Week 7

Dairy: Lactating Cows

Fats and Oils

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Adding Fats to Rations

• Common diets contain 2 to 3% fat
• Why add fat?
  • Intake limiting factor - 2.25x greater than CHO
  • Replace highly fermentable CHO
    • 1 lb ground corn = 0.88 Mcal NEL
    • 1 lb animal/vegetable fat = 2.65 Mcal NEL
• Too much impairs fiber digestion
  • Reduced feed intake

Problems with Fat

• Unsaturated fats depress fiber digestion more severely than saturated fats
• Saturated fats less digestible than unsaturated fats

Milk Response to Added Fat

Total UFA Values for Fat Sources

How Much Fat to Add?

• 2 to 3% DM naturally in diet
• 3% DM from unprotected sources
  • Whole oil seeds
  • Animal/vegetable fats
• 1 to 2% DM from protected sources
  • Megalac
  • Energy Booster