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There are many factors that influence the eggshell color. We add the method of eggshell color from the following introduction: 1. Increase 1%-3% blood meal has certain help to increase in chicken eggshell color formula, there may be relationship between iron and blood hemoglobin. 2. We know eggshell components: calcium: 38%: 0.2%; total phosphorus; salt: 0.02%: 8.24ppm; zinc; copper: 20.1ppm; 196 ...