Supplements for Beef CowsSupplements for Beef Cows• Example forage analysis

Nutrient %DM 88.0Crude protein 8.5NDF 65.0ADF 36.0

Supplements for Beef CowsSupplements for Beef Cows• Estimate DM intake• DMI, %BW = (120/%NDF)• DMI, %BW = (120/65) = 1.85% BW• 1,200 lb cow x 0.0185 = 22.2 lb DMI

Supplements for Beef CowsSupplements for Beef Cows• Estimate CP intake• 22.2 lb DMI x 0.085 = 1.89 lb CP

Supplements for Beef CowsSupplements for Beef Cows• Estimate TDN intake• TDN, % = 88.9 – (0.779 x %ADF)• TDN, % = 88.9 – (0.779 x 36)• TDN, % = 60.9%• 22.2 lb DMI x 0.609 = 13.5 lb TDN

intake

Supplements for Beef CowsSupplements for Beef Cows• Are requirements being met?• Late gestation requirements

CP TDNLate gestation

2.0 lb12.6 lb

Estimated intake1.89 lb 13.5 lb

Difference -0.11 lb

0.9 lb

Supplements for Beef CowsSupplements for Beef Cows• Are requirements being met?• Lactation – superior requirements

CP TDNLactation – superior 2.9

lb15.7 lb

Estimated intake1.89 lb 13.5 lb

Difference -1.01 lb

-2.2 lb

Supplements for Beef CowsSupplements for Beef Cows• Do I need a protein or energy

supplement?• Both contain CP and energy• Difference is relative concentration of

CP

Supplements for Beef CowsSupplements for Beef Cows• Protein supplements usually have

25% CP or higher• Energy supplements usually have less

than 15% CP• Calculate first limiting nutrient

Late GestationLate Gestation• CP supplied/CP required• 1.89 lb/2.0 lb = 0.95 or 95%• TDN supplied/TDN required• 13.5 lb/12.6 lb = 1.07 or 107%• First limiting nutrient is CP

Late GestationLate Gestation• CP needed = 0.11 lb• Corn gluten feed–22% CP, 80% TDN

• 0.11 lb/0.22 = 0.5 lb corn gluten feed

Lactation – SuperiorLactation – Superior• CP supplied/CP required• 1.89 lb/2.9 lb = 0.65 or 65%• TDN supplied/TDN required• 13.5 lb/15.7 lb = 0.86 or 86%• First limiting nutrient is CP

Lactation – SuperiorLactation – Superior• CP needed = 1.01 lb• Corn gluten feed–22% CP, 80% TDN

• 1.01 lb/0.22 = 4.6 lb corn gluten feed• 4.6 lb x 0.80 = 3.7 lb TDN added