As many as what a breeder needs. Bulls don't produce semen that need to be collected like with cows that produce milk. A bull can fill thousands of straws per year if need be, depending on the demand for straws from that particular bull.
I need 100 straws.
8 straws.
18 straws.
15 straws are needed
To calculate the number of straws needed to make a rectangular prism, you would need to determine the dimensions of the prism (length, width, and height) in terms of the length of a single straw. Then, you would calculate the total number of straws required by multiplying the number of straws needed for each dimension. For example, if the prism is 10 straws long, 5 straws wide, and 3 straws high, you would need 10 x 5 x 3 = 150 straws.
Since one bull, on average, gives 7 ml of semen in an ejaculation, 14 x 0.5 ml straws or 28 x 0.25 ml straws can come from one ejaculation from a bull.
One unless the bull being used has poor quality semen.
There can be over a billion sperm in one 0.25 ml straw of bull semen.
anytime it wants
12 straws
Simple: Put bull behind cow. In all seriousness, you need a herd of females, preferably good breeders, and a good herd bull to put in with them. Then you just let the bull do his business. If you cannot use a bull, hire an Artificial Insemination technician, purchase a bunch of straws from one or more desired bulls (you should have twice or thrice as many straws as cows, just in case), and after timing the time when your females are in heat, get the AI tech to AI your females for you.
I need 100 straws.
8 straws.
6
They do not. This is a myth that has been dispelled many, many times by scientific fact and yet people still listen to the lies that media spills about what they think is in energy drinks. There are a couple of chemicals - primarily Taurine - that is found in both energy drinks and bull semen. But so is WATER, which isn't particularly newsworthy. All Taurine commercially used is synthetic. It comes out of a factory, not a bull.
18 straws.
There are dairy bulls. If the cow is not bred, she will not produce milk. Bulls are necessary to do this. Although, many cows are now artificially inseminated. Unless dairy heifers are needed to increase the herd or to replace cows that are too old, any bull's semen will do.