List any two characteristic signs/symptoms of the following deficiency diseases:

a. Vitamin D3deficiency in layers

b. Manganese deficiency in chicks

c. Calcium deficiency in layers

d. Vitamin B2deficiency in chicks

e. Selenium deficiency in chicks

a. Vitamin D3deficiency in layers -

• Decreased egg product ion
• Poor hatchability
• Thin shelled/shell-less eggs
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