In the past couple of weeks, my doe's milk has been tasting bad. In Storeys Guide to Raising Dairy Goats, it says milk can have a bad flavor if you milk too fast, resulting in the milk foaming. How many pulses/squirts do you a minute? The book say it is best to do about 66 per minute and I used to do it about 160-180 a min. What could be the cause?