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Oyster Shells and heavy metals

post #1 of 6
Thread Starter 

I'm new here, so please forgive me if this topic has already been covered.  I looked first but didn't see anything.

 

For many years, I have been reluctant to feed my chickens oyster shells because of where they come from.  That is, oysters come from bays and estuaries, which is also where heavy metals end up being deposited.  It's not that I've ever heard that oyster shells are laced with heavy metals, I just assume they are given the environment they live in.

 

I give ground granite for grit, but haven't found another source of calcium.  So I just feed a good laying mash and scratch grain.

 

Am I all wrong about oysters and heavy metals?  Does anyone know of another source for calcium? 

 

My birds always lay well and I've never had trouble with thin egg shells, so maybe it's a moot point. 

 

Thanks.

 

Capt.

post #2 of 6
Bone meal is another calcium option. I do not make it myself, it is hard work. But if you are worried, it is an option.
post #3 of 6
You need to check the source of the calcium in your layer ration, it might actually be from oyster shells. When fed mostly layer ration, hens won't actually need or eat much oyster shells. You could also feed them back their eggshells for extra calcium.
Chickens, muscovy ducks, turkeys, donkeys , goats, dogs, fish, parakeets, a parrot, and a cat.

Chickens and dogs are healing to the soul.

I brake for squirrels.

Some of my birds.
http://www.backyardchickens.com/a/my-wisconsin-flock
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Chickens, muscovy ducks, turkeys, donkeys , goats, dogs, fish, parakeets, a parrot, and a cat.

Chickens and dogs are healing to the soul.

I brake for squirrels.

Some of my birds.
http://www.backyardchickens.com/a/my-wisconsin-flock
Reply
post #4 of 6
My understanding is that shellfish are good bio-accumulators of heavy metals. Having said that I can only assume that oyster shells are a by-product of human consumption and they would not be harvested from sites high in pollution. Nothing to sweat imo.

Ct
Nairobi, Kenya
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Nairobi, Kenya
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post #5 of 6
Crushed limestone is another option and quite common it is actually used in alot of feed as the calcium supplement.
post #6 of 6

I've often wondered.....where does that crushed oyster shell come from??? <scratcheshead>

 

Is it a byproduct of oysters harvested for humans?

Where do those oysters come from....farmed or wild harvested?

What is in either environment that might remain in the shells?

 

Hard enough to pinpoint the sources of most human foods, let alone livestock/pet feeds.

Great article on VENTILATION, one of THE MOST IMPORTANT aspects of coop design.

Fantastic treatise to help decide how much SPACE your chickens need.

 

Chicken math is not just 'addition'...but also should include Division, Multiplication and especially Subtraction!!!

 

Quoting centrarchid:

"Make every effort to understand your chicken's biology and the environment that supports it."

Reply

Great article on VENTILATION, one of THE MOST IMPORTANT aspects of coop design.

Fantastic treatise to help decide how much SPACE your chickens need.

 

Chicken math is not just 'addition'...but also should include Division, Multiplication and especially Subtraction!!!

 

Quoting centrarchid:

"Make every effort to understand your chicken's biology and the environment that supports it."

Reply
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