Over the past couple of weeks had one calf born dead and three that lasted 2-4 days. The three that were born alive were very weak. The biggest 50 pounds while the lightest was around 30 pounds. Tried to feed them, but it was not meant to be. The kicker....they were all AI'd to the same bull. The three cows were PB Simmental. Had one heifer calve that was bred to a different bull, that calf was born around 65 pounds that had no issues and is doing fine.