Calcium sources for Layers ?

I recently bought a 50# bag of calcium for my girls. I have always used oyster shells. My feed store got this in and it said on the bag for poultry so I'm trying it as they were out of oyster shells. Not sure what it is made up of and I took it out of the bag and put it in buckets with lids.
 
Here are some good food sources:

1. Spinach & Swiss Chard
2. Salmon & Sardines (canned with bones)
3. Mustard, Collard, Kale & Turnip greens
4. Shellfish
5. Blackstrap molasses (can cause runny stools)
6. Corn Tortillas
7. Yogurt
8. Mozzarella & Cheddar cheese
9. Milk, Buttermilk (goat's milk and cow's milk)
10. Basil, thyme, dill seed, cinnamon, and peppermint leaves
11. Romaine lettuce
12. Rhubarb
13. Almonds, Peanuts & Brazil Nuts
14. Black Beans, Dried Beans (Cooked)
15. Sesame seeds
16. Fennel
17. Cabbage, Bok Choy, & Chinese cabbage
18. Summer squash
19. Green beans
20. Garlic
21. Tofu & Soybeans
22. Brussel sprouts & Broccoli
23. Oranges (Some people do not feed citrus to chickens)
24. Asparagus & Okra
25. Crimini mushrooms
26. Foods Fortified with Calcium: Some Orange Juice, Breads, & Cereals

Imp
 
I always grind up their shells so they barely resemble shells (so they don't get any egg eating ideas) and it works great. I leave it in a seperate container that they can freely eat from. If you can grow alfalfa, it helps them retain a lot more calcium.
 
If you are going to feed egg shells, bake them in the oven first then crumble them. Yogurt is a good scource of calcium. Homemade is so easy. If you make your own add some nonfat dry milk to the milk before the culture is added. Boosts the calcium
 
I always grind up their shells so they barely resemble shells (so they don't get any egg eating ideas) and it works great. I leave it in a seperate container that they can freely eat from. If you can grow alfalfa, it helps them retain a lot more calcium.
What is the size of your grind up shells? What type grinder do you use? I understand it is important to have various size so the absorption of calcium I staggered!
 

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