Ok I did some Googling of Albino Moose. More than likely these are just a white color phase. True Albinos will have the pink pigmentless eyes.
The chances of an true Albino appear to be 1:100,000. The white phase moose are more likely to be seen with chances at 1:10,000.
As far as the white cows only having brown calves. Not necessarily true. I found a few pics of a white mother and calf. Pretty interesting topic to read about.
Here are just a few of the pics I found on Google.