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Kakariki, Care, Breeding, Ecology, and Conservation :: View topic - Hybrids and the future of aviculture
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Hybrids and the future of aviculture

 
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Peter
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Joined: Oct 15, 2004
Posts: 599

PostPosted: Mon Apr 29, 2013 3:52 am    Post subject: Hybrids and the future of aviculture

Interesting link. I'm sure it will change your view on hybrids.
http://cityparrots.org/journal/2013/4/17/hybrids-and-the-future-of-aviculture.html
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Steptoe
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Joined: Oct 06, 2004
Posts: 4550

PostPosted: Mon Apr 29, 2013 9:53 am    Post subject:

From the link
Quote:
Relations between parrots, especially among many of the South American groups are even more tight then those of people and apes. Because their limited genetic distance a moderate amount of hybridisation between these species with sufficient back-crossing would make little or no impact on the genetic make-up of the species.

And in captive, the ablity to cross those gentic lines, over and over exists , attifacally way beyond nature... Nature then tends to dilute that species cross very quickly, or the off spring as in mules , is infertile.
So this doesnt justify hybridization in captivity.

Quote:
Are aviculturist actually preserving species? From conservation breeding science we know that to maintain most of the genetic material in a captive setting we need about 500 founders. That is 500 random birds from the original population contributing their offspring to the breeding program. This will preserve about 90% of the total genetic diversity of the original population.

The reality of aviculture however is that few, if any parrot species in aviculture can boasts having 500 founders and those that have certainly where not selected randomly.

Well species like the NZ black robin from 1 pair are doing well...rather 1 extreme example.. but there are many others ... it comes back to nature looking after its self, culling weak defective birds before they can breed, something responsible breeders without dollars for eye balls do anyway.

Quote:
On the Chatham Islands the endemic Forbes' parakeet Cyanoramphus forbesi hybridises with the introduced red-crowned parakeet C. novaezelandiae. Measures of the immune function, not surprisingly, were found to be markedly higher in the more cosmopolitan red-crowned parakeet than in the island endemic Forbes' parakeet. The 2006 study however also found that back-crosses that mostly resembled the Forbes' parakeet in phenotype, retained much of the immune function of the red-crowned parakeet. In the discussion the research team suggests that modest hybridisation could help those endangered species that experience immune problems to obtain the genes they need to fight disease


One will find the Forbes has developed the dease resistance for its envoriment, and the red crown for its environment... and if the study taken further to include red crown from very diffrent parts of the main lands those to will have different characteristics...
A very limited intial reaserch and then the exploated way out beyond the scope of the intial reseach...
One the other hand in this modern world of new deases being introduced into new environments, there is a argument to intoduce a red crown into a well populated flock of different species...but as the red crown gene gets diluted back to next to zero % does the deases resistant gene also get diluted.
But way introduce a full blooded species and not a hybrid of as 10% of the introduced species into a flock?

It makes no change to my stand of not crossing species, but rather increases that stand.....
On the other hand very limited introduction (already very diluted hybrid) of an other species gene to increase something like dease resistance, in a very controlled environment, yes that I do have on the table for now... and this is for conservation reason , not general captive breeding ...[/quote]

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