According to local media, this is the fourth set of giant panda triplets born with the help of artificial insemination procedures in China, and the birth is seen as a miracle due to the low reproduction rate of giant pandas. REUTERS/Alex Lee (CHINA - Tags: ANIMALS SOCIETY) 

Tian Tian, the Edinburgh Zoo's female panda is seen in her enclosure in Edinburgh, Scotland April 15, 2014. Tian Tian was artificially inseminated on Sunday. REUTERS/Russell Cheyne (BRITAIN - Tags: ANIMALS POLITICS) 

Yang Guang, the Edinburgh Zoo's male panda is seen in his enclosure in Edinburgh, Scotland April 15, 2014. His partner Tian Tian was artificially inseminated on Sunday. REUTERS/Russell Cheyne (BRITAIN - Tags: ANIMALS POLITICS) 

Yang Guang, the Edinburgh Zoo's male panda is seen in his enclosure in Edinburgh, Scotland April 15, 2014. His partner Tian Tian was artificially inseminated on Sunday. REUTERS/Russell Cheyne (BRITAIN - Tags: ANIMALS POLITICS) 

Yang Guang, the Edinburgh Zoo's male panda is seen in his enclosure in Edinburgh, Scotland April 15, 2014. His partner Tian Tian was artificially inseminated on Sunday. REUTERS/Russell Cheyne (BRITAIN - Tags: ANIMALS POLITICS) 

Yang Guang, the Edinburgh Zoo's male panda is seen in his enclosure in Edinburgh, Scotland April 15, 2014. His partner Tian Tian was artificially inseminated on Sunday. REUTERS/Russell Cheyne (BRITAIN - Tags: ANIMALS POLITICS) 

Yang Guang, the Edinburgh Zoo's male panda is seen in his enclosure in Edinburgh, Scotland April 15, 2014. His partner Tian Tian was artificially inseminated on Sunday. REUTERS/Russell Cheyne (BRITAIN - Tags: ANIMALS POLITICS) 

Yang Guang, the Edinburgh Zoo's male panda is seen in his enclosure in Edinburgh, Scotland April 15, 2014. His partner Tian Tian was artificially inseminated on Sunday. REUTERS/Russell Cheyne (BRITAIN - Tags: ANIMALS POLITICS) 

Police detain an Orthodox activist in front of the Georgian Patriarchate in Tbilisi, January 8, 2014. Dozens of Orthodox activists confronted human rights activists protesting against Georgian Orthodox Patriarch Ilya II's views on surrogacy and artificial insemination he expressed in a written Christmas message, local media reported. REUTERS/David Mdzinarishvili (GEORGIA - Tags: CIVIL UNREST RELIGION CRIME LAW) 

Police detain an Orthodox activist in front of the Georgian Patriarchate in Tbilisi, January 8, 2014. Dozens of Orthodox activists confronted human rights activists protesting against Georgian Orthodox Patriarch Ilya II's views on surrogacy and artificial insemination he expressed in a written Christmas message, local media reported. REUTERS/David Mdzinarishvili (GEORGIA - Tags: CIVIL UNREST RELIGION CRIME LAW TPX IMAGES OF THE DAY) 

A demonstrator reacts as a police officer writes down her ID number during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilization, in Madrid July 22, 2013. REUTERS/Susana Vera (SPAIN - Tags: CIVIL UNREST HEALTH) 

A demonstrator carries a rainbow umbrella with a sign that reads "The church should pray, not legislate" during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilization, in Madrid July 22, 2013. REUTERS/Susana Vera (SPAIN - Tags: CIVIL UNREST HEALTH TPX IMAGES OF THE DAY) 

Demonstrators shout slogans during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilization, in Madrid July 22, 2013. REUTERS/Susana Vera (SPAIN - Tags: CIVIL UNREST HEALTH) 

A demonstrator holds a sign that reads "Maternity, free and desired" during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilization, in Madrid July 22, 2013. REUTERS/Susana Vera (SPAIN - Tags: CIVIL UNREST HEALTH) 

A man sleeps on a bench as demonstrators march during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilization, in Madrid July 22, 2013. REUTERS/Susana Vera (SPAIN - Tags: CIVIL UNREST HEALTH) 

A police officer writes down the ID of a demonstrator during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilization, in Madrid July 22, 2013. REUTERS/Susana Vera (SPAIN - Tags: CIVIL UNREST HEALTH) 

A police officer charges at a demonstrator during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilization, in Madrid July 22, 2013. REUTERS/Susana Vera (SPAIN - Tags: CIVIL UNREST HEALTH) 

Police officers detain a demonstrator during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilization, in Madrid July 22, 2013. REUTERS/Susana Vera (SPAIN - Tags: CIVIL UNREST HEALTH) 

Police officers detain a demonstrator during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilization, in Madrid July 22, 2013. REUTERS/Susana Vera (SPAIN - Tags: CIVIL UNREST HEALTH TPX IMAGES OF THE DAY) 

Breeding bulls stand in the barn of an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS) 

Austrian lab workers Ingrid (L) and Lambert check packed bull semen at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS) 

Austrian lab worker Lambert checks fresh bull semen at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS) 

Two breeding bulls wait at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS) 

Austrian bull keeper Johannes looks at Wille, a breeding bull, at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS) 

Austrian bull keepers Josef and Johannes (R) stand next to Wille, a breeding bull, at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS) 

Artificial vaginas are seen at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS) 

A breeding bull stands in the barn of an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Portions of semen, labeled with bulls' names, are seen in a container full of liquid nitrogen at an artificial insemination centre in the village of Hohenzell in Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Austrian lab worker Georg refills a semen container with liquid nitrogen at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Austrian lab worker Lambert checks a bull semen container at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Containers used to store bull semen are seen at an artificial insemination centre in Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Austrian veterinarian Franz shows fresh diluted semen of breeding bull Wille at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Austrian veterinarian Franz poses with a portion of sperm taken from a breeding bull at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Austrian veterinarian Franz takes sperm from a breeding bull at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Bull keepers Johannes, Peter, Wolfgang and Josef (L - R) look through a door at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Austrian veterinarian Franz takes sperm from a breeding bull at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS TPX IMAGES OF THE DAY)

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Austrian veterinarian Franz looks at Wille, a breeding bull, at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Austrian bull keeper Johannes looks at Wille, a breeding bull, at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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A breeding bull stands under infrared lights, used to relax his muscles, at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Artificial vaginas are seen at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS TPX IMAGES OF THE DAY)

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Austrian bull keeper, Johannes, walks with a breeding bull at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: AGRICULTURE ANIMALS BUSINESS)

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Austrian bull keeper Josef washes Wille, a breeding bull, at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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A breeding bull stands under infrared lights, used to relax his muscles, at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS TPX IMAGES OF THE DAY)

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An artificial insemination centre is seen through an artwork in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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A breeding bull stands in the barn of an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS TPX IMAGES OF THE DAY)

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Opponents of the same-sex marriage demonstrate against the government's draft law to legalise marriage and adoption for same-sex couples in Paris, November 18, 2012. France's Socialist government approved a draft law to allow same-sex marriage, saying the reform, under fire from religious leaders and conservative politicians, meant progress for the whole society. The law would grant gay couples the right to adopt children but not to use assisted procreation methods such as artificial insemination. Placard reads, " 1 Father, 1 Mother For All Children". REUTERS/Christian Hartmann (FRANCE - Tags: POLITICS SOCIETY CIVIL UNREST)