"Srinivas S"  wrote in message
>
> I hear about cloning of sheep,mice,frog,horse and even humans. Why > is
the technique not used for rare/endangered species to increase their
> number?
>
You need to manipulate a very large number of eggs to get a few surviving
clones. Also, you need a female of the right species for each one you
implant, and in rare species females are in short supply
>
> In any case would this not be better than leaving it to chance
> reproduction.
>
It's probably better to allow the animals to mate normally, and have each
child a mixture of genes from its parents.
>
> Are there practical or theoretical problems in cloning tigers or
> cheetahs?
>
I think you might be confusing cloning with a related technology, which
transfers an embryo from one female to a host. This is used quite a bit to
breed elite cattle.
There have been attempts to transfer, say, tiger embryos to lioness hosts.
However I don't think that any have survived to maturity.
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