My father (b. 1917central NY) would use the word milch cow occasionally and could give it either pronunciation /ts/ or affricate. But it's very old-fashioned, 'dairy cow' would be the more common term today. In the old days of course, people used to just have a single cow. I'd find it hard to imagine applying the term 'dairy cow' to one of these loners. Dale Coye The College of NJ