It depends on what breed of beef cattle you are asking about.
Bison cows primarily give birth to one calf a year.
A Pied calf may weigh around 100 lbs at birth.
A young bison or buffalo is called a calf
A calf.
There could very well be. Charolais are notorious for siring large calves, and as such this could prove to be a really big problem for a bison momma. Bison are naturally adapted to give birth to small calves and to give birth quickly. If the bison cow cannot give birth to such a large calf, then she will be in serious trouble.
40 pound
A reasonable range is 80-100# at birth.
calf
Calf. The same terms that apply to cattle generally apply to bison.
Around 50 to 60 lbs.
They are referred to as 'calves'. Or singular 'calf's. I hope this helped.
On average, a Brown Swiss calf can weigh between 80-90 lbs.