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One thing you might try- especially if your birds are free ranging- is cut the amount of protein you're feeding a little bit; nitrogen and potassium interfere with calcium metabolism. Adding a magnesium source (food quality dolomite lime) may also aid in calcification. I've gotten the same advice whether dealing with puppies, lizards, cattle or humans: the chemical pathways are the same.
Vitamin C and Vitamin D also help with the absorbtion of calcium. Someone on the forums posted several weeks ago that they got a vit D supplement at the feedstore and it greatly helped.
Here are some other sources of calcium
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
You forgot the best sourch of calcium, which is South Bend, WA......the Oyster Capitol of the WORLD!!!!!!!!!!
There is mountains of crush shell out here !
And Long Time No See Imp!!!!!!!!