It really depends on the rooster if he's experienced being handled for AI you can actually collect quite a bit more then a pea or droplet of water. Some of my experienced cochins used to being handled give quite a bit of semen when I collect, enough to AI more then one female. If he's young and not used to be handled most likely you won't get very much. Keep in mind it doesn't take much at all to get fertile eggs, if you can collect enough and in drops to insemenate the female that's all you need. Some of the old timers I've talked to use their thumb nail, it sounds gross but works for them, the point I'm trying to make is it doen't take much. As far as color, I've seen it both clear and with some yellow cast to it, from my experience the color has nothing to do with fertility. Keep in mind if it's very cold or really hot many times males aren't fertile. I've had some issues the last couple weeks due to temperature, it's been near zero at night and in the single digits to low teens during the day. Now the weather has taken a turn for the better things should pick up.
Shari