Can't help with the questions about the breeding, but maybe can add some insight to the noisiness... A friend of mine who is an RSPCA inspector always maintained that the noisy animals were the ones that the RSPCA didn't have to worry about, as those were the ones that were used to being fed on a regular basis. Those that didn't make noise were those who had given up asking for food, and were therefore being silent as being noisy never resulted in the outcome that they hoped for - i.e. food. With my own animals (fed once a day), this is reflected, as the noise level increases significantly when it is feeding time - during the day, I can go in with them, do jobs in the sheds, fields etc with barely a murmur, however, later in the day, when they are expecting food, my face looks remarkably like a bucket full of food.
That's all I have to add.
Catherine.