right now im expeirmenting with the calif.XNZ. using a calf. buck. the pure Calf. are a waste of time and money. they need crossing to get up to size in a decent amount of time. my crosses were 2 wks ohead of the pure calf. in weight, and the calf. were 5 days older. Al my purebred Cali's weigh between 8 and 10 pounds... and they are all still under a year... They definitely AREN'T a waste of time.