HOUSING SYSTEMS BIOSECURITY HOUSING & BROODING EARLY MANAGEMENT LIGHTING NUTRITION HEALTH HATCHING EGG MANAGEMENT 69 69 LOHMANN › MANAGEMENT GUIDE 5–10 WEEKS: FRAME DEVELOPMENT NUTRIENTS To maintain a highly reproductive hen, adequate skeletal development during the preparation period is important. Consider the levels of calcium, phosphorus, vitamin D, and the contributions of phytase (if it is incorporated into the diet) to ensure an adequate and balanced supply of each of them in each phase. It is recommended to maintain the balance between calcium and phosphorus, based on the proportion found in hydroxyapatite, the bone structure. Practically, we can consider a ratio of 2.1 Ca / available P or 2.2 Ca / digestible P. However, these ratios can be influenced by the consumption and availability of minerals. The nutrient level of this feeding phase will again be conditioned by management and environmental factors that will significantly influence the pullets’ consumption. With a lower-than-expected consumption, we will inevitably have to increase nutrient levels in feed, especially the level of protein/digestible amino acids. But it’s not always the best solution.
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