F1 (first cross)
This alpaca should be the offspring of a homozygous suri male over a huacaya female.
If a heterozygous suri is used, out of 4 offspring 3 will be suri in appearance and the other one will be born huacaya.
In addition, two out of every three suri produced will be like their parents, heterozygous, they will carry the huacaya gene which they will pass on to future generations. Only one in every four progeny produced from such a mating will be a homozygous suri which can be guaranteed to breed true suri type.

Some coloured suri stud males imported, mainly from Peru, have been confirmed as heterozygous.  Meaning they will produce a percentage of huacaya progeny. For some reason which can only be explained as “money before improvement” or “it is from overseas it must be good” some Australian breeders continue to use these males thinking that they are improving their suri herd. They are not - by continuing with this breeding stratgey they are actually continuing continuing to dilute the suri gene. Australian suri breeders need to become more ruthless with their breeding program and work towards using only homozygous males if crossing.

F2 (second cross) can still be called a F1
The result of mating a hetrozygous over a hetrozygous female.

BC1 (a first back cross)
The offspring of a homozygous suri male over a F1 female.

BC2 (a second back cross)
The offspring of a homozygous suri male over a BC1 female.

BC3 (a third back cross)
The offspring of a homozygous suri male over a BC2 female.

Suri
A full suri with no known huacaya within the last 3 generations.

Heterozygous Male
If a heterozygous male is used in a breeding program it is incorrect to describe the offspring as BC1, BC2 etc as the huacaya gene is being reintroduced not eliminated.

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