What is the recommended ratio of phosphorus to calcium in the diet of laying hens?

Question

BlackTom AI · Accepted Answer

The question asks about the recommended ratio of phosphorus to calcium in the diet of laying hens, and provides four options to evaluate.
Option 1: '1:2' implies phosphorus is half as much as calcium. In laying hens, calcium needs are high to support eggshell formation, so this ratio underestimates the calcium requirement relative to phosphorus. Consequently, this is not aligned with standard practice.
Option 2: '1:1' suggests equal parts phosphorus and calcium. While it reflects a balanced mineral intake in some contexts, laying hens require substantially more calcium than phosphorus to form strong eggshells, making this ratio inappropriate for their diets.
Option 3: '1:4' indicates phosphorus is one part for every four parts calcium. This mirrors the widely recommended calcium-to-phosphorus balance (Ca:P around 4:1) for layers, meaning phosphorus is low relative to calcium to support eggshell production and bone health. This configuration is consistent with established guidance.
Option 4: '2:1' would place more phosphorus than calcium, which can lead to inadequate calcium availability for shell formation and could impair shell quality and other calcium-dependent processes. This goes against the nutrition standards for laying hens.
In summary, options 1, 2, and 4 misrepresent the dietary balance needed to optimize eggshell quality and hen health, while option 3 correctly reflects the typical Ca:P emphasis used in layer diets.

ANSC20002_2025_SM2 Week 8 Quiz

What is the recommended ratio of phosphorus to calcium in the diet of laying hens?

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