20d • Rabbit Nutrition
Let's talk calcium and pregnancy.
Just a heads up to everyone running rabbits right now.
The alfalfa crop coming out of Texas (fall 2025) has been testing low in both mineral density and protein efficiency. That matters more than people think. If that crop made it into pellet production, your bag may not actually be delivering what the tag says on paper.
And we’re starting to see it.
What I’m seeing — and what others are reporting — lines up:
• more brittle bones
• increased fractures
• does struggling to kindle
• more straining in labor
• poor milk production
• DOA kits or underdeveloped kits
• late-term losses or does dumping litters in the third week
Because of this, and because I’ve now seen it in more than one doe, I’ve started supplementing calcium in the water during the last week of pregnancy through the first 5 weeks of nursing.
Mix and dosage are at the end.
This is now being added into Class 5 of the nutrition course, but I’m putting it here because this is one of those moments where waiting costs litters.
What Calcium Is Actually Doing in a Rabbit
Calcium in rabbits gets reduced to “sludge” conversations way too often, and that misses the entire point.
Calcium is not a side mineral. It is a structural, metabolic, and reproductive driver.
Rabbits are built to absorb calcium efficiently and use it continuously. Their entire system assumes it will be available.
When it’s not, things don’t degrade slowly. They fail across multiple systems.
Growth — Building the Frame
Calcium is what builds the rabbit.
It drives:
• bone formation
• tooth development (which never stops in rabbits)
• structural growth
When calcium is inadequate, you don’t just get “slower growth.” You get:
• weaker frames
• poor bone density
• dental problems
• long-term structural compromise
You are not raising a smaller rabbit. You are raising a weaker one.
Bone — Maintenance, Not Just Growth
Bone in rabbits is constantly being remodeled.
Calcium is moving in and out of storage all the time to support:
• muscle contraction
• nerve signaling
• metabolic stability
If intake doesn’t meet demand, the body pulls from bone.
That leads to:
• fragility
• fractures
• dental disease
This is why calcium is a lifelong requirement, not just something for young animals.
Pregnancy — Building Multiple Bodies at Once
A pregnant doe is building entire skeletons.
Calcium demand increases significantly because she is supplying:
• her own metabolism
• fetal skeletal development
If calcium is short:
• kits may develop poorly
• the doe begins pulling from her own reserves
• metabolic stress increases
Pregnancy is not passive. It is a heavy mineral drain.
Kindling — Calcium Is Part of the Mechanism
This is where people really underestimate it.
Calcium is required for muscle contraction signaling.
That includes uterine contractions.
If calcium balance is off, you can see:
• weak contractions
• prolonged labor
• straining
• incomplete kindling
This is not theoretical. This is mechanical failure at the cellular level.
Lactation — Peak Demand
Lactation is one of the highest calcium-demand states a rabbit will ever be in.
Rabbit milk is extremely dense and supports rapid kit growth.
That calcium has to come from somewhere.
If it’s not in the diet:
• milk production drops
• kits fail to thrive
• the doe pulls from her own skeleton
Do that repeatedly, and you start to break down your breeding stock.
Neuromuscular Function — Movement Depends on It
Every movement a rabbit makes depends on calcium.
It drives:
• muscle contraction
• nerve transmission
When calcium balance is disrupted:
• weakness shows up
• coordination drops
• severe cases can look like neurological failure
This is why mineral issues can look like “something else” entirely.
What This Means Right Now
If your base feed is coming in lower than expected — and right now, it likely is in some cases — the rabbits don’t just “adjust.”
They pull from themselves.
And the first place you’ll see it is:
• reproduction
• bone strength
• milk production
• kit viability
Exactly what we’re seeing.
Calcium is not something to restrict out of fear.
It is something to manage correctly, especially when your base inputs aren’t reliable.
Rabbits are designed to:
• absorb calcium efficiently
• use it continuously
• dump excess through the kidneys
But that system only works if there is enough coming in.
Right now, in some feeds, there isn’t.
What I’m Doing
Because I’ve seen enough of a pattern to act on it, I’ve started:
Supplementing calcium in the water • last week of pregnancy
• through first 5 weeks of nursing
This is not a blanket recommendation for all situations.
This is a response to a specific observed deficiency pattern.
Mix & Dosage
What I am currently using is a mineral solution to support does during late pregnancy and early lactation.
Base Mix
Use:
• 12 oz bottle of water
(harder plastic works better so you can actually shake it properly)
Add:
• Calcium
4000+ mg total
– use chalky calcium tablets (Equate is fine)
– typically 5–6 tablets at 600 mg each
– break or crush into powder for better mixing
• Magnesium
1 capsule (~500 mg)
– open capsule and dump powder in
• Vitamin C
1 tablet (~1000 mg)
– crush or break up
Mixing
Put everything into the bottle and shake aggressively until dissolved.
It will not fully dissolve — expect sediment. That’s normal. Shake before each use.
Water Dosing
Add:
• 1–2 fluid ounces of the mix per water bowl
Refresh daily. Shake the bottle before pouring so you’re not just dosing water and leaving the minerals behind.
Direct Support (When Needed)
If a doe is actively in labor and struggling (and you have ruled out a physically stuck kit):
You can give:
• ~1 cc orally (slurry form)
You can make a thicker slurry from the same mix for this purpose.
This is meant as support, not a substitute for proper assessment.
Important Notes
This is not meant as a permanent base diet change.
This is a targeted intervention during:
• last week of pregnancy
• early lactation (first ~5 weeks)
Also:
• sediment is normal
• shake before every use
• do not assume all kindling issues are mineral-related — rule out mechanical causes first
Final Note
If you’re seeing:
• more straining during kindling
• weaker litters
• increased DOA kits
• does not milking well
Don’t just assume bad luck.
Start looking at your mineral intake.
Because right now, that’s where the problem is showing up first.
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Let's talk calcium and pregnancy.
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