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In conclusion , feeding aged laying hens with diets containing increasing concentrations of Mg up to 3 . 0 g / kg improves eggshell strength , but has no detrimental effects on laying performance .
 Chemical: Mg
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Mg