Limestone in Poultry Industry: Limestone is the most common source of calcium used in livestock feeding. The shell of each egg that hens are laying is made up of nearly 95% calcium carbonate by dry weight. To produce hard eggs, chickens will be consuming up 20 times the amount of calcium in one year than the amount of calcium that is contained in her actual bones. It is almost pure calcium carbonate. Calcitic limestone contains 36-38% calcium and can safely be fed free choice (ad lib) mixed with salt.
Magnesium also play very important role in poultry feed and hence limestone should have minimum possible Magnesium. We manufacture limestone grits and limestone powder that is high in Calcium (>38%) and very low in Magnesium (Mg <0.4%) that can be efficiently used as Poultry Feed / Cattle Feed.
High Calcium Limestone The egg shell consists of the inner and outer shell membranes, the true shell and the cuticle. The crystalline layer of the shell, which is responsible for its mechanical strength, consists of more than 90% calcium in the form of calcium carbonate . Limestone is a rich source of CaCO3 should be used as large particles (3-5 mm) and form of powder in poultry feed. Limestone so used, should be low in magnesium.
Low Magnesium Limestone it has been found that feeding excess magnesium reduced growth and bone development of broilers. Tibia ash was reduced in chicks fed 0.9% magnesium. Magnesium altered phosphorus metabolism and increased the dietary need for phosphorus. Laying hens fed high levels of dietary magnesium have shown varying responses of important variables, including egg production, feed consumption, and eggshell quality.