The smaller the dwarf rabbit, the higher the cuteness factor. But it is a lethal gene that dwarfs these little pint-sized bunnies.
If you’re a breeder of dwarf bunnies, or simply interested in knowing more about tiny rabbits, you’ll want to understand how the DWARF gene works, and how to manage your breeding program in order to maximize the numbers of true dwarf rabbits.
Let’s see how dominance versus recessive rabbit genetics principles apply to the DWARF gene.
The principles of dominant and recessive inheritance are the same for the dwarf gene as for other genes such as rabbit coat color genetics.
If you need a refresher on the basics of rabbit genetics, click here. The information will open in a new window so you can come back to this page as soon as you like.
The dwarf gene works as a simple dominant gene. This means that just one dwarfing gene will produce a dwarf rabbit. If you’re thinking ahead of me, you’ll already be formulating the following questions in your mind:
Every rabbit has two size genes, along with the many gene duplicates for fur color, eye color, etc. Each sire and dam will pass on one of their size genes to each offspring, which will re-combine to make two per offspring.
Since the dwarf gene is dominant, just one dwarf gene will produce a dwarf rabbit. But this dwarf gene is also deadly, if paired with a second dwarf gene. Without a normal gene as a recessive back-up, a rabbit who inherits two copies of the dwarf gene always dies.
Here are the combinations of SIZE genes that any rabbit could receive:
What do these combinations look like in real rabbits?
two-dwarf-gene combination is always fatal. The reasons for this are unclear, but it is
thought that the double dwarfs have digestive and brain insufficiencies. If not stillborn, they usually last only 1-3 days past birth, but a
few have lasted up to 3 weeks, and a tiny percentage to 4 weeks.
Peanuts are excessively tiny. The little guy pictured here managed to live 2 weeks, which is actually quite rare, and died the day after this picture was taken. (Pictures used by permission of Roseline Bunnies)
If you’re breeding any of the dwarf breeds, now you know why those ultra-tiny kits in your nestbox died. Breeders of the dwarf breeds deal with peanuts as a regular part of breeding.
These are the animals that you want in your
litters. True dwarfs are animals that
match the standard of perfection for their dwarf breeds.
If the true dwarf is a Netherland Dwarf rabbit, it is round, short, and compact. The ears are short, and the feet are correct.
The true dwarf Holland Lop is tiny but massive, with correct proportions for its standard of perfection. The same is true for other breeds that carry the dwarf gene.
He does not carry a dwarf gene at all. But for most dwarfed breeds it’s not like you’ll get a twelve-pound rabbit.
Because the Netherland Dwarf rabbit is little to start with, the false dwarf is just a little bigger than normal. His ears will be a tad longer than normal, his body will be longer and gangly, and the feet will be longer. In fact, the Netherland Dwarf rabbit and Holland Lop breeders have a term for their false-dwarfs - "big uglies."
Most BUB's - big ugly bucks - are sold as pets. These false dwarfs are still very cute of course. But, if the BUB is very promising in many ways other than size, the option is open to keep the buck as part of your breeding program, for use with a true dwarf doe.
Similarly, dwarf breeders frequently consider keeping the BUD - big ugly doe - as a brood doe, if her body type is promising (not counting the extra size). Because remember, ideal dwarf rabbits have ONE dwarf gene and ONE normal gene. The BUD will contribute that normal gene to 100% of her offspring.
Remember that gene match-ups are totally random,
luck-of-the-draw, a coin-toss. In one
litter, there’s no telling what combinations you might get of true dwarfs,
false dwarfs and lethal peanuts in one litter.
But over many litters, the odds even out.
If you breed together two true dwarfs you’ll end up with:
(Below: Picture kindly supplied
by The Nature Trail)
If you breed a true dwarf buck to a ‘big ugly doe’
(false dwarf), you’ll end up with:
So whether you use does that are true dwarfs or false dwarfs, if bred to a true dwarf buck, you’ll end up with 50% true dwarfs.
There could be a few advantages to using a BUD as a dam:
On the other hand, you'll need a true dwarf doe in order to test whether your buck is a true dwarf or a false one (it's not always so easy to tell). Any peanuts in the litter PROVES the existence of a dwarf gene in both sire and dam, because both contributed a dwarf gene to the peanut.
In this picture of newborn Holland Lop dwarf rabbits, the
two small bunnies on the left are peanuts.
There's nothing wrong with using an outstanding true dwarf
doe for breeding purposes. Just be
prepared to find a peanut or two in your litters. Some dwarf breeders cull the peanuts when
they find them, and some wait until they expire on their own. If you choose to wait, do check the nest
every day so you can remove them once they die.
This keeps the nest clean from decay, odor and flies.
These breeds carry a DWARF gene:
I didn’t list the Polish rabbit or the Britannia Petite above, because technically, these miniature breeds are not ‘dwarfed.’
True Britannia Petites have been selectively bred for their tiny size - 2 1/2 pounds as an adult. (Max 3 1/2 pounds for Polish rabbits.) However, according to the American Britannia Petite Rabbit Society, most Britannia Petite bloodlines in the USA have been ‘corrupted’ with genes from Netherland Dwarfs in order to obtain a desired color gene. Along with the varied colors, the dwarf gene comes along for the ride unless the breeder specifically test-breeds and then eliminates the gene from the herd gene pool. Breeders of some "brit" bloodlines now find peanuts in their litters.
The same may also be true of some Polish rabbit lines.
All is not lost, however. Breeders can still test-breed, discover those individual rabbits that carry the dwarf gene, and remove them from their breeding program.
See Autosomal Recessive Disorders for tips on test-breeding.
It takes time and dedication, but the rewards are great!
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