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Ca requirement of laying hens for the production of eggs for market with optimum shell strength. The effect of higher Ca contents in feed on shell strength, estimated by 3 different methods



Ca requirement of laying hens for the production of eggs for market with optimum shell strength. The effect of higher Ca contents in feed on shell strength, estimated by 3 different methods



Meded. Landbouwhogesch. Gent. 29: 1253-1275



For 21 weeks up to 1 year of age 7 groups of 20 pullets reared on a diet with 3% Ca were given diets with 1.2 to 3.5% Ca, supplying 2035 kcal productive energy per kg and equal in protein and total and inorganic P. The diets had different amounts of soya bean meal, oats and animal fat, and fodder chalk from 1.5 to 7.55%. For best egg production at least 2.25% Ca was needed. Shell strength continued to increase with Ca up to 3.5%.

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