Penguin-Like Squat Posture in Hens
'Penguin-like squat' posture in hens is due to deficiency of which vitamin?
- Vitamin A
- Vitamin C
- Vitamin D3 — Correct Answer
- Vitamin E
Correct Answer: Vitamin D3
Vitamin D3 (Cholecalciferol) deficiency in hens causes the characteristic 'penguin-like squat' posture due to severe bone demineralisation and softening of bones, making the bird unable to maintain normal posture.
Vitamin D3 Deficiency Diseases by Species
- Children: Rickets (soft, deformed bones — bow legs, rachitic rosary)
- Adults: Osteomalacia (softening of bones)
- Hens: Penguin-like squat posture, soft-shelled eggs, reduced egg production
Vitamin D Metabolism
Vitamin D acts as a hormone. It is synthesised in the skin on exposure to sunlight (UV radiation converts 7-dehydrocholesterol → Vitamin D3). Its precursor is cholesterol. It promotes calcium absorption through the GIT.
Why Hay is Rich in Vitamin D
Sun-drying of forage during hay-making causes conversion of ergosterol to Vitamin D2 — so hay is an excellent source of Vitamin D.
📚 About this Topic — Animal Nutrition
This multiple choice question is from Animal Nutrition, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Nutrition to strengthen your preparation.
