It all depends on the breed, the genetics of that calf, the health of the calf, and the quality/type of feed you're feeding it. Thus it could take anywhere from three months to eight to get a calf to be at that target weight.
If they had enough in a pack to bring one down, and were hungry enough, yes. Coyotes that are alone won't bring down a calf themselves. But if there are more than one, like 2 or 4 in a group, then they could definitely bring down a calf. Most cases of calf killings are not by coyotes, but by feral dogs or wolves.
A baby narwhal weigh's about 300-400 pounds
About 400 pages. You need to read it anyway, then you truly get the basics of evolutionary theory.
According to vetrinary encyclopedias it can take from 9 days to 200 day for a flea egg to hatch. In reference to the actual life span, I'm assuming you are wondering how long the egg is viable.
400 kg
Such a generic term can lead to very skewed calculations as to how much grain is needed to raise a calf to the lucky number 400 lbs. What if that calf is already at 400 lbs and the questioner doesn't even know it? Breed, age, current weight, type of grain being fed and if there is other feed being fed (i.e., hay, silage, grass) are all things that must be known first and foremost before this question can possibly be answered.
The two differential diagnoses that come to mind are calf diptheria or chronic pneumonia. However, your veterinarian will have to take a look at the calf to see what may be going on.
400 what?
400 days 400 nights
400 years
400 hours
400 divide by 60 walla
It would take about 400 hits on the barrel
500
Depending on the variety it can take anywhere from 90-110 days give or take.
About 400 years
400 YEARS.... !