Topics:
Animal Nutrition, Animal Refresher
Amino Acids Deficient in Collagen
Collagen is deficient in:
- Cysteine
- Tryptophan
- Both a & b — Correct Answer
- Lysine
Explanation:
Correct Answer: Both Cysteine & Tryptophan
Despite being abundant in animal by-products (gelatin, meat meal), Collagen is an incomplete protein because it is severely deficient in two essential amino acids: Tryptophan (essentially absent) and the sulphur-containing amino acid Cysteine.
Collagen — Completeness as Protein Source
| Feature | Detail |
|---|---|
| Richest amino acid | Glycine (~35% of residues) |
| Deficient in | Tryptophan & Cysteine — incomplete protein |
| Sulphur-containing AAs | Methionine, Cysteine, Homocysteine, Taurine |
Sulphur in Nutrition — Key Facts
- Sulphur-containing vitamins: Thiamine & Biotin
- Sulphur-containing amino acids: Methionine, Cysteine, Homocysteine, Taurine
- Sulphur-containing hormones: Insulin, ADH/Vasopressin, Oxytocin
- Wool contains 4% sulphur; Human hair keratin contains 14% sulphur
- Recommended N:S ratio in ruminant diet = 10:1
📚 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.
