This all depends on the breed. Three-month-old calves of different breeding will weigh more or less than the other. For instance, a Charolais calf will weigh more than a Jersey calf, or a miniature Angus calf will weigh less than an Angus calf (one that is normal in size and proportion).
Usually around 600 lbs.
Yes, if that's what it takes to save the calf!
That cross does NOT produce a blue calf. This cross will give a GREY or smokey-grey calf, never blue. The resulting cross would simply be called a Char-Angus cross or Angus-Char or Angus-Charolais cross.
The length of lactation in an Angus cow is for as long as she has her calf on her, which is around 6 to 10 months.
Depends on its age and sex. Older calves weigh more than younger calves; male calves weigh more than heifer calves. Average birth weight is around 60 to 80 lbs.
Around 300 lbs.
Genetics. The genes in the momma cow combine with the genes from the calf's sire to create a calf with either the same colouration of the cow or not. What breed the calf's sire matters to. For instance, a Hereford sire bred to an Angus cow results in a black-baldy calf. Or, an Angus cow that has a recessive gene for Red colour and is bred to either a Red Angus bull or a Black Angus bull also with a heterozygous gene for the red gene can most likely produce a red calf. And the examples go on.
260 LBS
You can either buy one--off a local producer who sells such calves or from your local salebarn--or you can get one yourself by breeding an Angus cow with a Hereford bull (or a Hereford cow with an Angus bull). Even breeding a modern-type Simmental cow with an Angus bull (or vice versa) will get you a black-baldy calf.
LOL, this is one of those jokes that many cattlemen like to toss around when they see an Angus cow acting as serogate mother to a Charolais calf. But in all seriousness, no, there is no such thing as a White Angus.
A yearling Angus steer should weigh around 800 lbs.