QUOTE(robbieb @ May 9 2006, 10:04 AM) [snapback]1181373[/snapback]
i have been to that site often it has good info but it also explains how a cross uis very unlikly
As far as i can tell from reading a little about this subject, even when this big cat's are cross bred in zoo's most are still born or often have some kind of genetic desease(cerebellar hypoplasia) ( hip dysplasia) (patella luxation) (cranial deformities) the same thing's happen in domesticated cat's.
PROS
CONS
INBREEDING
(Mating of closely related individuals)
Produces uniform or predictable offspring.
Hidden (recessive) genes show up and can be eliminated.
Individuals will "breed true" and are "pure."
Doubles up good genes.
Eliminates unwanted traits.
Doubles up on faults and weaknesses.
Progressive loss of vigor and immune response.
Increased reproductive failures, fewer offspring.
Emphasis on appearance means accidental loss of "good" genes for other attributes.
Genetically impoverished individuals.
LINE-BREEDING
(Mating of less closely related individuals)
Avoid inbreeding of very closely-related cats, but cats are still "pure".
Produces uniform or predictable offspring.
Slows genetic impoverishment.
Require excellent individuals.
Does not halt genetic impoverishment, only slows it down.
OUTCROSSING (Mating of unrelated individuals within the same breed)
Brings in new qualities or reintroduces lost qualities.
Increases vigor.
Cats are still "pure".
Less consistency and predictability of offspring.
May have to breed out unwanted genes accidentally introduced at same time.
May be hard to find individuals which are true outcrosses.
HYBRIDIZATION (Mating of unrelated individuals of different breeds)
Brings in new qualities or reintroduces lost qualities.
Increases vigor, may improve immune system and reproductive capacity.
Introduces totally new traits e.g. color. Fur type.
May result in new breeds.
The offspring are considered "impure" for many generations.
Unpredictable - new traits may not all be desirable.
Must choose outcross breed whose qualities complement or match own breed.
May take years to eliminate unwanted traits/loss of type.
May take years to get consistent offspring.
Produces many variants not suitable for use in breeding program.
Copyright 1996, 2001, 2003 Sarah Hartwell