Cloning Issues/risks

By cloning animals we could arrive to the issues/risks it might have on humans.
1. The success rate ranges from 0.1 percent to 3, foe the following resons:
*The enucleated egg and the transferred nucleus may not be compatible
*An egg with a newly transferred nucleus may not begin to divide or develop properly
*Implantation of the embryo into the surrogate mother might fail
*The pregnancy itself might fail

2. cloned offsprins that sevives are uswaly much bigger than their natural counterparts. That can lead to breathing, blood flow and other problems.

3. 'As cells divide, their chromosomes get shorter. This is because the DNA sequences at both ends of a chromosome, called telomeres, shrink in length every time the DNA is copied. The older the animal is, the shorter its telomeres will be, because the cells have divided many, many times. This is a natural part of aging.
So, what happens to the clone if its transferred nucleus is already pretty old? Will the shortened telomeres affect its development or lifespan?
When scientists looked at the telomere lengths of cloned animals, they found no clear answers. Chromosomes from cloned cattle or mice had longer telomeres than normal. These cells showed other signs of youth and seemed to have an extended lifespan compared with cells from a naturally conceived cow. On the other hand, Dolly the sheep's chromosomes had shorter telomere lengths than normal. This means that Dolly's cells were aging faster than the cells from a normal sheep.
To date, scientists aren't sure why cloned animals show differences in telomere length.' from genetic scence learning centre

- and other issues/riskes