Ebenezer said:First bull is high milk and the second bull will have daughters with lower milk. That is the driver on $E. The daughters of the first bull will need more groceries. There was an article in Progressive Cattleman a few months ago with research that said that even if your feed and forage are not able to let a cow express her full potential of milk production that the cows with the higher MM EPDs will be harder doing. The article said it in a better way but the take home for me was to know the MM EPD that you can support and stay close.
Learned something, thanks!Ebenezer said:HP is based on heifers breeding and not lactating cows breeding. So for the most part: no.
There could be a correlation of slow breeding heifers due to increased organ sizes needed to support more milk production when they are in lactation but that has not been proven as far as I know. HP is merely virgin heifers breeding or not breeding. It could be due to genetics that are low fertility, slower maturity pattern, more genetic growth to negate energy to reproduction, lack of environmental fit (such as able to handle the heat), ...