My advice is just take a deep breath and relax if getting it done via vaginal ultrasound. Sorry if this TMI for any of you, but imagine the vaginal wand as if it were like your significant other putting himself in you.
The runner duck, the Cayuga, the blue Swedish and the buff duck are among the top layer ducks, averaging up to 180 eggs per year. Poor egg layers such as the mallard may lay as few as 60 eggs a year. Some specialized varieties such as the white layer duck can produce nearly 300 eggs a year.
Most birds in the wild are seasonal layers. Chickens used to be wild and only laid one clutch per season. Through selective breeding, humans have created chickens which will layer upwards of 300 eggs per year. People have also bred ducks that will outlay a commercial egg-laying chicken.