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Geneticists tell ostrich farmers the secrets of sex

Research published in the online journal, BMC Biotechnology reports on a new, large-scale technique for distinguishing between male and female ostrich chicks using DNA extracted from feathers. This new technique will remove the need for invasive procedures currently in use to sex-type ostriches and allow breeders to discover the sex of their chicks much earlier. Details of this new technique can now be read by all interested parties because of the decision of the authors to publish in the open access journal, BMC Biotechnology.

Although native to Africa, Ostriches are now farmed all over the world for their meat, feathers and hide. Ostriches, like many bird species, show few external differences between the sexes. In the 1960's a surgical technique was developed to tell male and female birds apart, which involved a small operation under anaesthetic. However, this procedure can result in bleeding and infection, as well as being stressful for the birds. In addition, ostrich chicks must be around three months old before their sex can be distinguished in this way.

For most birds genetic tests have largely replaced surgery as a means of determining the sex of a chick. However, genetic tests are usually based on differences between genes carried on sex chromosomes. Unfortunately, the sex chromosomes in ostriches are very similar making these sort of genetic tests useless. Whilst some new tests have been devised, they are not suitable for the large-scale analyses that are needed by commercial ostrich breeders.

To solve this problem, researchers from Brazil have devised a fast, large-scale technique, which can be used to sex-type ostriches from feathers. They used feathers rather than blood samples because it is more practical for farmers and less stressful for the birds to collect feather samples. The procedure involves a genetic technique known as the polymerase chain reaction (PCR) which can "amplify" fragments of DNA that are specific to male or
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Contact: Gordon Fletcher
gordon@biomedcentral.com
44-207-323-0323
BioMed Central
16-Oct-2002


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