I have not tasted it.
The boar has a ‘pouch’ inside the skin pouch hiding his dick, and therein assembles old skin remnants and bacteriae and that give a boar his distinctive scent - well many would say quite smelly. At the farms where they collects the sperm, they start with cleaning him, before he mount the ‘sow’.
According to the thread “Animal semen FAQ” the boar sperm tastes almost like human :
“Unusual corkscrew penis with a screw that runs in clockwise direction. Starting with a fingertip near the base of the corkscrew and the tip pointing towards you, moving the finger around in a clockwise direction will lead to the tip. Sheath contains an internal pocket called a preputial sac that collects foul-smelling smegma, and must be cleaned out prior to collection to avoid contamination and foul odors.
Semen is voluminous and has a thick, gel like component, although the part containing the sperm itself is quite thin. The first squirts of semen is thick and strong gamey tasting. The tapioca pearl-like gel at the end of ejaculation has little flavor to it. The rest of the semen is similar to a human's. An entire boar ejaculate contains about an entire day's worth of zinc.
Matings last up to 15 minutes and involve several ejaculations and rests without withdrawal. Pressure must be exerted to the tip of the penis in order to sustain ejaculation. That can be done by squeezing the tip between the thumb and pointer fingers.
Young boars should be taught how to have their semen collected and shouldn't be taught how to mount, otherwise they can become dangerous. If they become used to mounting, they will not be able to achieve orgasm any other way, and can become very frustrated if they are not relieved daily. This can be an issue when they grow up and weigh twice as heavy (or more) than an average person.”