There
are 3 basic techniques in livestock selective breeding, they
are: Inbreeding, Linebreeding and Outcrossing.
In a nutshell:
Inbreeding:
where brother-sister, child-parent are bred to one another.
Inbreeding enhances desired traits but on the other hand, the undesired
traits could also be enhanced. While breeders may be able to
breed out physical undesirable traits by careful selective
breeding, genetic problems like immunity to diseases, lifespan
and fertility may not be easy to sieve out.
Linebreeding: A
milder form of inbreeding where related bloodline, e.g.
cousins are bred together. With a broader but somewhat
related gene spectrum, the aim is to maximize the advantage of enhancing the
desirable traits while minimizing the risks of inherent
genetic problems.
Outcrossing: The
direct contrast of inbreeding where 2 unrelated bloodlines are
bred together. The result is like a shuffled stacked of cards where
the outcome is much less predictable. One reason to outcross is
to bring in certain desired traits into the original
bloodline. However, desired traits may be bred out and the
breeder will need to cross back to the original line in order
to bring it back again. At a certain juncture, no
breeder can avoid outcrossing to create more hybrid vigour into
the original strain.
With
the aim to create a new hybrid of buffalo head sakura Singachu, we
closely tracked 3 different combinations of Singachus with
a known lineage of sakura ranchu. As expected, very few specimens
suitable for future breeding were derived. It
is also interesting to study the features of the 3 lines brought
about by different combinations of parent fishes. The future
breeding plan will be to use the 3 lines to cross amongst each other
(linebreeding).
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1 |
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Line
2 |
Line3 |
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3
months old |
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