Egg layer peaks contain 3.5% (4 grams per day) of calcium and 0.40% of available phosphorus. After the peak of egg production, with the age of the chicken, each day requires 4.1.4.4 grams of calcium and 0.330.42 grams of available phosphorus. From the beginning to the end of the laying period, more than one-third of the calcium in the feed must be supplied in the form of large particles (3.5 mm), such as limestone or shellfish.
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