| |
|
| |
| Parent 1 |
|
Parent 2 |
|
Progeny |
SS
(suri type) |
x |
SS
(suri type) |
= |
SS
(always suri) |
ss
(huacaya type) |
x |
ss
(huacaya type) |
= |
ss
(always huacaya) |
SS
(suri type) |
x |
ss
(huacaya type) |
= |
100% Ss (suri)
(haplotype)
|
Ss
(suri type) |
x |
Ss
(suri type) |
= |
25% SS (suri)
50% Ss (suri)
25% ss (huacaya)
|
SS
(suri type) |
x |
Ss
(suri type) |
= |
50% SS (suri)
50 % Ss (suri)
|
Ss
(suri type) |
x |
ss
(huacaya type) |
= |
50% Ss (suri)
50% ss (huacaya)
|
|
 |
|
Table 1: Alpaca phenotypes
resulting from Suri/Huacaya mating. |
"I have bred both Huacaya and Suris from early days in the importation of
both types and have been crossing Huacaya and Suri alpaca for four years.
Before we began this project, the information available
from South America did not confirm any simple mode of inheritance,
and so we were surprised when our crossings produced very
large numbers of Suri.
Our next surprise was that the Suri outcome of a Huacaya/Suri
cross was indistinquishable from the so called pure Suri
from South America and the Huacaya outcome of such a cross
was indistinquishable from other normally bred Huacayas.
There was no evidence of intermediate types.
Our findings were no different from those observed over
a range of farms.
The Suri gene is dominant. Where the Suri gene and the
Huacaya genes are present in the same animal, then the
animal will be phenotypically, that is to say in every
outward appearance, a Suri.
A Huacaya phenotype occurs only when two sets [recessive]
Huacaya genes are present. For practical purposes this
works like a single gene pair in the way outlined below.
In the table above, I have used
S = dominant Suri Gene and
s=[recessive] Huacaya gene, to try to
make the inheriance clear.
SS = genetically Suri
ss = genetically Huacaya
Ss = genetic haplogype, but because
the S gene is dominant, this gives a
phenotype identical to the Suri [SS].
What are the implications of this?
It is not difficult to produce Suris. A Suri stud male
mated to any group of Huacaya females will drop about 50%
suri (or 100% if the male is SS).
Probably very few of the Suris in Australia are pure SS
type. Nevertheless it will not be difficult to breed pure
SS suris. (Mating Suri type will result in one quarter
of the offspring being pure Suri, one quarter being pure
Huacaya, and the remaining half will be Suri in appearance
but of mixed genetics. To cause a rapid drift toward the
pure Suri line one simply removes the Huacayas into the
Huacaya herd. After a number of generations the Suri line
will be almost pure Suri).
Any Huacaya (types) produced out of matings of either
Suri with Suri, or Suri with Huacaya are pure Huacaya and
can be accepted on an equal footing with other Huacayas
and bred with them."
* phenotypes resulting from Huacaya
by Huacaya, Suri by Huacaya, and Suri by Suri Alpaca
crossing. R W Ponzini, D J Hubbard, R V Kenyon, C D Tuckwell,
B A McGregor, Andrea Howes, L Carmicheal, and G J Jusdon.
|