The new Feed Efficiency (FE) value rewards cattle with the ability to produce large volumes of milk without having to consume a great deal of feed, based on the following formula:
Feed Efficiency = (Dollar value of milk produced) - (Feed costs for extra milk) - (Extra maintenance costs)
The new Fertility Index (FI) combines several reproductive components into one overall index: ability to conceive as a maiden heifer, ability to conceive as a lactating cow, and a cow's overall ability to start cycling again, show heat, conceive, and maintain a pregnancy. The Fertility Index is derived from the formula:
Fertility Index =
18% Heifer Conception Rate (HCR)
+ 18% Cow Conception Rate (CCR)
+ 64% Daughter Pregnancy Rate (DPR)
Breeding cows based on the updated TPI formula results in more profit, efficiency, and fertility. It impacts dairy producers' bottom lines today, while the genetic superiority expressed by these cows will be passed onto the next generation.