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Seven Test Tube Puppies Make In-Vitro Fertilization a Boon for Dogs Too!

by Reshma Anand on December 10, 2015 at 5:30 PM
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Seven Test Tube Puppies Make In-Vitro Fertilization a Boon for Dogs Too!

In-vitro fertilization has turned to be a boon not only for humans but also for animals. In a breakthrough experiment, seven puppies were born through IVF by the rigorous efforts of scientists at the Cornell University and the Smithsonian Conservation Biology Institute (SCBI).

Five proven breeder male dogs (two Labrador retrievers, one beagle, and two cocker spaniels), aged 2-10 years, were used as semen donors. The semen was transferred into the host female dog which gave birth to seven healthy puppies (5 beagles and 2 beagle-cocker spaniel mixes).

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But the technique was very tiring for the researchers as they faced several challenges during this process. The first challenge was collecting the mature eggs from the female oviduct. The second was to prepare similar fertilization conditions in the lab and the third was freezing of the embryos.

Dogs reproduce only once or twice a year and therefore magnesium was added to the sperm's storage medium. They also found that IVF works best when the eggs reached maturity on the sixth day.
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"The seven healthy puppies born as a result of this work represent hope for their endangered counterparts. At SCBI, we collect and freeze ovarian tissue and sperm when genetically valuable individuals die. Now we are one step closer to applying in vitro technologies to endangered canids, which should ensure their survival even while the populations continue to decline in the wild," noted study co-author Nucharin Songsasen.

Reference: Jennifer B. Nagashima, Skylar R. Sylvester et al. Live Births from Domestic Dog (Canis familiaris) Embryos Produced by In Vitro Fertilization, PLOS ONE, December 9, 2015, DOI: 10.1371/journal.pone.0143930

Source: Medindia
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