TDN Percentage of Cotton Seed Cake

Correct Answer: 80%

Cotton seed cake has a TDN of 80%, making it a high-energy protein concentrate.

Anti-Nutritional Factor in Cotton Seed Cake

Gossypol is the toxic anti-nutritional factor in cotton seed cake. It causes:

• Pink discoloration of egg white in poultry fed cottonseed meal
• Reduced fertility
• Liver damage

Treatment: Iron supplementation (FeSO₄) — iron binds gossypol and renders it non-toxic. Note: Horses are resistant to gossypol poisoning.

Comparison of Common Protein Concentrates

• GNC: DCP = 45%
• Cotton seed cake: TDN = 80%
• Soybean meal: Contains Kunitz trypsin inhibitor (destroyed by autoclaving)
• Fish meal: Not to exceed 10% in pig diet (fishy flavour in pork)